JP6895831B2 - Superconducting cyclotron - Google Patents

Description

The present invention relates to a superconducting cyclotron.

Conventionally, for example, Patent Document 1 is known as a technique in such a field. The superconducting cyclotron described in Patent Document 1 includes a vacuum vessel, a superconducting coil arranged inside the vacuum vessel, and a coil support for supporting the superconducting coil. In this superconducting cyclotron, the vacuum vessel can be slid with respect to the yoke according to the contraction of the superconducting coil.

Japanese Unexamined Patent Publication No. 2013-258382

Here, in the superconducting cyclotron, the position may be adjusted to align the center position of the superconducting coil. When adjusting the position of the superconducting coil in this way, it is required to move only the superconducting coil and the coil support, unlike the case where the superconducting coil contracts. When the vacuum vessel is slid like the above-mentioned superconducting cyclotron for adjusting the position of the superconducting coil, the vacuum may be broken.

An object of the present invention is to provide a superconducting cyclotron capable of appropriately adjusting the position of a superconducting coil.

The superconducting cyclotron according to the present invention is a superconducting cyclotron that accelerates charged particles and emits charged particle beams, and is a superconducting coil wound around a winding central axis and a coil support that supports the superconducting coil. The coil support is provided with a vacuum container for accommodating the superconducting coil and the coil support inside, and a load support for supporting the coil support in the vacuum container in the first direction in which the winding central axis extends. It is slidable with the load support and has a low friction portion formed on at least one surface of the load support.

The superconducting cyclotron according to the present invention includes a load support that supports the coil support in the vacuum vessel in the first direction in which the winding central axis extends. In such a structure, the coil support and the load support can slide with each other. Therefore, the position of the superconducting coil supported by the coil support can be changed in the vacuum vessel, so that the position can be adjusted. Further, a low friction portion subjected to low friction treatment is formed on at least one surface of the coil support and the load support. Therefore, when the position of the superconducting coil is adjusted in the vacuum vessel, the coil support supporting the superconducting coil can slide smoothly with respect to the load support. This facilitates the position adjustment of the superconducting coil. From the above, the position of the superconducting coil can be adjusted appropriately.

In the superconducting cyclotron, a gap may be formed between the coil support and the load support in the second direction orthogonal to the first direction. As a result, a sufficient stroke for sliding can be secured between the coil support and the load support.

The superconducting cyclotron according to the present invention is a superconducting cyclotron that accelerates charged particles and emits charged particle beams, and is a superconducting coil wound around a winding central axis and a coil support that supports the superconducting coil. The coil support is provided with a vacuum container for accommodating the superconducting coil and the coil support inside, and a load support for supporting the coil support in the vacuum container in the first direction in which the winding central axis extends. The load supports are in contact with each other to transmit the load and enable relative movement with each other.

The superconducting cyclotron according to the present invention includes a load support that supports the coil support in the vacuum vessel in the first direction in which the winding central axis extends. In such a structure, the coil support and the load support are in contact with each other to transmit the load and enable relative movement with each other. Therefore, the superconducting coil supported by the coil support can change its position in the vacuum vessel while the load is supported by the contact with the load support, so that the position can be adjusted. From the above, the position of the superconducting coil can be adjusted appropriately.

According to the present invention, it is possible to provide a superconducting cyclotron capable of appropriately adjusting the position of the superconducting coil.

It is sectional drawing which shows the cross section which cut the superconducting cyclotron of one Embodiment of this invention in the direction along the central axis of a superconducting coil. It is sectional drawing which shows the cross section which cut the cyclotron in the direction orthogonal to the central axis of a superconducting coil. It is a perspective view which shows the horizontal load support. It is sectional drawing which shows the horizontal load support. It is a side view which shows the horizontal load support. It is an enlarged sectional view which shows the connection structure. It is an enlarged cross-sectional view which shows the operation of the connection structure. It is an enlarged cross-sectional view which shows the operation of the connection structure. It is an enlarged cross-sectional view which shows the connection structure which concerns on the modification. It is an enlarged cross-sectional view which shows the connection structure which concerns on the modification.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same parts or corresponding parts are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 1, the superconducting cyclotron 1 according to the present embodiment supplies charged particles from an ion source (not shown) into the acceleration space G, and accelerates the charged particles in the acceleration space G to charge the charged particles. It is a horizontal circular accelerator that outputs a beam. Examples of charged particles include protons and heavy particles (heavy ions). The superconducting cyclotron 1 is used, for example, as an accelerator for charged particle beam therapy.

Since this superconducting cyclotron 1 continuously accelerates a charged particle beam that draws a circular orbit in the acceleration space G, it is isochronous (the time required for one round is the same regardless of the size of the radius of the circular orbit). It is necessary to control the magnetic flux density so as to secure it.

The superconducting cyclotron 1 includes a superconducting electromagnet 5 in addition to an ion source. The superconducting electromagnet 5 has poles 3 and 4, a yoke 6, superconducting coils 7 and 8, a coil support frame (coil support) 9, and a vacuum vessel 10.

The poles 3 and 4 are arranged apart from each other in the C direction of the central axis of the superconducting coils 7 and 8 (the winding central axis of the superconducting coils 7 and 8). In the superconducting cyclotron 1, the central axis C direction is arranged along the vertical direction. Therefore, in the present embodiment, the "first direction" in the claims may be referred to as the "central axis C direction" or the "vertical direction". Further, the "second direction orthogonal to the first direction" may be referred to as a "horizontal direction". The pole 3 is an upper pole arranged above the acceleration space G, and the pole 4 is a lower pole arranged below the acceleration space G. Further, electrodes (di-electrodes, not shown) are provided between the poles 3 and 4. An electric field is formed by applying a high frequency to this electrode.

The yoke 6 is a hollow disk-shaped block in which poles 3 and 4 and a vacuum vessel 10 are arranged. The yoke 6 includes a cylindrical portion 6a, a top portion 6b formed to close one opening of the cylindrical portion 6a, and a bottom portion 6c formed to close the other opening of the cylindrical portion 6a. The yoke 6 is for preventing the magnetic force lines generated by the superconducting coils 7 and 8 and the poles 3 and 4 from leaking to the outside.

As shown in FIG. 2, the poles 3 and 4 have four hills 11 provided in a spiral shape so as to spiral outward from the vicinity of the central axis C in the radial direction. The hill 11 faces vertically with the acceleration space G in between, and converges the charged particle beam in the acceleration space G in the vertical direction.

The hills 11 are arranged at equal intervals in the circumferential direction of the central axis C, and a valley 12 which is a gap is formed between the hills 11 adjacent to each other in the circumferential direction. That is, leeches 11 and valleys 12 are alternately formed on the poles 3 and 4 in the circumferential direction. In the superconducting cyclotron 1, the magnetic flux density is increased in the hill 11 and the magnetic flux density is decreased in the valley 12, so that the charged particle beam is converged in the vertical direction and the horizontal direction. A superconducting cyclotron that forms a magnetic flux density with strong and weak magnetic flux in the circumferential direction is called an AVF [Azimuthally Varying Field] cyclotron.

In the AVF cyclotron, the four hills 11 are formed so that the magnetic flux density becomes stronger toward the outer side in the radial direction. The hill 11 is formed in a spiral shape in order to strengthen the vertical convergence force of the charged particle beam. If the magnetic flux density becomes weaker toward the outer side in the radial direction, a divergent force in the vertical direction acts on the charged particle beam. The valley 12 is not limited to the voids, and may be a metal having a thickness thinner than that of the hill 11.

As shown in FIG. 1, the superconducting coils 7 and 8 are wound so as to cover the outer circumferences of the poles 3 and 4. The superconducting coil 7 and the superconducting coil 8 are arranged side by side in the central axis C direction. The upper superconducting coil 7 is wound so as to cover the outer circumference of the pole 3, and the lower superconducting coil 8 is wound so as to cover the outer circumference of the pole 4. The superconducting coils 7 and 8 are not provided with an inner frame (or inner winding frame) on the inner peripheral side, for example, and the inner peripheral surface of the coil (adhesive material for fixing the wire rod and the wire rod) is adhered by another member. -It is an air-core coil that is not fixed.

The coil support frame 9 includes a side plate portion 9a that covers the outer peripheral surface of the superconducting coil 7, an upper ring member 9b that covers the upper surface of the superconducting coil 7, and a side plate portion 9c that covers the outer peripheral surface of the superconducting coil 8. A lower ring member 9d that covers the lower surface of the coil 8 and an intermediate portion 9e that connects the upper and lower side plate portions 9a and 9c are provided. The coil support frame 9 is formed over the entire circumference of the superconducting coils 7 and 8 in the circumferential direction.

The upper ring member 9b is formed so as to project inward in the radial direction from the upper end portion of the side plate portion 9a. The upper ring member 9b has an annular plate shape, and the plate thickness direction of the upper ring member 9b is arranged along the central axis C direction.

The lower ring member 9d is formed so as to project inward in the radial direction from the lower end portion of the side plate portion 9c. The lower ring member 9d has an annular plate shape, and the lower ring member 9d is arranged so that the plate thickness direction of the lower ring member 9d is along the central axis C direction.

The intermediate portion 9e has an intermediate ring portion 9f, an upper overhanging portion 9g, and a lower overhanging portion 9h. The radial width of the intermediate ring portion 9f corresponds to the radial width of the superconducting coils 7 and 8. The cross section of the intermediate ring portion 9f is, for example, a rectangle. The upper surface of the intermediate ring portion 9f is in contact with the lower surface of the superconducting coil 7, and the lower surface of the intermediate ring portion 9f is in contact with the upper surface of the superconducting coil 8. The upper overhanging portion 9g and the lower overhanging portion 9h project radially outward from the outer peripheral surface of the intermediate ring portion 9f. The upper overhanging portion 9g and the lower overhanging portion 9h are arranged apart from each other in the central axis C direction. The upper overhanging portion 9g is joined to the side plate portion 9a, and the lower overhanging portion 9h is joined to the side plate portion 9a. Specifically, the upper surface of the upper overhanging portion 9g is in contact with the lower surface of the side plate portion 9a, and the lower surface of the lower overhanging portion 9h is in contact with the upper surface of the side plate portion 9c. The upper overhanging portion 9g and the side plate portion 9a may be joined by bolts or other joining methods such as welding. Similarly, the lower overhanging portion 9h and the side plate portion 9c may be joined by bolts or other joining methods such as welding.

The vacuum vessel 10 houses the superconducting coils 7 and 8 and the coil support frame 9. The vacuum vessel has a coil accommodating portion 10a for accommodating the superconducting coil and the coil support frame 9, a communicating portion 10b communicating with the coil accommodating portion 10a and extending in the vertical direction, and a communicating portion 10c extending in the horizontal direction. The coil accommodating portion 10a has an inner wall 10d arranged radially inside the superconducting coils 7 and 8 and an outer wall 10e arranged radially outside the superconducting coils 7 and 8. The inner wall 10d is arranged so as to cover the inner peripheral side of the superconducting coils 7 and 8 and the coil support frame 9, and the outer wall 10e is arranged so as to cover the outer peripheral side of the superconducting coils 7 and 8 and the coil support frame 9. ing. That is, the superconducting coils 7 and 8 and the coil support frame 9 are arranged in the accommodation space sandwiched between the inner wall 10d and the outer wall 10e.

Further, the vacuum container 10 has an upper surface wall that closes the upper side of the accommodation space and a lower surface wall that closes the lower side of the accommodation space. The upper surface wall is arranged to face the upper ring member 9b in the central axis C direction, and the lower surface wall is arranged to face the lower ring member 9d in the central axis C direction. An opening is provided on the upper wall, and a communication portion 10b is arranged corresponding to the opening. Similarly, an opening is provided in the lower surface wall, and a communication portion 10b is arranged corresponding to the opening.

The communication portion 10b has, for example, a cylindrical shape and extends in the central axis C direction. The communication portion 10b accommodates the vertical load support 22 described later. The communication portion 10c has, for example, a cylindrical shape and extends in an orthogonal direction orthogonal to the central axis C. The communication portion 10c accommodates the horizontal load supports 31 and 32, which will be described later. Further, a refrigerator (cooling unit) 13 for cooling the superconducting coils 7 and 8 is connected to the vacuum container 10. The refrigerator 13 is, for example, a GM refrigerator, and can cool the superconducting coils 7 and 8 to, for example, 4K. The refrigerator is not limited to the GM refrigerator (Gifford-McMahon cooler), and may be another refrigerator such as a Stirling refrigerator.

Here, the superconducting cyclotron 1 and the superconducting electromagnet 5 support the coil support frame 9 and adjust the position of the coil support frame 9 in the central axis C direction with the vertical load support (load support) 22 and the coil. It has horizontal load supports 31 and 32 that support the support frame 9 and adjust the radial position of the coil support frame 9. The radial direction is an orthogonal direction orthogonal to the central axis C.

The vertical load support 22 is connected to the yoke 6 and the vacuum vessel 10, and supports the coil support frame 9 with respect to the yoke 6 and the vacuum vessel 10 in the vertical direction. The vertical load support 22 supports the coil support frame 9 from below. A plurality of vertical load supports 22 are arranged in the circumferential direction of the coil support frame 9. The plurality of vertical load supports 22 are arranged at equal intervals in the circumferential direction of the coil support frame 9.

The upper end of the vertical load support 22 is connected to the lower ring member 9d. The upper end of the vertical load support 22 is connected to the coil support frame 9 via the connecting structure 100 in the vertical direction. A detailed description of the connection structure 100 will be described later. The vertical load support 22 extends downward from the lower ring member 9d, penetrates the wall body of the vacuum vessel 10, and projects to the outside of the yoke 6. At the lower end of the vertical load support 22, a vertical position adjusting portion 78 for positioning the vertical load support 22 with respect to the yoke 6 and the vacuum vessel 10 is provided. The vertical position adjusting portion 78 is a portion that adjusts the positions of the coil support frame 9 with respect to the yoke 6 and the vacuum vessel 10 via the vertical load support 22. The vertical position adjusting portion 78 can displace the vertical load support 22 in the central axis C direction. Examples of the vertical position adjusting unit 78 include position adjustment using screws. By rotating the nut attached to the screw, the screw is moved in the direction of the central axis C, and the vertical load support 22 is displaced.

The configuration of the mounting portion of the vertical load support 22 with respect to the yoke 6 and the vertical position adjusting portion 78 will be described. The vertical position adjusting portion 78 is provided for a portion of the vertical load support 22 that protrudes outward from the lower end of the communication portion 10b of the vacuum vessel 10. A bellows 64 is provided between the vertical load support 22 and the communication portion 10b of the vacuum vessel 10. The vertical position adjusting portion 78 includes a screw portion 59 formed at the lower end portion of the vertical load support 22 and a nut 61 attached to the screw portion 59. The nut 61 is supported by a case 60A provided at the lower end of the communication portion 10b, and is covered with a case 60B provided at the lower end of the case 60A. The pressure inside the cases 60A and 60B is the same as that of the atmosphere. The airtightness between the vacuum vessel 10 and the case 60A is ensured by the bellows 64. When adjusting the position, the case 60B is removed and the exposed nut 61 is rotated. As the nut 61 rotates, the vertical load support 22 moves up and down with respect to the nut 61 via the screw portion 59. As a result, the vertical position of the coil support frame 9 related to the connection point of the vertical load support 22 changes.

The positions of the superconducting coils 7 and 8 with respect to the poles 3 and 4 can be changed by appropriately adjusting the positions of the plurality of vertical load supports 22. Specifically, the superconducting coils 7 and 8 are displaced upward, the superconducting coils 7 and 8 are displaced downward, or the central axis C of the superconducting coils 7 and 8 is tilted with respect to the vertical direction. As such, the superconducting coils 7 and 8 can be displaced.

A current introduction mechanism is provided in the communication portion 10b on the upper side of the vacuum vessel. A current introduction portion 62A is provided at the upper end of the communication portion 10b, and a conductive member 62B extends from the current introduction portion 62A toward the coil support frame 9.

The horizontal load supports 31 and 32 are connected to the yoke 6 and the vacuum vessel 10, and support the coil support frame 9 with respect to the yoke 6 and the vacuum vessel 10 in the horizontal direction from the outside in the radial direction. A part of the horizontal load supports 31 and 32 enters the vacuum vessel 10 and is connected to the coil support frame 9. Further, the horizontal load supports 31 and 32 can adjust the position of the coil support frame 9. A plurality (for example, four) of the horizontal load supports 31 and 32 are provided. Here, the vertical direction is defined as the Z axis, and the axes orthogonal to the Z axis and orthogonal to each other are defined as the X axis (first direction) and the Y axis (second direction) (see FIGS. 3 to 5). When the central axes C of the superconducting coils 7 and 8 are arranged along the Z axis, the X and Y axes are orthogonal to the central axis C. As shown in FIG. 1, the pair of horizontal load supports 31 are arranged to face each other with the coil support frame 9 in between, and the pair of horizontal load supports 32 face each other with the coil support frame 9 in between. Is arranged. The direction X ₁ in which a pair of horizontal load bearing body 31 extends with _(X axis direction), the direction X ₂ in which a pair of horizontal load bearing body 32 extends _(X axis direction), are perpendicular It may intersect at a predetermined angle.

The pair of horizontal load supports 31 support the coil support frame 9 by pulling the coil support frame 9 in opposite directions. Similarly, the pair of horizontal load supports 32 support the coil support frame 9 by pulling the coil support frame 9 in opposite directions.

FIG. 3 is a perspective view showing the horizontal load supports 31 and 32. FIG. 4 is a cross-sectional view showing the horizontal load supports 31 and 32. FIG. 5 is a side view showing the horizontal load supports 31 and 32. As shown in FIGS. 3 to 5, the horizontal load supports 31 and 32 include the coil support frame mounting portion 33, the inner link portion 34, the intermediate connecting portion 35, the outer link portion 36, and the yoke mounting portion. 37 and. Hereinafter, the horizontal load support 31 will be described. Since the horizontal load support 32 has the same configuration as the horizontal load support 31 except that the horizontal load support 32 is arranged in a different direction, the description of the horizontal load support 32 will be omitted.

The coil support frame mounting portion 33 is a portion to be mounted on the coil support frame 9. The coil support frame mounting portion 33 has a flange portion 41 fixed to the coil support frame 9 and an extension portion 42 extending from the flange portion 41. The flange portion 41 has a disk shape, and one surface is connected to the coil support frame 9. The flange portion 41 is connected to the intermediate portion 9e of the coil support frame 9 by bolt joining. The flange portion 41 may be connected to a portion other than the intermediate portion 9e of the coil support frame 9. The coil support frame mounting portion 33 and the inner link portion 34 are made of, for example, titanium. The coil support frame mounting portion 33 and the inner link portion 34 may be formed of a material other than titanium, such as stainless steel.

The extending portion 42 extends from the other surface of the flange portion 41 to the outside in the X-axis direction (the radial outside of the superconducting coils 7 and 8). A connecting block portion 43 is provided at the outer end portion of the extending portion 42 in the X-axis direction. A through hole 43a penetrating in the Y-axis direction is formed in the connecting block portion 43. Further, the side surface of the connecting block portion 43 facing the Y-axis direction is a flat surface.

The inner link portion 34 is a pin member 46 that connects one end of a pair of connecting plates (first direction members) 44, 45 arranged apart from each other in the Y-axis direction and one end of the pair of connecting plates 44, 45. And a spherical shaft 47 that connects the other ends of the pair of connecting plates 44 and 45 to each other.

The connecting plates 44 and 45 have a predetermined length in the X-axis direction. The plate thickness directions of the connecting plates 44 and 45 are arranged along the Y-axis direction. Through holes 44a, 44b, 45a, 45b penetrating in the plate thickness direction are provided at both ends of the connecting plates 44, 45 in the X-axis direction, respectively. Further, the pair of connecting plates 44 and 45 are arranged so as to sandwich the connecting block portion 43 in the Y-axis direction. The inner surface of the connecting plates 44 and 45 (the surface facing the side surface of the connecting block portion 43) is formed as a flat surface. The inner surfaces of the connecting plates 44 and 45 are in contact with the side surfaces of the connecting block portion 43.

The pin member 46 has a columnar shape and is inserted into a through hole 41a of the connecting block portion 43. The outer peripheral surface of the pin member 46 is in contact with the inner peripheral surface of the through hole 41a. The pin member 46 is rotatably supported around the axis of the pin member 46 with respect to the connecting block portion 43. Further, both ends of the pin member 46 project outward from the side surface of the connecting block portion 43 in the Y-axis direction.

Both ends of the pin member 46 in the X-axis direction are inserted into through holes 44a and 45a on one end side of the pair of connecting plates 44 and 45, respectively. At both ends of the pin member 46, the outer peripheral surface of the pin member 46 is in contact with the inner peripheral surface of the through hole 45a on one end side of the pair of connecting plates 44, 45. The pin member 46 is rotatably supported around the axis of the pin member 46 with respect to the pair of connecting plates 44 and 45. As a result, the pair of connecting plates 44 and 45 are rotatably supported around the Y-axis with respect to the coil support frame mounting portion 33.

The spherical shaft 47 has a cylindrical portion 47a provided at both ends in the Y-axis direction and a spherical portion 47b arranged between the cylindrical portions 47a. The cylindrical portion 47a is inserted into the through holes 44b, 45b on the other end side of the pair of connecting plates 44, 45, respectively. The outer peripheral surface of the cylindrical portion 47a is in contact with the inner peripheral surfaces of the through holes 44b, 45b on the other end side of the pair of connecting plates 44, 45.

The spherical portion 47b has an outer diameter larger than the outer diameter of the cylindrical portion 47a. Further, the width of the spherical portion 47b in the Y-axis direction is smaller than the outer diameter of the spherical portion 47b, for example, smaller than the width (thickness) of the connecting block portion 43 in the Y-axis direction. Further, the center of the spherical portion 47b is arranged at the center between the pair of connecting plates 44 and 45.

The intermediate connecting portion 35 is a portion that connects the inner link portion 34 and the outer link portion 36. The intermediate connecting portion 35 is provided on one end side and holds a bearing portion (spherical bearing portion) 48 that holds the spherical shaft 47 of the inner link portion 34, and is provided on the other end side and holds the spherical shaft 47 of the outer link portion 36. It has a bearing portion (spherical bearing portion) 49 and a strap portion 50 that connects both bearing portions 48 and 49.

The bearing portion 48 has a block body, and the block body is formed with a sphere receiving portion that receives the sphere portion 47b of the spherical shaft 47. The sphere receiving portion is an opening that holds the sphere portion 47b. The inner surface shape of the sphere receiving portion corresponds to the outer surface shape of the sphere portion 47b, and the inner surface 48a of the sphere receiving portion is an abutting surface that abuts on the outer surface of the sphere portion 47b. Further, the side surfaces of the bearing portion 48 facing the Y-axis direction are arranged so as to face the inner surfaces of the pair of connecting plates 44, 45 in the Y-axis direction. A predetermined gap is formed between the side surface of the bearing portion 48 and the inner surfaces of the pair of connecting plates 44, 45. The bearing portion 48 is slidable along the outer surface (spherical surface) of the spherical portion 47b of the spherical shaft 47.

In addition, instead of the spherical shaft 47 and the bearing portion 48, a pin member and a spherical sliding bearing may be provided. In the case of this configuration, the pin member held by the spherical sliding bearing is inserted and held through the through holes 44b, 45b on the other end side of the pair of connecting plates 44, 45.

The bearing portion 49 has a block body, and the block body is formed with a sphere receiving portion that receives the spherical portion 53b of the spherical shaft 53 described later of the outer link portion 36. The sphere receiving portion is an opening that holds the sphere portion 53b. The inner surface shape of the sphere receiving portion corresponds to the outer surface shape of the sphere portion 53b, and the inner surface 49a of the sphere receiving portion is an abutting surface that abuts on the outer surface of the sphere portion 53b. Further, the side surfaces of the bearing portion 49 facing the Y-axis direction are arranged so as to face the inner surfaces of the pair of connecting plates 51 and 52 in the Y-axis direction. A predetermined gap is formed between the side surface of the bearing portion 49 and the inner surfaces of the pair of connecting plates 51 and 52. The bearing portion 49 is slidable along the outer surface (spherical surface) of the spherical portion 53b of the spherical shaft 53.

In addition, instead of the spherical shaft 53 and the bearing portion 49, a pin member and a spherical sliding bearing may be provided. In the case of this configuration, the pin member held by the spherical sliding bearing is inserted and held through the through holes 51a and 52a on the other end side of the pair of connecting plates 51 and 52 described later of the outer link portion 36.

The strap portion 50 has a pair of strip-shaped portions 50a and 50b extending in the X-axis direction, separated in the vertical direction as shown in FIG. The thickness directions of the strips 50a and 50b are arranged along the Z-axis direction. Further, the width direction of the band-shaped portions 50a and 50b corresponds to, for example, the width of the bearing portions 48 and 49 in the Y-axis direction. The strap portion 50 is formed of, for example, CFRP (carbon-fiber-reinforced plastic).

One end side of the strips 50a and 50b is connected to the bearing portion 48, and the other end of the strips 50a and 50b is connected to the bearing portion 49. The band-shaped portions 50a and 50b may be fixed to the block bodies of the bearing portions 48 and 49 by fasteners for fixing the strip-shaped portions, and may be joined by adhesion, for example, the block body portion. It may be integrally molded with. Further, the strap portion 50 may be formed in an endless shape by connecting the ends of the pair of strip-shaped portions 50a and 50b to each other.

The strap portion 50 is rotatably supported around the Y-axis with respect to the inner link portion 34. Further, the strap portion 50 is supported so as to be tiltable (rotatable) around the X axis with respect to the inner link portion 34. The strap portion 50 is rotatably supported around the Z-axis with respect to the inner link portion 34.

Similarly, the strap portion 50 is swingably (rotatably) supported around the Y-axis with respect to the outer link portion 36. Further, the strap portion 50 is supported so as to be tiltable (rotatable) around the X axis with respect to the outer link portion 36. The strap portion 50 is rotatably supported around the Z-axis with respect to the outer link portion 36.

Further, the intermediate connecting portion 35 may be provided with a plate-shaped member having a predetermined length instead of the strap portion 50, or may be provided with a rod-shaped member having a predetermined length. Further, the intermediate connecting portion 35 may be configured to include a plurality of strap portions connected via a link mechanism.

The outer link portion 36 is a spherical shaft 53 that connects one end of a pair of connecting plates (first direction members) 51, 52 and a pair of connecting plates 51, 52 that are arranged apart from each other in the Y-axis direction. And a pin member 54 that connects the other ends of the pair of connecting plates 51 and 52 to each other.

The connecting plates 51 and 52 have a predetermined length in the X-axis direction. The thickness directions of the connecting plates 51 and 52 are arranged along the Y-axis direction. Through holes 51a, 51b, 52a, 52b penetrating in the plate thickness direction are provided at both ends of the connecting plates 51 and 52 in the X-axis direction, respectively. Further, the pair of connecting plates 51 and 52 are arranged so as to sandwich the connecting block portion 55 described later of the yoke mounting portion 37 in the Y-axis direction. The inner surface of the connecting plates 51 and 52 (the surface facing the side surface of the connecting block portion 55) is formed as a flat surface. The inner surfaces of the connecting plates 51 and 52 are in contact with the side surfaces of the connecting block portion 55.

The spherical shaft 53 has a cylindrical portion 53a provided at both ends in the axial direction, and a spherical portion 53b arranged between the cylindrical portions 53a. The cylindrical portion 53a is inserted into the through holes 51a and 52a on one end side of the pair of connecting plates 51 and 52, respectively. The outer peripheral surface of the cylindrical portion 53a is in contact with the inner peripheral surfaces of the through holes 51a and 51b on one end side of the pair of connecting plates 51 and 52.

The spherical portion 53b has an outer diameter larger than the outer diameter of the cylindrical portion 53a. Further, the width of the sphere portion in the Y-axis direction is smaller than the outer diameter of the sphere portion 53b, for example, smaller than the width (thickness) of the connecting block portion 55 in the Y-axis direction. Further, the center of the spherical portion 53b is arranged at the center between the pair of connecting plates 51 and 52.

The pin member 54 has a columnar shape and is inserted into a through hole 55a of the connecting block portion 55 of the yoke mounting portion 37. The outer peripheral surface of the pin member 54 is in contact with the inner peripheral surface of the through hole 55a of the connecting block portion 55. The pin member 54 is rotatably supported around the axis of the pin member 54 with respect to the connecting block portion 55. Further, both ends of the pin member 54 project outward from the side surface of the connecting block portion 55 in the Y-axis direction.

Both ends of the pin member 54 in the longitudinal direction are inserted into through holes 51b and 52b on the other end side of the pair of connecting plates 51 and 52, respectively. At both ends of the pin member 54, the outer peripheral surfaces of the pin member 54 are in contact with the inner peripheral surfaces of the through holes 51b, 52b on the other end side of the pair of connecting plates 51, 52. The pin member 54 is rotatably supported around the axis of the pin member 54 with respect to the pair of connecting plates 51 and 52. As a result, the pair of connecting plates 51 and 52 are rotatably supported around the Y-axis with respect to the yoke mounting portion 37.

The yoke mounting portion 37 is a portion that is mounted with respect to the yoke 6. The yoke mounting portion 37 includes a connecting block portion 55, a bellows 56, a rod portion 57, and a horizontal position adjusting portion (second direction position adjusting portion) 58.

A through hole 55a through which the pin member 54 is inserted is formed in the connecting block portion 55. The through hole 55a penetrates in the Y-axis direction. Further, the side surface of the connecting block portion 55 facing the Y-axis direction is a flat surface. The connecting block portion 55 is arranged so as to be sandwiched between the pair of connecting plates 51 and 52, and the pin member 54 inserted through the through holes 55a is inserted into the through holes 51b and 52b of the pair of connecting plates 51 and 52. There is. Further, the side surface of the connecting block portion 55 is in contact with the inner surfaces of the pair of connecting plates 51 and 52.

The connecting block portion 55 is provided with an overhanging portion 55b that projects outward from the outer end surface in the X-axis direction. A rod portion 57 extending outward from the overhanging portion 55b is provided. The rod portion 57 penetrates the vacuum vessel 10 and the yoke 6 and projects outward from the side surface of the yoke 6. A screw portion 59 is formed on the outer peripheral surface of the outer end portion of the rod portion 57. A bellows 56 is connected to the rod portion 57.

The horizontal position adjusting unit 58 is a positioning unit that is fixed to the yoke 6 and positioned with respect to the yoke 6. The horizontal position adjusting portion 58 is a portion that adjusts the positions of the coil support frame 9 with respect to the yoke 6 and the vacuum vessel 10 in the horizontal direction. The horizontal position adjusting portion 58 includes a load support fixing portion 60 projecting outward from the outer peripheral surface of the yoke 6, a threaded portion 59 formed on the outer peripheral surface of the outer end of the rod portion 57, and the threaded portion. It has nuts 61 and 62 attached to 59.

The load support fixing portion 60 is a block body fixed to the yoke 6. The load support fixing portion 60 is joined to the yoke 6 by, for example, welding. The load support fixing portion 60 is formed with a through hole 60a through which the rod portion 57 is inserted. The rod portion 57 is inserted through the through hole 60a and extends to the outside of the yoke 6. Further, the seat surface 60b, which is a surface orthogonal to the X-axis of the load support fixing portion 60, is a flat surface. Further, a key groove is formed on the inner peripheral surface of the through hole 60a to prevent the rod portion 57 from rotating around the axis.

The threaded portion 59 is formed on the outer peripheral surface of the outer end portion of the rod portion 57. The threaded portion 59 is arranged outside the vacuum vessel 10 and the yoke 6. The threaded portion 59 is formed from a portion of the rod portion 57 arranged in the through hole 60a to a portion arranged outside the through hole 60a. A washer 63 and nuts 61 and 62 are attached to the threaded portion 59 of the rod portion 57. The washer 63 is arranged between the seat surface 60b of the load support fixing portion 60 and the nut 61. By tightening the nut 61, the washer 63 is pressed against the seat surface 60b of the load support fixing portion 60. That is, the nut 61 is a member that is fitted into the screw portion 59 of the rod portion 57 and advances and retreats the rod portion 57 with respect to the vacuum container 10 by changing the fitting amount. The nut 62 functions as a lock nut that restrains the movement of the nut 61 after the position adjustment is performed.

Then, by tightening the nut 61, the rod portion 57 moves to the outside in the X-axis direction (right side in the drawing), and a tensile force can be applied to the horizontal load support 31. When a tensile force is generated on the horizontal load support 31, the nut 61 and the washer 63 are pressed against the seat surface 60b of the load support fixing portion 60. As a result, the rod portion 57 is fixed to the load support fixing portion 60 via the nut 61 and the washer 63. That is, the yoke mounting portion 37 of the horizontal load support 31 is fixed to the yoke 6 and relatively fixed to the poles 3 and 4.

Next, the detailed structure of the connection structure 100 will be described with reference to FIG. Although FIG. 6 shows a connection structure 100 for one vertical load support 22, the connection structure 100 for the other vertical load support 22 also has a configuration to the same effect. Omit.

The connection structure 100 is a structure that connects the vertical load support 22 and the coil support frame 9. Further, the connecting structure 100 is a structure that allows the coil support frame 9 and the vertical load support 22 to slide with each other. Further, the connecting structure 100 is a structure in which the coil support frame 9 and the vertical load support 22 are brought into contact with each other to transmit the load and enable relative movement with each other. The connecting structure 100 includes a vertical load support 22 and a holding portion 103 formed on the coil support frame 9. Further, in FIG. 6, the central axis CL is set and described with respect to the vertical load support 22.

The holding portion 103 is formed on the lower surface 108 side of the lower ring member 9d of the coil support frame 9. The holding portion 103 has an L-shaped cross section, and is provided around the central axis CL over the entire circumference. The holding portion 103 includes a stretched portion 104 extending downward from the lower surface 108 of the lower ring member 9d, and a protruding portion 106 protruding downward from the lower end portion of the stretched portion 104 toward the central axis CL side. The inner peripheral surface 109 of the stretched portion 104 is a surface (second direction surface) facing the facing portion 110, which will be described later, via the gap GP in the horizontal direction. As described above, a gap GP is formed in the horizontal direction between the coil support frame 9 and the posture changing portion 102 of the vertical load support 22. Since the tip 106a of the protrusion 106 is separated from the central axis CL toward the outer peripheral side, an opening 107 surrounded by the tip 106a of the protrusion 106 is formed at the lower end of the holding portion 103. A space for accommodating the outer peripheral edge portion of the facing portion 110, which will be described later, is formed between the protruding portion 106, the lower surface 108 of the lower ring member 9d, and the inner peripheral surface 109 of the extending portion 104.

Here, the lower surface 108 of the lower ring member 9d is a surface (first direction surface) facing the superconducting coil 8 in the vertical direction. The lower surface 108 functions as a receiving surface on which the facing portion 110, which will be described later, is slid. The lower surface 108 also functions as a load transmission surface between the coil support frame 9 and the facing portion 110. The lower surface 108 may be configured as a low friction portion that has been subjected to a low friction treatment in order to make the facing portion 110 slippery. The lower surface 108 configured as the low friction portion has a smaller coefficient of friction than the other portions of the coil support frame 9. For example, the friction coefficient of the lower surface 108 is lower than the friction coefficient of the inner peripheral surface 109 and the lower end portion 106b of the coil support frame 9. Specifically, as the low friction treatment, a low friction plate 130 having a low friction coefficient may be arranged at the lower end of the lower ring member 9d. As the low friction plate 130, a plate member made of a non-magnetic material such as stainless steel is adopted. Further, as a low friction treatment, the lower surface 108 of the lower ring member 9d may be directly surface-treated. Examples of the surface treatment include a processing treatment such as polishing that reduces the roughness of the surface, and a coating treatment that covers the surface with a low-friction material such as Teflon (registered trademark) or DLC (Diamond-Like Carbon). The portion of the lower surface 108 that has been subjected to the low friction treatment is formed in substantially the entire area inside the inner peripheral surface 109 of the stretched portion 104. As will be described later, the facing surface 110a, which is the sliding surface on the mating side of the lower surface 108, has a spherical surface. Therefore, the facing surface 110a does not come into contact with all the parts of the lower surface 108 that have been subjected to the low friction treatment. Therefore, the portion of the lower surface 108 that has been subjected to the low friction treatment may be provided only in the region that can come into contact with the facing surface 110a. Further, the portion of the lower surface 108 that has been subjected to the low friction treatment may be a part of the region that can come into contact with the facing surface 110a.

The vertical load support 22 includes a rod-shaped member 101 extending in the vertical direction and a posture changing portion 102. The rod-shaped member 101 is a member that enters the vacuum vessel 10 and extends toward the coil support frame 9. The rod-shaped member 101 extends linearly in the vertical direction in the communication portion 10b of the vacuum container 10, and penetrates the vacuum container 10 at the lower end side. The posture changing portion 102 is provided at the upper end portion of the rod-shaped member 101, and is held by the holding portion 103 of the coil support frame 9. That is, the rod-shaped member 101 is connected to the holding portion 103 of the coil support frame 9 via the posture changing portion 102.

The posture changing unit 102 is a portion that changes its posture following the vertical movement of the coil support frame 9 by the vertical position adjusting unit 78 (see FIG. 1). Further, the posture changing unit 102 can change the posture by following the movement of the coil support frame 9 in the horizontal direction by the horizontal position adjusting unit 58 (see FIG. 1). The posture changing portion 102 includes a facing portion 110 and a spherical bearing 120.

The facing portion 110 is a substantially disk-shaped member housed in a space formed between the lower surface 108 of the holding portion 103 and the protruding portion 106. The outer diameter of the facing portion 110 is larger than the inner diameter of the tip portion 106a of the protruding portion 106. Therefore, the outer peripheral edge portion of the facing portion 110 is supported by the protruding portion 106. The facing portion 110 has a facing surface 110a facing the lower surface 108 of the coil support frame 9. The facing surface 110a may be curved so as to be convex toward the lower surface 108 of the coil support frame 9. In the present embodiment, the facing surface 110a is composed of a spherical surface that projects upward. As a result, the facing surface 110a comes into point contact with the lower surface 108 of the coil support frame 9. The facing surface 110a is a spherical surface with the central axis CL as the central axis. Therefore, the facing surface 110a makes point contact with the lower surface 108 of the coil support frame 9 at the position of the central axis CL. The curvature of the spherical surface of the facing surface 110a may be gentler than that shown in FIG. Further, the shape of the facing surface 110a is not particularly limited as long as it has a shape that makes point contact or substantially point contact with the lower surface 108 of the coil support frame 9, and is inclined toward the lower surface 108, for example. It may be a tapered surface. A slight gap is provided between the lower surface 110b of the facing portion 110 and the upper surface of the protruding portion 106.

The diameter of the facing portion 110 having the facing surface 110a in the horizontal direction is smaller than the diameter of the region surrounded by the inner peripheral surface 109. Therefore, a gap GP is formed between the facing portion 110 and the inner peripheral surface 109 as described above. As described above, a gap GP is formed in the horizontal direction between the coil support frame 9 and the posture changing portion 102 of the vertical load support 22. Therefore, the facing portion 110 of the vertical load support 22 slides with respect to the holding portion 103 of the coil support frame 9 within a range permitted by the size of the gap GP. That is, the vertical load support 22 and the coil support frame 9 move relative to each other in the horizontal direction within a range allowed by the size of the gap GP.

The spherical bearing 120 is a member provided between the facing portion 110 and the rod-shaped member 101 and rotatably supports the facing portion 110. The spherical bearing 120 includes a movable portion 121 that moves following the movement of the coil support frame 9 together with the facing portion 110, and a fixed portion 122 that is fixed to the rod-shaped member 101 and supports the movable portion 121.

The movable portion 121 includes a sphere portion 123 arranged below the facing portion 110, and a connecting portion 124 that connects the sphere portion 123 and the facing portion 110. The sphere portion 123 is a member composed of a sphere whose center is arranged on the central axis CL. The center of the spherical portion 123 is arranged at least below the protruding portion 106 of the holding portion 103 of the coil support frame 9. A plane 123a may be formed on the lower end side of the spherical portion 123. The connecting portion 124 is a columnar member extending upward from the upper end side of the spherical portion 123. The outer diameter of the connecting portion 124 is smaller than the inner diameter of the opening 107 of the holding portion 103. The connecting portion 124 is fixed to the spherical portion 123 and the facing portion 110. That is, the facing portion 110 is fixed to the spherical portion 123 via the connecting portion 124.

The fixed portion 122 is a tubular member that surrounds the spherical portion 123 and rotatably supports the movable portion 121. The fixed portion 122 is arranged so that its central axis coincides with the central axis CL. The inner peripheral surface of the fixed portion 122 is configured as a receiving surface 122a that slidably receives the spherical portion 123. The receiving surface 122a has a shape that curves outward in the radial direction along the spherical surface of the spherical portion 123. The lower end portion 122b of the fixing portion 122 is formed in a flat shape and is fixed to the upper end portion of the rod-shaped member 101. A space is formed inside the rod-shaped member 101 to prevent the rotating movable portion 121 from interfering with the spherical portion 123 (see FIG. 8). The upper end portion 122c of the fixing portion 122 is arranged at a position separated below the lower end portion 106b of the protruding portion 106 of the holding portion 103. As a result, a gap is formed between the fixed portion 122 and the holding portion 103, and when the coil support frame 9 moves due to the gap, it is possible to prevent the fixed portion 122 and the protruding portion 106 from interfering with each other (FIG. 8). reference).

Next, the actions and effects of the superconducting cyclotron 1 and the superconducting electromagnet 5 according to the present embodiment will be described.

In the superconducting cyclotron 1, the superconducting coils 7 and 8 of the superconducting electromagnet 5 are energized, and magnetic flux is generated around the superconducting coils 7 and 8. This magnetic flux passes through the yoke 6 and the poles 3 and 4 to form a magnetic circuit around the superconducting coils 7 and 8, and a magnetic field is formed in the acceleration space G between the pair of opposing poles 3 and 4. Then, the charged particles supplied to the acceleration space G are accelerated by a magnetic field and an electric field and emitted as a charged particle beam.

In the superconducting cyclotron 1, the vertical position of the coil support frame 9 can be adjusted by using the vertical load support 22. Further, the position can be adjusted so as to change the inclination of the coil support frame 9 by adjusting the position by the plurality of vertical load supports 22. Thereby, the positions and inclinations of the superconducting coils 7 and 8 can be adjusted, and the magnetic field in the acceleration space G can be adjusted to adjust the charged particle beam.

In the superconducting cyclotron 1, since the coil support frame 9 is supported by the horizontal load supports 31 and 32, the coil support frame is used in the direction orthogonal to the central axis C direction by using the horizontal load supports 31 and 32. The position can be adjusted by moving 9.

Further, since the horizontal load supports 31 and 32 are provided with the horizontal position adjusting portion 58, by rotating the nut 61, the rod portion 57 is moved in the X-axis direction with respect to the load support fixing portion 60. Can be moved to. By appropriately moving the positions of the plurality of horizontal load supports 31 and 32, the coil support frame 9 can be moved in the direction orthogonal to the central axis C to adjust the position. As a result, the superconducting coils 7 and 8 can be moved in the direction orthogonal to the central axis C, and the magnetic field generated by the superconducting coils 7 and 8 can be adjusted to adjust the charged particle beam.

Further, since the horizontal position adjusting portion 58 can displace the rod portion 57 by rotating the nut 61, the displacement amount of the rod portion 57 with respect to one rotation of the nut 61 can be made constant. Therefore, it is possible to easily manage the position adjustment. Similar actions and effects can be obtained for the vertical position adjusting unit 78.

Further, the superconducting cyclotron 1 has a plurality of vertical load supports 22 provided along the circumferential direction of the coil support frame 9 for supporting the coil support frame 9 with respect to the vacuum vessel 10 in the vertical direction, and the vertical direction. In the above, a plurality of vertical position adjusting portions 78 for adjusting the position of the coil support frame 9 with respect to the vacuum vessel 10 are provided via the respective vertical load supports 22. Therefore, the position of the coil support frame 9 with respect to the vacuum vessel 10 can be adjusted by the vertical position adjusting unit 78. Here, the vertical load support 22 has a posture changing portion 102 that changes its posture following the vertical movement of the coil support frame 9 by the vertical position adjusting portion 78. When the coil support frame 9 is vertically adjusted together with the superconducting coils 7 and 8 in this way, the vertical load support 22 moves in the vertical direction of the coil support frame 9 at the posture changing portion 102. The posture changes to follow. Therefore, the vertical load support 22 can allow the position adjustment of the coil support frame 9 and the superconducting coils 7 and 8 in a wide range. As described above, the position adjustment range of the superconducting coils 7 and 8 can be widened.

In the superconducting cyclotron 1, the coil support frame 9 has a lower surface 108 facing the superconducting coils 7 and 8 in the vertical direction, and the vertical load support 22 is a rod-shaped member 101 connected to the vacuum vessel 10. The attitude changing portion 102 faces the lower surface 108 of the coil support frame 9, and has an opposing surface 110a that is convex and curved toward the lower surface 108, and the facing portion 110 and the rod-shaped member 101. A spherical bearing 120, which is provided between the two and rotatably supports the facing portion 110, may be provided. When the vertical position adjusting portion 78 is adjusted with respect to any of the vertical load supports 22 among the plurality of vertical load supports 22, the coil support frame 9 is moved in the vertical direction together with the superconducting coils 7 and 8. It moves so as to incline. In response to such movement of the coil support frame 9, the posture changing portion 102 faces the lower surface 108 of the coil support frame 9 and has an opposing surface 110a that is convex and curved toward the lower surface 108. It is equipped with 110. As a result, the facing surface 110a and the lower surface 108 are easily slid. Further, the posture changing portion 102 is provided between the facing portion 110 and the rod-shaped member 101, and includes a spherical bearing 120 that rotatably supports the facing portion 110. As a result, the facing portion 110 can be rotated by the spherical bearing 120 according to the inclination of the coil support frame 9. Therefore, the posture changing unit 102 can appropriately change the posture by following the movement of the coil support frame 9 in the vertical direction.

Here, the mode of the posture change of the posture change unit 102 accompanying the vertical position adjustment of the superconducting coils 7 and 8 will be described. As described above, a plurality of vertical load supports 22 are arranged in the circumferential direction of the coil support frame 9. A plurality of vertical position adjusting portions 78 are also arranged in the circumferential direction of the coil support frame 9 corresponding to the vertical load supports 22. When adjusting the positions of the superconducting coils 7 and 8 in the vertical direction, the plurality of vertical position adjusting units 78 are adjusted one by one. That is, when one vertical position adjusting unit 78 is adjusted and the vertical position of one corresponding vertical load support 22 is changed, the vertical position of the other vertical load support 22 in the circumferential direction is changed. The position of the direction does not change. Therefore, the coil support frame 9 is subjected to a force that moves in the vertical direction only on the portion corresponding to the vertical load support 22 related to the position adjustment. Therefore, when the vertical position adjustment unit 78 adjusts the vertical position, the coil support frame 9 does not move in the vertical direction while the angle with respect to the horizontal direction is kept constant, but the angle with respect to the horizontal direction changes. Move to do.

For example, as shown in FIG. 6, the vertical load support 22 is slightly moved upward by adjusting the vertical position adjusting portion 78 from the state where the lower surface 108 of the coil support frame 9 is horizontal. In this case, as shown in FIG. 8, the coil support frame 9 moves upward in such a manner that the lower surface 108 is slightly inclined with respect to the horizontal direction. At this time, the angle of the coil support frame 9 with respect to the vertical load support 22 changes slightly. The spherical bearing 120 of the posture changing portion 102 rotates the opposing portion 110 that moves with the movement of the coil support frame 9. The movable portion 121 connected to the facing portion 110 rotates in the rotation direction D1 with respect to the fixed portion 122 (see FIG. 8). As a result, the spherical bearing 120 of the posture changing portion 102 can allow the coil support frame 9 to move while maintaining the connected state between the vertical load support 22 and the coil support frame 9. Further, the facing surface 110a of the facing portion 110 is a spherical surface that is convex and curved toward the lower surface 108 of the coil support frame 9. Therefore, the lower surface 108 of the coil support frame 9 can smoothly slide with respect to the facing surface 110a. The lower surface 108 of the coil support frame 9 can rotate slightly with respect to the facing portion 110 along the curved shape of the facing surface 110a. In FIG. 8, the gap between the lower surface 110b and the upper surface of the protrusion 106 is maintained on both the positive and negative sides in the X-axis direction on the paper surface, but is positive in the X-axis direction. The coil support frame 9 may slide with respect to the facing surface 110a so that the gap on the side or the gap on the negative side is narrowed. Further, the lower surface 108 of the coil support frame 9 can be guided by the facing surface 110a and slide laterally with respect to the facing portion 110. As a result, the posture changing portion 102 can allow the coil support frame 9 to move while maintaining the connected state between the vertical load support 22 and the coil support frame 9.

Further, the superconducting cyclotron 1 is further provided with a horizontal position adjusting portion 58 for adjusting the position of the coil support frame 9 with respect to the vacuum vessel 10 in the horizontal direction, and the coil support frame 9 is provided with a gap GP with the facing portion 110 in the horizontal direction. When the coil support frame 9 has the inner peripheral surfaces 109 facing each other via (see FIG. 6) and the coil support frame 9 moves in the horizontal direction due to the position adjustment of the horizontal position adjusting portion 58, the lower surface 108 of the coil support frame 9 faces each other. It may be configured to be slidable along the facing surface 110a of the portion 110. As a result, when the position of the coil support frame 9 is adjusted in the horizontal direction by the horizontal position adjustment unit 58, the coil support frame 9 has a range of dimensions of the gap GP between the facing portion 110 and the inner peripheral surface 109. Within, it can move smoothly in the horizontal direction. For example, as shown in FIG. 7, when the coil support frame 9 moves in the horizontal direction (indicated by D2 in the figure) toward the outer peripheral side, the lower surface 108 is guided by the facing surface 110a as shown by a virtual line. As such, the coil support frame 9 slides in the horizontal direction.

The superconducting electric magnet 5 according to the present embodiment is a superconducting electric magnet 5 that generates a magnetic field, and is a coil support that supports the superconducting coils 7 and 8 wound around the central axis C and the superconducting coils 7 and 8. A plurality of frames 9, a vacuum container 10 for accommodating the superconducting coils 7 and 8 and the coil support frame 9 inside, and a plurality of frames along the circumferential direction of the coil support frame 9 for supporting the coil support frame 9 in the vertical direction are provided. The vertical load support 22 is provided with a vertical load support 22 and a plurality of vertical position adjusting portions 78 for adjusting the position of the coil support frame 9 via the respective vertical load supports 22. It has a posture changing unit 102 that changes its posture following the movement of the coil support frame 9 in the vertical direction by the vertical position adjusting unit 78.

According to this superconducting electromagnet 5, the same action and effect as the above-mentioned superconducting cyclotron 1 can be obtained.

Further, the superconducting cyclotron 1 according to the present embodiment includes a vertical load support 22 that supports the coil support frame 9 in the vacuum vessel 10 in the vertical direction. In such a structure, the coil support frame 9 and the vertical load support 22 can slide with each other. Therefore, the positions of the superconducting coils 7 and 8 supported by the coil support frame 9 can be changed in the vacuum vessel 10, so that the positions can be adjusted. Further, the lower surface 108 of the coil support frame 9 is configured as a low friction portion subjected to a low friction treatment. Therefore, when the positions of the superconducting coils 7 and 8 are adjusted in the vacuum vessel 10, the coil support frame 9 supporting the superconducting coils 7 and 8 slides smoothly with respect to the vertical load support 22. be able to. This facilitates the position adjustment of the superconducting coils 7 and 8. As described above, the positions of the superconducting coils 7 and 8 can be appropriately adjusted.

In the superconducting cyclotron 1, a gap GP may be formed in the horizontal direction between the coil support frame 9 and the vertical load support 22. As a result, a sufficient stroke for sliding can be secured between the coil support frame 9 and the vertical load support 21.

The superconducting cyclotron 1 according to the present embodiment includes a vertical load support 22 that supports the coil support frame 9 in the vacuum vessel 10 in the vertical direction. In such a structure, the coil support frame 9 and the vertical load support 22 come into contact with each other to transmit the load, and can move relative to each other. Therefore, the positions of the superconducting coils 7 and 8 supported by the coil support frame 9 can be changed in the vacuum vessel 10 while the load is supported by the contact with the vertical load support 22. Adjustment is possible. As described above, the positions of the superconducting coils 7 and 8 can be appropriately adjusted.

The present invention is not limited to the above-described embodiment, and various modifications as described below are possible without departing from the gist of the present invention.

The superconducting coils 7 and 8 of the superconducting electromagnet 5 are not limited to having two superconducting coils 7 and 8, and may have one or three or more superconducting coils.

Further, the superconducting electromagnet according to the present invention is not limited to the cyclotron, and can be applied to a silicon single crystal pulling device by the MCZ method. The superconducting electromagnet can be applied to any device that requires a high magnetic field.

Further, in the above embodiment, the configuration includes four horizontal load supports 31 and 32, but a configuration including one horizontal load support may be provided, and two or more horizontal load supports are provided. It may be configured.

Further, in the above embodiment, the central axes C of the superconducting coils 7 and 8 are arranged along the vertical direction, but the superconducting coils 7 and 8 are arranged so that the central axes C are arranged along the horizontal direction. Alternatively, the superconducting coils 7 and 8 in which the central axis C is arranged so as to be inclined with respect to the vertical direction may be used.

In the above-described embodiment, the connecting structure 100 is provided between the coil support frame 9 and the vertical load support 22. Instead of this, the connecting structure 100 may be provided on the vacuum container 10 side. For example, as shown in FIG. 9, the connecting structure 200 may be provided at an intermediate position of the vertical load support 222. The vertical load support 222 includes a rod-shaped member 201 that enters the vacuum vessel 10 and is connected to the coil support frame 9. Further, a holding portion 203 and a posture changing portion 102 are provided at an intermediate position of the rod-shaped member 201 in the vertical direction. The upper portion of the rod-shaped member 201 is referred to as the upper rod-shaped member 201A, and the lower portion is referred to as the lower rod-shaped member 201B. The lower surface 208 is formed as a first direction surface of the holding portion 203 provided at the lower end of the upper rod-shaped member 201A so as to face the superconducting coils 7 and 8 in the vertical direction. The upper end of the upper rod-shaped member 201A is fixed to the coil support frame 9. The posture changing portion 102 is provided between the holding portion 203 and the upper end of the lower rod-shaped member 201B. The posture changing portion 102 itself has the same configuration as the connection structure 100 described above.

According to such a configuration, when the vertical position adjusting portions 78 are adjusted with respect to the plurality of vertical load supports 222, the coil support frame 9 is inclined in the vertical direction together with the superconducting coils 7 and 8. To move. In response to such movement of the coil support frame 9, the posture changing portion 102 faces the lower surface 208 of the upper rod-shaped member 201A and has an opposing surface 110a that is convex and curved toward the lower surface 108. It is equipped with 110. As a result, the facing surface 110a and the lower surface 208 are easily slid. Further, the posture changing portion 102 is provided between the facing portion 110A and the lower rod-shaped member 201B, and includes a spherical bearing 120 that rotatably supports the facing portion 110. As a result, the facing portion 110 can be rotated by the spherical bearing 120 according to the inclination of the coil support frame 9. Therefore, the posture changing portion 102 can appropriately change the posture by following the vertical movement of the coil support frame 9 and the upper rod-shaped member 201A. The holding portion 203 may be provided at the upper end of the lower rod-shaped member 201B, and the posture changing portion 102 may be provided at the lower end of the upper rod-shaped member 201A by turning it upside down.

Further, in the above-described embodiment, in addition to the sliding structure formed by the facing surface 110a and the lower surface 108, the structure of the spherical bearing 120 is provided. Instead of this, the structure of the spherical bearing 120 may be omitted and a structure having only a sliding structure may be adopted. Further, in the facing portion 110, only the facing surface 110a, which is the upper surface thereof, is formed in a spherical shape. Instead of this, the entire facing portion 110 may be formed into a flat spherical shape. In this case, the entire space inside the holding portion 103 may be spherical along the facing portion 110, and the facing portion 110 may be slidable in the internal space of the holding portion 103. In this case, the internal space of the holding portion 103 may be formed larger in the horizontal direction than the facing portion 110. As a result, a horizontal gap is formed between the holding portion 103 and the facing portion 110.

Further, the structure may be such that the coil support frame 9 and the vertical load support 22 are in contact with each other to transmit the load and enable relative movement with each other. It does not have to be a sliding structure according to 108. For example, as shown in FIG. 10, the structure may be a sphere. The vertical support 322 of the connecting structure 300 shown in FIG. 10 may include a rod-shaped portion 301 and a rolling portion 302 formed on the upper side of the rod-shaped portion 301. The rolling portion 302 includes a plurality of spherical portions 312 arranged in the horizontal direction and a holding portion 311 for holding the plurality of spherical portions 312. The plurality of spherical portions 312 of the spherical portion 312 are in contact with the lower surface of the coil support frame 9, and are capable of sliding and relative movement. Further, the lower surface of the coil support frame 9 is configured as a low friction portion 308 that has been subjected to a low friction treatment.

The support structure of the superconducting cyclotron is not limited to the above-described embodiment. For example, in the above-described embodiment, the vertical load support is provided only on the lower side. Instead of this, the lower vertical load support may be provided on the upper side of the coil support frame 9. Alternatively, it may be supported so as to be suspended only by the upper vertical load support, and the four lower vertical load supports 22 may be omitted. Further, although the vertical position adjusting portion 78 is attached to the yoke 6, it may be arranged inside the yoke 6 and attached to the vacuum vessel 10.

Further, in the above-described embodiment, the low friction portion is formed only on the coil support frame 9 side. Instead of this, a low friction portion may be formed on both the surface on the coil support frame 9 side and the surface on the vertical load support 22 side (opposing surface 110a), and the surface on the vertical load support 22 side may be formed. Only low friction portions may be formed.

1 ... Superconducting cyclotron, 5 ... Superconducting electromagnet, 7, 8 ... Superconducting coil, 9 ... Coil support frame (coil support), 22 ... Vertical load support (load support), 108, 208 ... Bottom surface (bottom surface (load support)) Low friction part).

Claims (2)

A superconducting cyclotron that accelerates charged particles and emits charged particle beams.
A superconducting coil wound around the winding center axis,
A coil support that supports the superconducting coil and
A vacuum container that houses the superconducting coil and the coil support inside,
A load support that supports the coil support in the vacuum vessel in the first direction in which the winding center axis extends is provided.
The coil support and the load support are slidable with each other, and a low friction portion having been subjected to low friction treatment is formed on at least one surface thereof .
A superconducting cyclotron in which a gap is formed between the coil support and the load support in a second direction orthogonal to the first direction. A superconducting cyclotron that accelerates charged particles and emits charged particle beams.
A superconducting coil wound around the winding center axis,
A coil support that supports the superconducting coil and
A vacuum container that houses the superconducting coil and the coil support inside,
A load support that supports the coil support in the vacuum vessel in the first direction in which the winding center axis extends is provided.
The coil support and the load support are in contact with each other to transmit a load and enable relative movement with each other .
A superconducting cyclotron in which a gap is formed between the coil support and the load support in a second direction orthogonal to the first direction.

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