JP2006339493A - Magnetic force field generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To apply a proper magnetic force field to each test piece while enabling the simultaneous operation of the test pieces at a plurality of places to improve efficiency in operation such as an experiment. <P>SOLUTION: In an inner space 16 surrounded by a superconducting coil 12 and its holding members 10 and 14, a plurality of sets of units U1 to U4 for reinforcing the magnetic force field are arrayed in an axial direction. The respective units U1 to U4 surround a test piece space 20 with an annular body 22 and a disk-like body 24 composed of a material for reinforcing the magnetic force field. Moreover, parameters different from one another between units are set with respect to the parameters of the annular body 22 and the disk-like body 24 (a shape, a quality of the material, and a relative position between the annular body 22 and the disk-like body 24) in the units U1 to U4, so that the intensity of the magnetic force field in the test piece space 20 in each unit U1 to U4 may be nearly equal without regard to a direction in the axial direction of the inner space 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for generating a strong magnetic force field for the purpose of realizing a microgravity environment on the ground, and in particular, protein crystal growth, alloys, drugs, etc. using the microgravity environment. It is useful for the purification of.

  Conventionally, a superconducting magnet device having a hollow superconducting coil has been known as a means for generating a strong magnetic force field as described above in a relatively small-scale facility. As means for enhancing the magnetic field, it is known to add a disk-like body or an annular body (ring-shaped body) made of a ferromagnetic material to the axial center portion of the superconducting coil, that is, the inner space (Patent Document 1).

  However, if an annular body or a disk-shaped body made of a ferromagnetic material as described above is added alone to the inner space of the superconducting coil, the uniformity of the magnetic force field is impaired, and in the space where the sample is set (sample space) There is a disadvantage that it is extremely difficult to form a uniform magnetic force field in the axial direction. For example, as shown by a two-dot chain line in FIG. 6, even if the coil is designed so that the magnetic force field formed by the superconducting magnet is uniform in the axial direction, an annular body made of the ferromagnetic material is added thereto. As a result, a large magnetic field gradient is generated in the sample space as shown by a one-dot chain line in the figure, and when the disc-shaped body made of the ferromagnetic material is added to the superconducting magnet, the magnetic field gradient as shown by the broken line in the figure. A magnetic field gradient opposite to that is generated in the sample space.

As means for solving such inconvenience, in Patent Document 2, as shown in FIG. 7, an annular body 102 and a disk-like body 104 made of a ferromagnetic material are arranged in the axial direction in the inner space inside the superconducting coil 100. Disposition is disclosed. According to such an arrangement, the effect of the annular body 102 on the magnetic force field and the influence of the disk-like body 104 on the magnetic force field are combined to generate magnetism in the sample space as shown by the solid line in FIG. As the gradient of the force field is eliminated, the strength (absolute value) of the magnetic force field is greatly increased.
JP 2000-77225 A Japanese Patent No. 3532888

  In the apparatus described in Patent Document 2, since there is basically only one sample space for one apparatus, only one sample can be experimented at a time, which hinders improvement in work efficiency. . In particular, in the case of an application that requires a long time to process one sample, the situation becomes more serious.

  For example, when a protein crystal is grown using the above apparatus and X-ray diffraction is performed, it takes a period of several days to 1 to 2 weeks to perform the growth using a superconducting magnet apparatus. Yes, how to efficiently perform the growth is a major issue. Further, in X-ray diffraction of the protein crystal, it is desirable to simultaneously grow a protein crystal in a plurality of samples, select the best quality from among them, and perform X-ray diffraction. In order to realize the simultaneous processing by the conventional apparatus, a plurality of such apparatuses must be installed, and the equipment cost and installation space are inevitably increased.

  Note that FIG. 9 of Patent Document 2 describes that the set of the annular body and the disk-like body is arranged symmetrically in the vertical direction, but this configuration is due to the addition of a ferromagnetic material to the superconducting magnet. The purpose is to cancel the additional electromagnetic force, and not to simultaneously process a plurality of samples. Even if the sample space can be secured vertically in the same configuration, the formation positions and number of the sample spaces are very limited, and the degree of freedom in design is low.

  In view of such circumstances, the present invention enables simultaneous sample manipulation at a plurality of locations and enhances work efficiency such as experiments, and can provide an appropriate magnetic force field for each sample, And it aims at providing the apparatus with a high design freedom of a sample space formation location and number.

  As means for solving the above problems, the present inventors form a sample space in each unit by arranging a plurality of units in which the annular body and the disk-shaped body are combined in the inner space of the coil holding member. I thought of that. However, since the strength of the magnetic force field in the inner space differs depending on the position in the axial direction, the strength of the magnetic force field in the sample space varies depending on the position of the unit simply by arranging a plurality of sets of the units. Therefore, it is not possible to conduct a simultaneous experiment on a plurality of samples under substantially the same conditions. In addition, it is conceivable to design a superconducting coil so that the strength of the magnetic force field is made uniform among the units, but this is not easy to realize.

  The present invention has been made under such a background, and a superconducting coil wound in a hollow, and a coil holding member that surrounds an inner space along the central axis of the superconducting coil and holds the superconducting coil. And a magnetic force field generator configured to generate a magnetic force field in the sample space in the inner space by energization of the superconducting coil, wherein at least one of the inner spaces has an axial intermediate position as a boundary. An annular body made of a material that reinforces the magnetic force field formed by the superconducting coil and a disk-like body made of a material that reinforces the magnetic force field formed by the superconducting coil from the intermediate position in the axial direction. A plurality of units arranged in parallel in a distant order are arranged in the axial direction of the inner space at a position coaxial with the superconducting coil, and each unit has its annular body and disk-shaped body. At least one of the following parameters a, b, and c, so that the strength of the magnetic force field in the sample space formed in each of these units is substantially the same. Different parameters are set between units for one parameter.

  a. The shape of at least one of an annular body and a disk-shaped body constituting each unit.

  b. Relative position of the annular body and disk-shaped body constituting each unit.

  c. A material of at least one of an annular body and a disk-shaped body constituting each unit.

  Here, the annular body and the disc-shaped body are the same as the magnetic force field formed by a ferromagnetic material, a permanent magnet magnetized in the same direction as the magnetic force field formed by the superconducting coil, or the superconducting coil. A superconducting bulk body magnetized in the direction is suitable.

  According to the above configuration, a plurality of units are arranged in at least one region with an axial intermediate position as a boundary, and a sample space surrounded by the annular body and the disk-like body is formed in each unit. In addition, different parameters (at least one of shape, relative position, and material) are set for the annular body and the disk-shaped body in each unit so that the strength of the magnetic force field in the sample space is almost the same. Therefore, it is possible to conduct experiments on a plurality of samples simultaneously with one apparatus. Moreover, since the strength of the magnetic force field is made uniform by setting the parameters of the annular body and disk-shaped body of each unit directly surrounding the sample space, the magnetic force field strength can be increased by, for example, changing the design of the superconducting coil. This can be realized more easily than in the case of achieving uniformization.

  In addition, the magnetic field strength in each sample space is made uniform by setting the parameters of the annular body and the disk-like body regardless of the arrangement position of the unit. It is possible to freely set the number, for example, it is possible to provide three or more units that form the sample space (that is, to form three or more sample spaces).

  As a specific setting method of the parameters, the materials of the annular body and the disk-shaped body in each unit are all the same, and the strength of the magnetic force field in the sample space formed in each of these units is all It is preferable to set different parameters between units for at least one of the parameters a and b so as to be substantially the same.

  According to this configuration, the material of each annular body and the disk-shaped body is made common and the productivity is maintained high, and at least one of the shape and relative position of the annular body or the disk-shaped body is made while facilitating the design. By making the units different from each other, the magnetic force field can be made uniform.

  More specifically, the larger the distance from the axial intermediate position of the inner space of the unit, the larger the outer diameter of the disk-like body and the inner diameter of the annular body in the unit, or the inner space of the unit. What is necessary is just to set large the axial direction distance of the disk-shaped body and annular body in the said unit, so that the distance from an axial direction intermediate position is large.

  The annular body and the disk-shaped body in each unit may be held together in a common container or the like, but both the annular body and the disk-shaped body constituting the unit for each unit are in a specific relative position. If a holding body that holds the relationship is maintained, the unit can be handled more easily. For example, by assembling an annular body and a disk-shaped body for each unit and then combining these units, the assembly work can be facilitated, and the sample can be set in the sample space for each unit. Setting work is also easy.

  In particular, in the case of an apparatus installed so that the central axis of the superconducting coil is directed in the vertical direction, the units can be stacked on each other in the axial direction of the inner space of the superconducting coil, resulting in a simpler structure. In addition, the units can be arranged with a simple operation.

  Further, the unit includes a plurality of units arranged in a region above the intermediate position in the axial direction in the inner space, and in these units, the disk-like shape passes through the inner side of the annular body. If the annular body and the disk-shaped body are held at a position where the sample can be placed on the body, the sample can be sampled with a simple structure by simply placing the sample on the disk-shaped body. It becomes possible to set in the space.

  In addition, a suspension support member that can be inserted into the inner space together with the units from above and that supports the units in a suspended state while being locked to the upper end of the coil holding member is provided. By doing so, it becomes possible to introduce and take out a plurality of units together with the suspension support member from the inner space of the coil holding container.

  In the present invention, each unit is disposed at a position that is mutually symmetrical in the axial direction across the axial intermediate position of the inner space, and each unit in at least one region with the axial intermediate position as a boundary, respectively. More preferably, the sample space is formed. With the arrangement of such units, the force applied to the device due to the influence of the magnetic field by the unit on one side across the intermediate position in the axial direction is balanced with the force applied to the device due to the magnetic field by the other unit. , The strength burden on the device can be reduced.

  As described above, according to the present invention, a plurality of units in which an annular body and a disk-like body surrounding the sample space are arranged in parallel in the inner space of the coil holding member are arranged in a single device. By setting parameters such as the shape of the annular body and disk in each unit so that the sample space can be formed and the strength of the magnetic force field in each sample space is made uniform, There is an effect that experiments on a plurality of samples can be performed simultaneously under substantially the same conditions in the sample space.

  A first embodiment of the present invention will be described with reference to FIGS.

  The apparatus shown in the figure includes a cold storage container 10 that stores a refrigerant such as liquid helium, and a superconducting coil 12 and its winding frame 14 are stored in the cold storage container 10.

  The cold insulation container 10 contains a refrigerant for cooling the superconducting coil 12 and has a donut shape having an inner space 16 along the central axis of the superconducting coil 12. The winding frame 14 also has a donut shape that can be accommodated in the cold insulation container 10, and the superconducting coil 12 is configured by winding a superconducting wire around the winding frame 14. It is fixed in place. Therefore, in this embodiment, the cold insulation container 10 and the winding frame 14 correspond to a coil holding member that holds the superconducting coil 12.

  As a feature of this apparatus, four sample spaces 20 to be described later are formed in a region above a plane (hereinafter referred to as “equator plane”) 18 crossing an intermediate position in the axial direction (vertical direction in the illustrated example). Units U1, U2, U3, and U4 are arranged in the axial direction in order from the bottom.

  As shown to Fig.3 (a), each unit U1-U4 is provided with the annular body 22 and the disk shaped body 24, and the annular spacer 26 and the holding block 28 which are the holding body.

  The disk-shaped body 24 has a low-profile columnar shape, and the annular body 22 has a circular shape with a circular through hole provided at the center of the low-profile cylinder. The shape is set so that the outer diameter of 24 is substantially equal. Both the annular body 22 and the disk-shaped body 24 are made of a material that enhances the magnetic force field formed when the superconducting coil 12 is energized.

  Specifically, as the annular body 22 and the disk-shaped body 24, 1) a ferromagnetic body such as pure iron, iron alloy, nickel, nickel alloy, etc., 2) a magnetic force field formed by a superconducting coil which is a permanent magnet. 3) A superconducting bulk body made of bismuth-based oxide, yttrium oxide, etc. and magnetized in the same direction as the magnetic force field formed by the superconducting coil is suitable. is there. In the case of using a permanent magnet or a magnetized superconducting bulk material, for example, the magnetic poles may be set so that the S pole is upward and the N pole is downward as shown in FIG.

  The annular spacer 26 has substantially the same shape as the annular body 22 and is disposed so as to be interposed between the annular body 22 and the disc-like body 24 so as to maintain the relative positional relationship between the two in the vertical direction. The

  The holding block 28 has an outer diameter slightly smaller than the inner diameter of the inner space 16 of the cold container 10 and has a structure for holding the annular body 22, the disk-like body 24, and the annular spacer 26 together. ing. Specifically, a concave portion 28a into which the annular body 22 and the annular spacer 26 are loaded without a gap is formed in the central upper portion of the holding block 28. Further, the disk-like body 24 is formed at the center of the bottom of the concave portion 28a. Has a recess 28b into which is inserted.

  The holding block 28 and the annular spacer 26 hold the annular body 22 and the disk-like body 24 at positions that are coaxial with each other, and are located radially inside the annular body 22 and the annular spacer 26 and the disk-like body. A sample space 20 in which the sample SM can be placed is formed in the upper region of 24. In this embodiment, the height dimension of the annular spacer 26 and the depth dimension of the recess 28 a are set so that the upper surface of the annular body 22 is slightly higher than the upper surface of the holding block 28.

  The material of the annular spacer 26 and the holding block 28 is preferably a non-magnetic material that does not affect the magnetic force field in the sample space. Specifically, non-magnetic stainless steel, aluminum, aluminum alloy, FRP Etc. are suitable.

  Next, an assembly structure of the units U1 to U4 to the apparatus will be described. In this embodiment, as shown in FIGS. 1 and 3B, the units U1 to U4 are stacked from the bottom in that order (that is, the upper and upper surfaces of the disk-like body 24 in the lower unit). In a state in which the lower surface of the holding block 28 of the unit is in contact, the suspension support member 30 is suspended and supported in the inner space 16.

  Specifically, a plurality of screw rod insertion holes 28c penetrating the block 28 in the thickness direction (vertical direction) are arranged in the outer peripheral portion of the holding block 28 in each of the units U1 to U4 in the circumferential direction. The lowering support member 30 includes a plurality of screw rods 32 inserted into the screw rod insertion holes 28c, a presser plate 34, and a locked plate 36. The holding plate 34 has a disk shape having a plane shape substantially equivalent to each holding block 28, and the locked plate 36 has a disk shape that is slightly larger than the inner space 16. Are provided with through holes through which the respective screw rods 32 can be inserted.

  By using the suspension support member 30 and the units U1 to U4, for example, a plurality of sample spaces 20 and a set of samples SM can be formed in the inner space 16 of the cold storage container 10 in the following manner.

  1) The disk-like body 24, the annular spacer 26, and the annular body 22 are sequentially fitted into the holding block 28 of each unit U1 to U4, and the unit is assembled.

  2) The sample SM is placed on the disk-like body 24 so that the sample SM is inserted from above into the annular body 22 and the annular spacer 26 of each unit U1 to U4.

  3) In a state where the units U1 to U4 are stacked and the presser plate 34 is placed thereon, screws are inserted into the screw rod insertion holes 28c of the holding block 28 and the through holes of the presser plate 34 of the units U1 to U4. The holding plate 34 and the units U1 to U4 are sandwiched from above and below by a nut 38 that is inserted into the rod 32 and screwed to the screw rod 32, thereby holding the units U1 to U4 in a stacked state.

  4) The locked plate 36 is fixed to the upper end of each screw rod 32 by a nut 38, and the units U1 to U4 are inserted into the inner space 16 from above, while the locked plate 36 is By placing the outer peripheral portion on the upper surface of the cold container 10, the units U <b> 1 to U <b> 4 are suspended in the inner space 16 together with the suspension support member 30 as shown in FIG. 1.

  Through the above steps, the sample spaces 20 of the units U1 to U4 are arranged in the axial direction in the inner space 16 and the sample SM is set in each sample space 20 by a simple operation. Can do.

  Further, as a feature of this apparatus, the magnetic force in the sample space 20 secured in each of the units U1 to U4, that is, the space surrounded by the annular body 22 and the disk-shaped body 24 and loaded with the sample SM. The shapes of the annular body 22 and the disk-shaped body 24 in each of the units U1 to U4 are set so that the field strengths are substantially equal.

  Thus, in order to make the strength of the magnetic force field in the sample space 20 in each of the units U1 to U4 substantially uniform regardless of the position in the axial direction of the units U1 to U4, from the equatorial plane 18 of the unit. The larger the distance (that is, the distance from the intermediate position in the axial direction), the larger the inner diameter of the annular body 22 and the outer diameter of the disk-shaped body 24 in the unit. The optimum shape can be determined by 1) simulation, or 2) by actually producing various samples and setting the final shape while interpolating by trial and error. In any case, the position where each unit is arranged is first determined, and the distribution of the magnetic force field is numerically calculated while changing the parameters (the inner and outer diameters and heights of the annular body 22, the height of the disk-like body 24, etc.). Thus, it is only necessary to find the final value of the parameter that provides the required magnetic force field at the position.

  Further, as a means for making the magnetic force field uniform, the axial distance between the annular body 22 and the disk-like body 24 in each of the units U1 to U4 is the distance from the equator plane 18 of the unit (that is, the axial middle). It is also effective to set a larger value as the distance from the position increases. Further, if both the shape and the relative position of the annular body 22 and the disk-shaped body 24 are made different between the units, the difference between the units with respect to the shape and the relative position is kept small, and the magnetic force field is reduced. Uniformity can be realized. An example of the setting will be described in detail in the section of the later embodiment.

  According to the apparatus described above, experiments and the like for a plurality of samples SM can be simultaneously performed under substantially the same conditions by changing only the parameters of the annular body 22 and the disk-shaped body 24 constituting each unit U1 to U4. This makes it possible to dramatically increase the efficiency of the experiment and the like.

  Further, as shown in FIG. 4 as a second embodiment, the units U1 ′, U2 ′, U3 are axially symmetrical with the units U1, U2, U3, U4 with the equator plane 18 in between. By arranging ', U4', the force applied to the apparatus due to the influence of the magnetic field by the units U1 to U4 and the force applied to the apparatus due to the influence of the magnetic field by the other units U1 'to U4' can be balanced. It is possible to effectively reduce the burden of strength.

  In this case, for example, the units U1 'to U4' may be introduced only for the purpose of ensuring the balance, not for the purpose of forming the sample space, or for the units U1 'to U4'. You may make it do. Thus, in the present invention, not all of the units included in the apparatus need to form the sample space, and there are a plurality of units that form the sample space in at least one region across the intermediate position in the axial direction. What is necessary is just to be arranged.

  In addition, the present invention can take the following embodiments, for example.

  In the present invention, it is possible to make the magnetic force field uniform between the units by making the materials of at least one of the annular body and the disk-shaped body constituting the units different from each other. However, as described above, the material of each annular body and disk-shaped body is all the same, but if a method is adopted in which at least one of the shape and relative position is different between units, the use of the common material makes the design easier. In addition, the productivity of each annular body and disk-shaped body can be maintained high.

  In the present invention, it is possible to make the magnetic force field uniform even if only one of the annular body and the disk-shaped body constituting each unit is made to have a different shape or material. . For example, the shape and material of the annular body of each unit may all be the same, but only the shape or material of the disk-shaped body may be different between the units.

  In the present invention, it is possible to freely set the position and number of units. Further, the units do not necessarily have to be stacked as illustrated, and may be arranged intermittently.

  In the illustrated example, each unit is provided with a holding body (annular spacer 26 and holding block 28) that holds the annular body 22 and the disk-like body 24. However, the annular body and the disk-like shape in a plurality of units are provided. The body may be held together in a common container or the like. However, if the structure is such that the holding body is divided for each of the units U1 to U4 as shown in the drawing, it is possible to make the assembling work and the sample setting work easier in the manner described above.

  Even when the holding body is divided for each unit, the specific structure is not limited. For example, the annular body 22 and the disk-shaped body 24 and a resin-made holding body for holding the annular body 22 and the disk-shaped body 24 can be integrally molded.

  -In this invention, the installation attitude | position of the whole apparatus is not ask | required in particular, For example, it can apply also to the horizontal installation type installed so that the central axis of the said superconducting coil may face a horizontal direction. Here, in an apparatus installed so as to face in the vertical direction, as shown in FIGS. 3 (a) and 3 (b), etc., the units can be simply structured by simply stacking the units up and down, and with simple work. Arrangement becomes possible. In particular, if the sample SM is placed on the disc-like body 24 through the inside of the annular body 22 as shown in the figure, the sample can be set in the sample space with a simpler structure. become.

  In the present invention, the support structure of the unit is not particularly limited. For example, when a plurality of units are arranged in a region below the equator plane 18 shown in the figure, these units may be stacked on a base having a predetermined height and arranged in the inner space 16. .

  In the apparatus shown in FIGS. 1 to 3, the inner space 16 is a room-temperature cylindrical space having a diameter of 100 mm, and a superconducting magnet having the ability to generate a magnetic force field having a strength of 13 T in the inner space 16 is used. The specifications are shown in Table 1. In this embodiment, an experiment is performed using six types of superconducting magnets having the same strength of the generated magnetic force field regardless of the coil size and the number of turns.

  In this superconducting magnet, four units U1, U2, U3, U4 are arranged in order from the bottom as shown in FIG. 1, and the annular body 22 and the disk-like body 24 of each unit U1-U4 are all made of pure iron. At the same time, the optimum dimensions of the annular body 22 and the disk-shaped body 24 and the axial distance between the annular body 22 and the disk-shaped body 24 are set according to the position of the unit in the axial direction. An example of the dimension setting is shown in Table 2, and the characteristics of the magnetic force field (relationship between the axial position in the inner space 16 and the magnetic force field strength) obtained by the dimension setting are shown in FIG. In FIG. 5, the broken line indicates the magnetic force field characteristics of only the superconducting magnet, and the solid line indicates the magnetism of the apparatus in which the four units U1 to U4 having the annular body 22 and the disk-like body 24 having the dimensions are added to the superconducting magnet. The force field characteristics are shown.

As apparent from FIG. 5, the superconducting magnet alone can generate only a magnetic force field having a strength of 585 T ² / m at the maximum, whereas the units U 1 to U 4 are added and each unit U 1 If the dimensions of the annular body 22 and the disk-shaped body 24 in .about.U4 and the axial distance between the annular body 22 and the disk-shaped body 24 are set as shown in Table 2, all of the four sample spaces 20 are 1400 T ² / It becomes possible to form a strong magnetic force field of m. Therefore, according to this apparatus, it is possible to apply a strong and uniform magnetic force field to the four samples SM at the same time, and thereby it is possible to dramatically improve the experimental efficiency.

1 is a cross-sectional front view of a magnetic force field generator according to a first embodiment of the present invention. It is a partial cross section perspective view which shows the outline of the said magnetic force field generator. (A) is a sectional front view which shows the structure of each unit with which the said magnetic force field generator is equipped, (b) is a sectional front view which shows the suspension support structure of these units. It is a cross-sectional front view of the magnetic force field generator which concerns on the 2nd Embodiment of this invention. It is a graph which shows the relationship between the axial direction position of the inner space of the magnetic force field generator in the Example of this invention, and magnetic force field strength. It is a graph which shows the magnetic force field characteristic in the apparatus which added the ferromagnetic material of the superconducting magnet single-piece | unit and various shapes to this. It is a partial cross section perspective view which shows the example of the conventional magnetic force field generator.

Explanation of symbols

10 Cold storage container (coil holding member)
12 Superconducting coil 14 Winding frame (coil holding member)
16 Inner space 18 Equatorial plane 20 Sample space 22 Annular body 24 Disc-shaped body 26 Annular spacer (holding body)
28 Holding block (holding body)
30 Suspension support member U1-U4, U1'-U4 'Unit SM Sample

Claims (11)

A superconducting coil wound in a hollow and a coil holding member that surrounds the inner space along the central axis of the superconducting coil and holds the superconducting coil, and energizes the superconducting coil in the sample space in the inner space. In the magnetic force field generator configured to generate a magnetic force field, the magnetic force field formed by the superconducting coil is enhanced in at least one region of the inner space with the axial intermediate position as a boundary. A unit in which an annular body made of a material and a disk-like body made of a material that reinforces a magnetic force field formed by the superconducting coil are arranged side by side in the order of distance from the intermediate position in the axial direction is at a position coaxial with the superconducting coil. A plurality of sets are arranged in the axial direction of the inner space to form a sample space surrounded by the annular body and the disk-shaped body in each unit, and these Different parameters are set between the units for at least one of the following parameters a, b, and c so that the strength of the magnetic force field in the sample space formed on each knit is substantially the same. A magnetic force field generator characterized by comprising:
a. The shape of at least one of an annular body and a disk-shaped body constituting each unit.
b. Relative position of the annular body and disk-shaped body constituting each unit.
c. A material of at least one of an annular body and a disk-shaped body constituting each unit.   2. The magnetic force field generator according to claim 1, wherein the materials of the annular body and the disk-shaped body in each unit are all the same, and the strength of the magnetic force field in the sample space formed in each of these units. Are set to be substantially the same, at least one of the parameters a and b is set to a different parameter between the units.   3. The magnetic force field generating device according to claim 2, wherein the outer diameter of the disk-shaped body and the inner diameter of the annular body in the unit are set larger as the distance from the intermediate position in the axial direction of the inner space of the unit is larger. Magnetic force field generator characterized by the above.   4. The magnetic force field generator according to claim 2 or 3, wherein the larger the distance from the intermediate position in the axial direction of the inner space of the unit, the larger the axial distance between the disc-shaped body and the annular body in the unit. A magnetic force field generator characterized by comprising:   5. The magnetic force field generator according to claim 1, further comprising three or more units that form the sample space.   6. The magnetic force field generator according to claim 1, wherein the annular body and the disk-shaped body of each unit are magnetized in the same direction as a magnetic force field formed by a ferromagnetic body and the superconducting coil. A magnetic force field generating device, which corresponds to any one of a superconducting bulk body magnetized in the same direction as a magnetic force field formed by the permanent magnet and the superconducting coil.   The magnetic force field generation device according to any one of claims 1 to 6, wherein each unit holds an annular body and a disk-shaped body constituting the unit so that both maintain a specific relative positional relationship. A magnetic force field generator comprising:   8. The magnetic force field generating device according to claim 7, wherein the superconducting coils are arranged such that a central axis thereof is oriented in the vertical direction, and the units are stacked in the axial direction of the inner space of the superconducting coil. The magnetic force field generator characterized by being arranged.   The magnetic force field generation device according to claim 8, wherein the unit includes a plurality of units arranged in a region above the intermediate position in the axial direction in the inner space, and in these units, An apparatus for generating a magnetic force field, wherein the annular body and the disk-like body are held at a position where a sample can be placed on the disk-like body through the inside of the annular body. The magnetic force field generator according to claim 8 or 9, wherein each unit is suspended in a state that it can be inserted into the inner space together with the units from the upper side and is locked to an upper end of the coil holding member. A magnetic force field generator comprising a suspension support member that supports a suspended state.   The magnetic force field generation device according to any one of claims 1 to 10, wherein the units are arranged at positions that are symmetrical with each other in the axial direction with respect to an intermediate position in the axial direction of the inner space, and the axis. The magnetic force field generating apparatus according to claim 1, wherein the sample space is formed in each unit in at least one region with a direction intermediate position as a boundary.

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