JP5590550B2 - Electromagnetic system with variable magnetic field distribution - Google Patents

Description

  The present invention relates to an electromagnet system used in a particle beam accelerator or the like, and more particularly to a variable magnetic field distribution type electromagnet system that can change the magnetic field distribution.

  In synchrotron-based particle beam accelerators that accelerate particles such as protons, multiple accelerators, multiple deflection electromagnets, multiple converging electromagnets, etc. are arranged along the vacuum chamber (vacuum cavity pipe) that constitutes the link. Each acceleration device, each deflection electromagnet, each focusing electromagnet, and the like are operated to accelerate charged particles introduced into the vacuum chamber of the ring from the incident path side.

  FIG. 10 is a front sectional view of a deflection electromagnet used in such a conventional particle beam accelerator.

  A deflection electromagnet 101 shown in FIG. 10 includes a magnetic body 102 made of a magnetic material or the like formed in a window frame shape, and a forward excitation coil 104 disposed in a gap (gap) 103 formed in the magnetic body 102. And a deflection excitation coil 109 constituted by the return path side excitation coil 106.

  In response to an instruction from an accelerator control device (not shown), when an excitation current is supplied from an excitation power source (not shown), a magnetic line of force is generated in the magnetic body 102 by the forward excitation coil 104. 105, and a magnetic force line 107 is generated in the magnetic body 102 by the return side exciting coil 106.

  As a result, a magnetic field line (deflection magnetic field line) 108 having a flat magnetic field distribution characteristic is generated in the gap 103 as shown in FIG. 11 and passes through a vacuum chamber (not shown) disposed in the gap 103. Charged particles are deflected horizontally.

  By the way, since the conventional deflection electromagnet 101 used in such a particle beam accelerator has only one function of deflecting charged particles, a large number of deflection electromagnets along the vacuum chamber constituting the ring, A space necessary for arranging a large number of converging electromagnets and a large number of acceleration devices must be secured. Therefore, there is a problem that the ring itself becomes large.

The present invention has been made in view of the above circumstances, by changing the magnetic field distribution of the magnetic lines of force for adjusting the trajectory of the load conductive particles, various deflecting function, various convergence function, can have like other features, whereby the ring Providing a variable magnetic field distribution type electromagnet system that can significantly reduce the number of types of electromagnets used, reduce the cost and size of the accelerator, and increase the response speed more than twice. The purpose is to do.

For this reason, in the present invention, by combining two C-type excitation units and exciting each of these C-type excitation units independently, the magnetic field distribution in the gap defined by each C-type excitation unit is obtained. This makes it possible to change the number of electromagnets used in the ring by providing a deflection function, a convergence function, and other functions in addition to the deflection function, thereby reducing the cost and size of the accelerator. It is an object of the present invention to provide a variable magnetic field distribution type electromagnet system.

Further, in the invention according to claim 2 of the present application , the two C-type excitation units are excited independently, and a two-pole excitation pattern, a four-pole excitation pattern, Or a magnetic field that can generate magnetic field lines corresponding to any of the functional coupling patterns, thereby significantly reducing the number of types of electromagnets used in the ring and reducing the cost and size of the accelerator. An object is to provide a variable distribution type electromagnet system.

Further, in the invention according to claim 3 of the present application , a plurality of arc-shaped excitation units are combined, and each of these arc-shaped excitation units is excited independently of each other, whereby the space defined by each arc-shaped excitation unit is obtained. This makes it possible to change the magnetic field distribution of the magnet, thereby making it possible to adjust the convergence function, etc., greatly reducing the number of types of electromagnets used in the ring, and reducing the cost and size of the accelerator. An object of the present invention is to provide a variable magnetic field distribution type electromagnet system.

In the invention according to claim 4 of the present application , a plurality of arc-shaped excitation units are combined, and each of these arc-shaped excitation units is excited independently, and the space is defined within each space defined by each arc-shaped excitation unit. Magnetic field lines corresponding to either the pole excitation pattern or the quadrupole excitation pattern can be generated, which greatly reduces the number of types of electromagnets used in the ring, thereby reducing the cost and size of the accelerator. It is an object of the present invention to provide a variable magnetic field distribution type electromagnet system.

To achieve the above object, the present invention is, in the magnetic field distribution variable electromagnet system, and generate magnetic lines of force in the electromagnet system for controlling the trajectory of charged particles, so as to surround the vacuum chamber for passage of charged particles a plurality of excitation units arranged on, each respective exciter, specified current direction, and generates an excitation current of a current value, and a magnetizing power source for each energized the respective exciter, the excitation Each of the units includes a C-shaped magnetic body, an excitation coil that generates a magnetic line of force in the magnetic body when an excitation current is supplied from the excitation power supply, and one of the excitation units so as to surround the vacuum chamber. An excitation current to be supplied to one of the excitation units from the excitation power source, and to the other excitation unit, arranged opposite to the end of the other excitation unit. Each excitation current that, by controlled, is characterized in that to control the magnetic field distribution of one of the excitation unit, gap magnetic field lines generated by the other of the exciting unit.

Delete

Also, each in claim 2, in the magnetic field distribution variable electromagnet system according to claim 1, wherein the excitation power supply, one of the exciting unit, the current direction of the other of the excitation unit for supplying exciting current, a current value The magnetic field lines corresponding to any one of the dipole magnetic field distribution characteristic, the quadrupole magnetic field distribution characteristic, and the function-coupled magnetic field distribution characteristic are generated in the gaps of the respective excitation units.

Further, in claim 3 , in the variable magnetic field distribution type electromagnet system according to claim 1, each of the excitation units has an arc-shaped magnetic body in which two protrusions are formed on the inner surface side. When an excitation current is supplied from the excitation power source, the coil is wound in an “8” shape, and includes an excitation coil that generates a line of magnetic force in each of the protrusions and the magnetic body so as to surround the vacuum chamber and The excitation units are arranged in a circle so that adjacent ends of the ends of the unit are in close contact with each other, or the excitation current supplied from the excitation power source to the excitation units is controlled. The magnetic field distribution of the magnetic field lines generated in the circular space defined by each excitation unit is controlled.

According to a fourth aspect of the present invention , in the variable magnetic field distribution type electromagnet system according to the third aspect , the excitation power source adjusts a current direction and a current value of an excitation current to be supplied to each of the excitation units. Magnetic field lines corresponding to either the octupole magnetic field distribution characteristic or the quadrupole magnetic field distribution characteristic are generated in the circular space defined by the unit.

In the magnetic field distribution variable electromagnet system according to the present invention, by varying the magnetic field distribution of the magnetic lines of force for adjusting the trajectory of charged particles, various deflecting function, various convergence function, can have like other features, whereby the ring in greatly reducing the number of types of electromagnets are used, cost of the accelerator, it is possible to achieve miniaturization, further response speed twice or more, it is possible to speed up, the two C-type exciter By combining these C-type excitation units independently, the magnetic field distribution in the gap defined by each C-type excitation unit can be changed. By providing functions and other functions, the number of types of electromagnets used in the ring can be greatly reduced, and the cost and size of the accelerator can be reduced .

Delete

Further, in the magnetic field distribution variable electromagnet system according to claim 2 , two C-type excitation units are excited independently, and a two-pole excitation pattern and a four-pole excitation are formed in a gap defined by each C-type excitation unit. Magnetic field lines corresponding to either the pattern or the functional coupling pattern can be generated, which can greatly reduce the number of types of electromagnets used in the ring and achieve lower cost and smaller size of the accelerator it can.

In the magnetic field distribution variable electromagnet system according to claim 3 , a plurality of arc-shaped excitation units are combined, and each of the arc-shaped excitation units is excited independently, thereby being defined by each arc-shaped excitation unit. It is possible to change the magnetic field distribution in the space, thereby making it possible to adjust the convergence function, etc., greatly reducing the number of types of electromagnets used in the ring, and reducing the cost and size of the accelerator be able to.

In the variable magnetic field distribution type electromagnet system according to claim 4 , a plurality of arc-shaped excitation units are combined, and each of these arc-shaped excitation units is excited independently, and the space defined by each arc-shaped excitation unit Can generate magnetic field lines corresponding to either the 8-pole excitation pattern or the 4-pole excitation pattern, thereby greatly reducing the number of types of electromagnets used in the ring, thereby reducing the cost and size of the accelerator. To achieve.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front side sectional view showing a first embodiment of a variable magnetic field distribution type electromagnet system according to the present invention. FIG. 2 is a front side sectional view showing an installation example of the magnetic field distribution variable electromagnet system shown in FIG. 1. It is a schematic diagram which shows the example of excitation when using the magnetic field distribution variable electromagnet system shown in FIG. 1 as a 2 pole deflection | deviation electromagnet. It is a schematic diagram which shows the example of excitation when using the magnetic field distribution variable electromagnet system shown in FIG. 1 as a quadrupole electromagnet. It is a schematic diagram which shows the example of excitation when using the magnetic field distribution variable electromagnet system shown in FIG. 1 as a function coupling | bonding type electromagnet. It is front sectional drawing which shows the 2nd form of the magnetic field distribution variable electromagnet system by this invention. It is front sectional drawing which shows the detailed structural example of the 1st electromagnet unit-4th electromagnet unit shown in FIG. It is a schematic diagram which shows the example of excitation when using the magnetic field distribution variable electromagnet system shown in FIG. 6 as an octupole electromagnet. It is a schematic diagram which shows the example of excitation when using the magnetic field distribution variable electromagnet system shown in FIG. 6 as a quadrupole electromagnet. It is a front side sectional view showing an example of a conventionally known deflection electromagnet. It is a schematic diagram which shows the example of a magnetic field distribution pattern in the gap of the deflection electromagnet shown in FIG.

A. First Embodiment of the Present Invention FIG. 1 is a front side sectional view showing a first embodiment of a variable magnetic field distribution type electromagnet system according to the present invention.

  A magnetic field distribution variable electromagnet system 1 shown in FIG. 1 includes a C-type first excitation unit 2 disposed on one side of a vacuum chamber 15 (see FIG. 2) constituting a ring, and the other side of the vacuum chamber 15. The C-type second excitation unit 3 disposed in the first and second excitation units 4 and the excitation power source 4 for exciting the first excitation unit 2 and the second excitation unit 3, respectively. The first excitation unit 2 is controlled to control the excitation direction, the excitation amount, the excitation direction of the second excitation unit 3, and the excitation amount. 5) and the second excitation unit 3 generates the second in-gap magnetic field lines 17 (see FIGS. 3 to 5) having the specified magnetic field distribution characteristics, so that the gaps 6 and 12 are generated. ,Designated Gap magnetic field lines with the field distribution characteristic 18 (refer to FIG. 3 to FIG. 5) to produce.

  The first excitation unit 2 has a first magnetic body 5 having a predetermined magnetic characteristic and made of a longitudinal magnetic material processed so as to have a C-shaped cross section, and an upper portion and a lower portion of the first magnetic body 5. A thick plate-shaped forward path excitation coil 7 disposed in the gap 6 formed therebetween, and a thin plate-shaped return path excitation coil 8 disposed in close contact with the surface other than the inner surface of the first magnetic body 5. The first excitation coil 9 is provided, and when the first excitation current is supplied from the excitation power supply 4, the first excitation coil 9 is excited to cause the first excitation current in the first magnetic body 5. The first magnetic field lines 16 in the gap 6 are generated in the gap 6 by generating magnetic field lines having the current direction, the direction corresponding to the current value, and the strength.

  The second excitation unit 3 is made of a longitudinal magnetic material having a predetermined magnetic characteristic, processed to have the same shape and size as the first magnetic body 5 and a C-shaped cross section. It is formed between the configured second magnetic body 10, a thin plate-like forward excitation coil 11 disposed so as to be in close contact with a surface other than the inner surface of the second magnetic body 10, and the upper and lower portions of the second magnetic body 10. And a second excitation coil 14 constituted by a thick plate-like return path side excitation coil 13 disposed in the gap 12, and when the second excitation current is supplied from the excitation power source 4, the second excitation coil 14 is provided. The coil 14 is excited to generate a magnetic field line having a direction and strength corresponding to the current direction of the second excitation current and the current value in the second magnetic body 10, and the magnetic field lines 17 in the second gap 17 in the gap 12. Is generated.

  Further, the excitation power source 4 generates a first excitation current having a current direction and a current value corresponding to an instruction from a ring control device (not shown) to excite the first excitation coil 9 to enter the gap 6. A first magnetic field line 16 having a specified magnetic flux density and magnetic field distribution is generated, and a second excitation current corresponding to an instruction from the ring control device is generated to excite the second excitation coil 14, thereby generating a gap 12. The magnetic field lines 17 in the second gap having the magnetic flux density and the magnetic field distribution specified in the inside are generated.

  Next, the operation of the magnetic field distribution variable electromagnet system 1 will be described with reference to the front sectional view shown in FIG. 2 and FIGS.

  First, as shown in FIG. 2, each end face of the first excitation unit 2 and each end face of the second excitation unit 3 are closely joined, and the first excitation unit 2 and the second excitation unit 3 are mechanically integrated. The vacuum chamber 15 is inserted into the gap 6 of the first excitation unit 2 and the gap 12 of the second excitation unit 3.

  Thereafter, when used as a two-pole deflection electromagnet, the excitation power source 4 generates a first excitation current having a current direction and a current value necessary for setting the excitation direction to the plus side and setting the excitation amount to 100%. The first excitation coil 9 of the first excitation unit 2 is excited. As a result, first in-gap magnetic field lines 16 having a first in-gap magnetic field distribution characteristic are generated in the gap 6 as shown in FIG.

  In parallel with this operation, the excitation power source 4 generates a second excitation current having a current direction and a current value necessary for setting the excitation direction to the plus side and setting the excitation amount to 100%. The second excitation coil 14 of the unit 3 is excited. As a result, magnetic field lines 17 in the second gap having the second magnetic field distribution characteristic in the gap 12 are generated.

  As a result, the first in-gap magnetic field lines 16 generated in the gap 6 of the first excitation unit 2 and the second in-gap magnetic field lines 17 generated in the gap 12 of the second excitation unit 3 are integrated. As shown in FIG. 3, the magnetic field lines 18 in the gap having uniform magnetic field distribution characteristics are generated as shown in FIG. 3, and the second excitation unit is formed in the gap 6 of the first excitation unit 2. The charged particles passing through the vacuum chamber 15 arranged in the gap 12 of the third are deflected in the right direction (or left direction).

  When used as a four-pole excitation electromagnet, the excitation power source 4 generates a first excitation current having a current direction and a current value necessary to make the excitation direction positive and the excitation amount to be 100%. The first excitation coil 9 of the first excitation unit 2 is excited. As a result, first in-gap magnetic field lines 16 having a first in-gap magnetic field distribution characteristic are generated in the gap 6 as shown in FIG.

  In parallel with this operation, the excitation power source 4 generates a second excitation current having a current direction and a current value necessary to set the excitation direction to the negative side and the amount of excitation to 100%, and the second excitation current is generated. The second excitation coil 14 of the unit 3 is excited. As a result, magnetic field lines 17 in the second gap having the second magnetic field distribution characteristic in the gap 12 are generated.

  As a result, the first in-gap magnetic field lines 16 generated in the gap 6 of the first excitation unit 2 and the second in-gap magnetic field lines 17 generated in the gap 12 of the second excitation unit 3 are integrated. As shown in FIG. 4, magnetic field lines 18 in the gap having an oblique gradient magnetic field distribution characteristic that is a quadrupole component are generated as shown in FIG. 4, and in the gap 6 of the first excitation unit 2, The charged particles that are disposed in the gap 12 of the second excitation unit 3 and pass through the vacuum chamber 15 converge in the central direction.

  When used as a function-coupled electromagnet, the excitation power source 4 generates a first excitation current having a current direction and a current value necessary for setting the excitation direction to the plus side and setting the excitation amount to 100%. The first excitation coil 9 of the first excitation unit 2 is excited. As a result, the first in-gap magnetic field lines 16 having the first in-gap magnetic field distribution characteristics are generated in the gap 6 as shown in FIG.

  In parallel with this operation, the excitation power source 4 generates a second excitation current having a current direction and a current value necessary for setting the excitation direction to the positive side and the excitation amount to be 50%. The second excitation coil 14 of the unit 3 is excited. Thereby, the magnetic field lines 17 in the second gap having the second magnetic field distribution characteristic in the gap 12 are generated.

  As a result, the first in-gap magnetic field lines 16 generated in the gap 6 of the first excitation unit 2 and the second in-gap magnetic field lines 17 generated in the gap 12 of the second excitation unit 3 are integrated. And a magnetic field line 18 in the gap having an oblique gradient magnetic field distribution characteristic is generated in the same manner as a function-coupled electromagnet in which a normal two-pole bending magnet and a four-pole magnet are combined as shown in FIG. The charged particles passing through the vacuum chamber 15 disposed in the gap 6 of the first excitation unit 2 and in the gap 12 of the second excitation unit 3 are converged while being deflected in the right direction.

  Thus, in the first embodiment, the excitation power source 4 controls the excitation direction and the excitation amount of the first excitation unit 2, the excitation direction and the excitation amount of the second excitation unit 3, and the first excitation unit 2 is controlled. In addition, the first magnetic field lines 16 having the designated magnetic field distribution characteristics are generated, and the second excitation magnetic field lines 17 having the designated magnetic field distribution characteristics are generated in the second excitation unit 3. Since the magnetic field lines 18 in the gap having the specified magnetic field distribution characteristics are generated, the magnetic field distribution of the magnetic field lines that adjust the trajectory of the charged particles is changed, and various deflection functions, various convergence functions, The number of types of electromagnets used in the ring can be greatly reduced, and the cost and size of the accelerator can be reduced. And advantages of the invention described in 3).

  Moreover, in this 1st form, since the 1st exciting coil 9 of the 1st exciting unit 2 and the 2nd exciting coil 14 of the 2nd exciting unit 3 are made to generate | occur | produce one magnetic field line 18 in a gap, Compared to the excitation coil provided in the conventional deflection electromagnet, the inductances of the first excitation coil 9 and the second excitation coil 14 can be halved, thereby reducing the response speed to 1 microsecond or less.

  Furthermore, in the first embodiment, the restriction of the maximum acceleration energy L caused by the restriction of the iron core such as the first magnetic body 5 and the second magnetic body 10 can be eliminated, and thereby a high energy particle beam accelerator such as a synchrotron While maintaining this function, the accelerator body can be made compact and the magnetic field distribution can be changed even during operation.

2. Second Embodiment of the Present Invention FIG. 6 is a front side sectional view showing a second embodiment of the variable magnetic field distribution type electromagnet system according to the present invention.

  The variable magnetic field distribution type electromagnet system 21 shown in FIG. 6 includes a first electromagnet unit 22, a second electromagnet unit 23, a third electromagnet unit 24, a fourth electromagnet unit 25, which are formed in a ¼ arc shape. And an excitation power source 26 for exciting the fourth electromagnet units 22 to 25 individually. Excitation current is supplied from the excitation power source 26 to the first to fourth electromagnet units 22 to 25 in response to an instruction signal from the accelerator controller. The magnetic field lines 35 (see FIG. 8) having the same magnetic field distribution characteristics as those of a normal octupole electromagnet or the magnetic field lines 35 (see FIG. 9) having the same magnetic field distribution characteristics as those of the quadrupole electromagnet are generated. The charged particles passing through the chamber 27 are converged.

  As shown in FIG. 7, each of the first to fourth electromagnet units 22-25 is made of a longitudinal magnetic material having two flat portions 28 and 29 formed on the inner surface side and a quarter arc shape on the outer surface side. A base magnetic body 30 having a predetermined magnetic characteristic, a first magnetic body 31 having an outer surface in close contact with the flat portion 28 of the base magnetic body 30, and a predetermined magnetic characteristic. The second magnetic body 32 is composed of a long plate-shaped magnetic material and the like, and the outer surface side is in close contact with the flat portion 29 of the base magnetic body 30, each side surface of the first magnetic body 31, and each of the second magnetic body 32. An “8” -shaped exciting coil 33 formed by being wound around a first magnetic body 31 and a second magnetic body 32 is provided so as to sequentially pass through the side surfaces.

  When using as an octupole electromagnet, the excitation power source 26 generates four excitation currents having current directions and current values necessary for setting the excitation direction to the negative side and the excitation amount to 100%. Each of the first electromagnet unit 22 to the fourth electromagnet unit 25 is excited. Thus, as shown in FIG. 8, adjacent magnetic field lines are branched between the first electromagnet unit 22 to the fourth electromagnet unit 25, and the magnetic field lines 35 having the same magnetic field distribution characteristics as a normal octupole electromagnet are formed in the cavity 34. Is generated to focus charged particles passing through the vacuum chamber 27.

  When used as a quadrupole electromagnet, the excitation power source 26 generates two excitation currents having a current direction and a current value necessary to set the excitation direction to the negative side and the excitation amount to 100%. While the 1 electromagnet unit 22 and the 3rd electromagnet unit 24 are excited, two excitation currents having a current direction and a current value necessary to make the excitation direction positive and the excitation amount to be 100% are generated. The second electromagnet unit 23 and the fourth electromagnet unit 25 are excited. As a result, as shown in FIG. 9, the magnetic field lines are made independent for each of the first electromagnet unit 22 to the fourth electromagnet unit 25, and the magnetic field lines 35 having the same magnetic field distribution characteristics as the normal quadrupole electromagnet are generated in the cavity 34. The charged particles passing through the vacuum chamber 27 are converged.

  As described above, in the second embodiment, in accordance with an instruction signal from the accelerator control device, an excitation current is supplied from the excitation power source 26 to the first to fourth electromagnet units 22 to 25, respectively, so that a normal octupole electromagnet is provided. The magnetic field lines 35 having the same magnetic field distribution characteristics or the magnetic field lines 35 having the same magnetic field distribution characteristics as the quadrupole electromagnet are generated. Magnetic field lines 35 having a magnetic field distribution characteristic can be generated, which can greatly reduce the number of types of electromagnets used in the ring, thereby achieving reduction in cost and size of the accelerator. And effects of the invention described in 5).

  Moreover, in this 2nd form, the exciting coil 33 of the 1st electromagnet unit 22-the exciting coil 33 of the 4th electromagnet unit 22 is excited individually, and the magnetic field line 35 of 4 poles or 8 poles is produced | generated in the cavity 34. As a result, the inductance of each excitation coil 33 can be reduced to ¼ or less compared to the excitation coil provided in the conventional converging electromagnet, thereby increasing the response speed by four times or more. Can do.

  Furthermore, in this 2nd form, the maximum acceleration energy L resulting from restrictions of iron cores, such as each base magnetic body 30, each 1st magnetic body 31, and each 2nd magnetic body 32 of the 1st-4th electromagnet units 22-25. Thus, the accelerator body can be made compact while maintaining the function of a high-energy particle beam accelerator such as a synchrotron, and the magnetic field distribution can be changed even during operation.

  The present invention relates to an electromagnet system used in a particle beam accelerator and the like, and in particular, it enables multi-functionalization of a high energy particle beam accelerator for the purpose of elementary particle experiment, nuclear experiment, medical use (radiotherapy), etc. It contributes to the heavy ion accelerator, which is a step toward mass production of nanomaterials for bulk processing, and has industrial applicability.

1: Electromagnetic system with variable magnetic field distribution 2: First excitation unit (excitation unit)
3: Second excitation unit (excitation unit)
4: Excitation power supply 5: First magnetic body (C-shaped magnetic body)
6: Gap 7: Outward side exciting coil 8: Inward side exciting coil 9: First exciting coil (exciting coil)
10: Second magnetic body (C-shaped magnetic body)
11: Outward side exciting coil 12: Gap 13: Return side exciting coil 14: Second exciting coil (exciting coil)
15: Vacuum chamber 16: Magnetic field lines in the first gap 17: Magnetic field lines in the second gap 18: Magnetic field lines in the gap 21: Electromagnetic system with variable magnetic field distribution 22: First electromagnetic unit (excitation unit)
23: Second electromagnet unit (excitation unit)
24: Third electromagnet unit (excitation unit)
25: Fourth electromagnet unit (excitation unit)
26: Excitation power supply 27: Vacuum chamber 28: Plane portion 29: Plane portion 30: Base magnetic body (arc-shaped magnetic body)
31: 1st magnetic body (arc-shaped magnetic body)
32: Second magnetic body (arc-shaped magnetic body)
33: Excitation coil 34: Cavity (circular space)
35: Magnetic field lines

Claims (4)

In an electromagnet system that generates magnetic field lines and controls the trajectory of charged particles,
A plurality of excitation units arranged to surround a vacuum chamber serving as a passage for charged particles;
For each of the excitation unit, designated current direction, and generates an excitation current of a current value, each said respective excitation unit, and a excitation power source to be excited,
Each of the excitation units has a C-shaped magnetic body, and an excitation coil that generates lines of magnetic force in the magnetic body when an excitation current is supplied from the excitation power source,
In order to surround the vacuum chamber, one end of the excitation unit and the other end of the excitation unit are arranged opposite to each other,
By controlling the excitation current supplied from the excitation power source to one of the excitation units and the excitation current supplied to the other excitation unit, the magnetic field lines in the gap generated by the one excitation unit and the other excitation unit are controlled. A magnetic field distribution variable electromagnet system characterized by controlling a magnetic field distribution. The variable magnetic field distribution type electromagnet system according to claim 1 ,
The excitation power supply adjusts the current direction and current value of the excitation current supplied to one of the excitation units and the other of the excitation units, and has a dipole magnetic field distribution characteristic, quadrupole within the gap of each excitation unit. A magnetic field distribution variable electromagnet system characterized by generating magnetic field lines corresponding to either a magnetic field distribution characteristic or a function-coupled magnetic field distribution characteristic. The variable magnetic field distribution type electromagnet system according to claim 1,
Each of the excitation units is an arc-shaped magnetic body in which two protrusions are formed on the inner surface side, each of the protrusions is wound in an “8” shape, and when an excitation current is supplied from the excitation power source, Each of the protrusions includes an exciting coil that generates a line of magnetic force in the magnetic body,
Each of the excitation units is arranged in a circle so as to surround the vacuum chamber and so that adjacent ends of the ends of the excitation units are in close contact with each other or close to each other.
A magnetic field characterized in that an excitation current supplied to each excitation unit from the excitation power source is controlled to control a magnetic field distribution of magnetic lines generated in a circular space defined by each excitation unit. Variable distribution type electromagnet system. The magnetic field distribution variable electromagnet system according to claim 3 ,
The excitation power source adjusts the current direction and the current value of the excitation current supplied to each excitation unit, and the octupole magnetic field distribution characteristic or quadrupole is set in the circular space defined by each excitation unit. A magnetic field distribution variable electromagnet system characterized by generating magnetic field lines corresponding to any of the magnetic field distribution characteristics.

Images