JP3829169B2 - Central solenoid coil support device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a support device for a central solenoid coil applied to a nuclear fusion device.
[0002]
[Prior art]
In general, as shown in FIG. 10, a nuclear fusion apparatus includes a first wall 2, a bracket 3, and a diverter 4 that surround and form a doughnut-shaped plasma 1, and encloses the outside of the diverter 4 and the like to increase the inside. And a vacuum vessel 5 for maintaining a vacuum.
[0003]
In addition, the fusion apparatus radially arranges the toroidal magnetic field coils 6 that generate the magnetic field and confine the plasma 1 toward the outside of the vacuum vessel 5, and the poloidal magnetic field coil 7 along the circumferential direction outside the vacuum vessel 5. On the other hand, a cryostat 8 that covers all the components such as the toroidal magnetic field coil 6 and the poroidal magnetic field coil 7 is provided.
[0004]
A central solenoid coil 9 that induces an electric current in the plasma 1 and heats the plasma 1 in an initial process is provided on the plasma central axis CL of the nuclear fusion apparatus having such a configuration. The central solenoid coil 9 is formed of a superconductor, and a toroidal magnetic field coil 6 is disposed in an adjacent region outside the space, so that the space is narrowed. However, in consideration of the fact that this narrow space area has a low magnetic field and it is convenient to provide a crossover between coils and a lead-out part, it is necessary to ensure a certain distance. The For this reason, the center solenoid coil 9 employs the support device shown in FIGS. 11 to 13 so as to ensure a certain distance even in a narrow space with the toroidal magnetic field coil 6. 11 is a schematic assembly view of the support structure of the central solenoid coil, FIG. 12 is a perspective view of FIG. 11, and FIG. 13 is a partially enlarged view of a portion X in FIG.
[0005]
As shown in FIG. 11, the central solenoid coil supporting device is formed by stacking a ring-shaped solenoid coil A, solenoid coil B,... The coils B,... Are provided with closing plates 11a and 11b as shown in FIG. 12 at the bottom and the head of the cylindrical body 10, and the closing plates 11a and 11b are arranged in an annular row around the solenoid coil. 12 is fixed and supported, and as shown in FIG. 13, a ring-shaped solenoid coil A, solenoid coil B,... Are supported.
[0006]
Thus, in the conventional central solenoid coil support device, the solenoid coil A, solenoid coil B,... Are stacked along the cylinder axis outside the cylindrical body 10, and the stacked solenoid coil A, solenoid coil B,. The superconducting solenoid coils A, B... Are compactly arranged with respect to the central axis of the plasma 1.
[0007]
[Problems to be solved by the invention]
Generally, the support device for the central solenoid coil requires the following technical matters in designing.
[0008]
(1) The support device for the central solenoid coil is capable of following the thermal contraction of the solenoid coil during the refrigeration operation, and that the solenoid coil is subjected to a compressive load so that the alignment arrangement of the solenoid coil at the time of design can be maintained. Needed.
[0009]
(2) The toroidal coil side of the central solenoid coil requires a certain space portion in order to secure a lead-out portion and a connecting wire of the solenoid coil. For this reason, the support device for the central solenoid coil is required to have a structure capable of accommodating and arranging the central solenoid coil in a compact manner.
[0010]
(3) The support device for the central solenoid coil is required to have a structure that can be easily disassembled and assembled because it is installed in a narrow place.
[0011]
(4) The support device for the central solenoid coil is required to be electrically insulated in the toroidal direction.
[0012]
(5) The support device for the central solenoid coil has a structure that can cope with the heat shrinkage because the heat shrinkage generated during the freezing operation of the solenoid coil is severe. Further, in addition to the above-described thermal contraction, electromagnetic force Fr, Fz acts on the solenoid coil at the time of excitation in the radial direction and the axial direction, respectively, and an unbalanced force received from the toroidal coil or plasma is generated. For this reason, the support device for the central solenoid coil is required to have a structure that sufficiently resists these forces.
[0013]
The central solenoid coil supporting device has the following problems when compared with the above-described design requirements and the conventional one shown in FIGS.
[0014]
(1) During the freezing operation, the amount of heat shrinkage of the solenoid coil is larger than the amount of heat shrinkage of the support device for the central solenoid coil. Therefore, when assembling the solenoid coil to the support device for the center solenoid coil, use a hydraulic jack or the like in advance. Assembly work was performed after applying a compressive load in the axial direction of the solenoid coil.
[0015]
However, because the amount of heat shrinkage of the solenoid coil is large, the preliminary compression force by a hydraulic jack or the like is not sufficient. Actually, during the freezing operation, the solenoid coil is pulled between the support device (on the support device side). / There is a problem that the compression (solenoid coil side) load is greatly reduced and loosened, or a gap is generated, and the function of supporting the coil of the supporting device cannot be achieved. In particular, during operation, an unbalanced force acts on the solenoid coil in addition to the electromagnetic force Fz in the axial direction. For this reason, if there is a gap between the solenoid coil and the support device, the unbalanced force becomes an impact load depending on the operating state of the fusion device, and there is a concern that the strength of the support device cannot be maintained high.
[0016]
(2) A conventional solenoid coil support device is provided with a closing plate on each of the head side and the bottom side of the solenoid coils stacked in the axial direction, sandwiching the solenoid coil group, and supporting and fixing via a stud. . On the other hand, the outside of the solenoid coil group (toroidal coil side) is a space region where the lead of each solenoid coil and the jumper between the solenoid coils are arranged by utilizing the relatively low magnetic field.
[0017]
However, since the conventional solenoid coil support device has a stud that supports the closing plate, the arrangement position of the lead-out portion and the jumper wire is limited, and the placement position of the lead-out portion and the like cannot be provided at a predetermined position. There was a point.
[0018]
(3) When a conventional solenoid coil support device is assembled and disassembled, a compression force is applied to the solenoid coil with a hydraulic jack or the like in advance, and then a bolt or the like is loosened from the stud. For this reason, the solenoid coil support device has been subjected to a work of loading and unloading a hydraulic jack and a large support jig for each assembly and disassembly, which has required a lot of labor for the operator.
[0019]
(4) When the current applied to the solenoid coil is changed during the plasma start-up operation, the magnetic flux of the solenoid coil changes. Therefore, an eddy current is generated in the toroidal direction in each part of the support device for the solenoid coil, and the refrigeration capacity of the vacuum vessel is reduced due to Joule heat generation. In addition, there have been problems such as a decrease in strength as a result of long-term use.
[0020]
(5) A conventional solenoid coil support device is a stud in which solenoid coils are stacked on the outside of a cylindrical body, a closing plate is provided on the top side and the bottom side of the stacked solenoid coil, and the stud is provided along the circumferential direction of the closing plate. Although the solenoid coil is fixedly supported by the above-described method, there are problems such as a longer time for cooling time, particularly a time for lowering the temperature in the cryostat because of the large number of studs.
[0021]
The present invention has been made to solve such problems, and can sufficiently follow the thermal contraction generated in the solenoid coil during operation so that a space between the solenoid coil and the toroidal coil can be secured. It can be installed compactly, and it can be easily assembled and disassembled. During plasma startup operation, eddy currents are reduced, and the refrigeration capacity during operation is increased to maintain high mechanical strength. An object of the present invention is to provide a support device for a central solenoid coil.
[0022]
[Means for Solving the Problems]
In order to achieve the above object, a support device for a central solenoid coil according to the present invention includes a vacuum vessel housed in a cryostat and formed in a torus shape, and a circumferential direction of the vacuum vessel. A central solenoid having a toroidal magnetic field coil arranged radially at equal intervals, and a support structure that supports the central solenoid coil that is adjacent to the toroidal magnetic field coil and is stacked along the axial direction of the central axis of the cryostat. In the coil support device, the support structure is composed of a main column shaft and a main column cylinder, and is arranged annularly at the upper portion along the circumferential direction of the main column cylinder, and the outer periphery of the main column cylinder A bracket for applying a pressing force to the central solenoid coil stacked on the central solenoid coil, and the main column cylinder and the center provided between the bracket and the central solenoid coil. It is obtained by a coil support structure relative displacement absorber for absorbing the relative displacement between Renoidokoiru.
[0023]
In order to achieve the above object, a central solenoid coil support device according to the present invention comprises, as described in claim 2, a plurality of coil / support structure relative displacement absorbers, each of which is composed of a plurality of stacked disc springs and disc springs. A disc spring fixing plate inserted in an intermediate portion, a stud for supporting the disc spring, a stud fixing seat plate for supporting the stud, a nut for fixing the stud, and sliding the stud fixing seat plate to the center It consists of a plate plate that presses the head side of the solenoid coil.
[0024]
In order to achieve the above object, a support device for a central solenoid coil according to the present invention transmits a radial movement caused by thermal contraction of the central solenoid coil to a plate spring as described in claim 3. Therefore, a groove for sliding the stud fixing seat plate is provided.
[0025]
In order to achieve the above object, the central solenoid coil supporting device according to the present invention is such that the disc spring is reversely directed on the head side and the bottom side with the disc spring fixing plate as a boundary. It is arranged.
[0026]
In order to achieve the above object, the support device for the central solenoid coil according to the present invention is characterized in that, as described in claim 5, the support structure and the bracket are provided with split extension lines of toroidal magnetic field coils in the circumferential direction. Is divided by a toroidal gap extending in the axial direction of the support structure, and is connected to the toroidal gap via an insulating sheet.
[0027]
In order to achieve the above object, a support device for a central solenoid coil according to the present invention is characterized in that, as described in claim 6, the divided support structure and the bracket are connected by an insulating bolt. Is.
[0028]
In order to achieve the above object, a support device for a central solenoid coil according to the present invention is characterized in that the main column shaft is connected to the main column tube body via a rib as described in claim 7. To do.
[0029]
In order to achieve the above object, a support device for a central solenoid coil according to the present invention includes, as described in claim 8, a bracket disposed along the outer circumferential direction of the main columnar cylinder via a bracket key. It is characterized by being engaged with the main pillar cylinder.
[0030]
In order to achieve the above object, a support device for a central solenoid coil according to the present invention provides a coil / support structure relative displacement absorber as a presser for supporting the head side of a leaf spring. A plate, a stud that supports the leaf spring, a leaf spring fixed seat plate that supports the bottom side of the leaf spring, and a plate plate that slides the leaf spring fixed seat plate and presses the head side of the central solenoid coil It is composed of
[0031]
In order to achieve the above object, a support device for a central solenoid coil according to the present invention provides a plate plate with radial movement due to thermal contraction of the central solenoid coil applied to the plate spring. In order not to transmit, a groove for sliding the leaf spring fixed seat plate is provided.
[0032]
In order to achieve the above object, the central solenoid coil support device according to the present invention is a plate spring having a polygonal shape as described in claim 11.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a central solenoid coil support device according to the present invention will be described below with reference to the drawings and the reference numerals attached to the drawings.
[0034]
FIG. 1 is a schematic overall perspective view showing an embodiment of a fusion device incorporating a support device for a central solenoid coil according to the present invention.
[0035]
In the nuclear fusion apparatus applied to the present embodiment, a torus-like vacuum vessel 15 for confining plasma 14 is accommodated in a cryostat 13 as a cylindrical adiabatic vacuum vessel. The vacuum vessel 15 includes a shield 16 that is incorporated on the inner peripheral side thereof and shields radioactive materials generated by the plasma 14. The vacuum vessel 15 includes a diverter 17 that is provided on the bottom side thereof, removes impurity particles that are not necessary for the fusion reaction, and exhausts helium that has not been used for the fusion reaction.
[0036]
A coil group 18 that generates magnetic lines of force surrounding the plasma 14 is provided around the outer periphery of the vacuum vessel 15. The coil group 18 is provided with a toroidal magnetic field coil 19 that mainly forms magnetic lines for confining plasma, and a poloidal magnetic field coil 20 that forms magnetic lines for controlling the position and shape of the plasma 14 confined by the toroidal magnetic field coil 19. Yes.
[0037]
Further, an upper port 21, a horizontal port 22, and an exhaust duct 23 are provided between the vacuum vessel 15 and the cryostat 13. The upper port 21 functions as an opening for performing maintenance, inspection, and replacement of the structure accommodated in the container, and is normally closed with a plug (not shown). Further, the exhaust duct 23 exhausts helium and the like collected by the diverter 17 out of the vacuum vessel 15. The horizontal port 22 is mainly inserted with a plasma heating device (not shown).
[0038]
On the other hand, the plasma 14 is provided with a central solenoid coil 24 surrounding the central axis CL and in which the solenoid coil A, solenoid coil B, solenoid coil C, solenoid coil D,... Are sequentially stacked in the axial direction. Yes.
[0039]
The center solenoid coil 24 is supported by a support structure 25 as shown in FIGS. The support structure 25 is formed in a cylindrical shape outside the main column shaft 26 and is connected via a rib 27, and a solenoid coil A and a solenoid coil are formed outside the main column tube 28. B,... Of the central solenoid coil 24 and the annular plate plates 29a and 29b that respectively press the bottom side and the head side of the central solenoid coil 24, and annularly with the plate plate 29b on the head side. A coil / support structure relative displacement absorber 31 provided between the bracket 30 and the arranged bracket 30 is provided. As shown in FIG. 3, the support structure 25 and the bracket 30 are divided by the toroidal gap G in the axial direction and on the extension line from the end of the toroidal magnetic field coil (not shown), and the plasma combustion The eddy current generated is kept low when the magnetic field variation is repeated until the end.
[0040]
As shown in FIG. 4, the coil / support structure relative displacement absorbing device 31 is annularly arranged at the upper portion along the circumferential direction of the main columnar cylinder 28 and is engaged with a bracket key 32. And a disc spring 33 provided between the bracket 30 and a plate plate 29b for pressing the head side of the central solenoid coil 24.
[0041]
The disc spring 33 has a disc spring fixing plate 34 inserted in an intermediate portion thereof, and is arranged in the opposite direction on the head side and the bottom side with the disc spring fixing plate 34 as a boundary to form a plurality of disc springs along the axial direction. They are stacked and fixedly supported by studs 35 and nuts 36. The disc spring 33 is provided with a stud fixing seat plate 37 at the bottom thereof, and the plate plate 29b slides in the groove 38 against the thermal contraction of the central solenoid coil 24 generated during operation. It is possible to move in the radial direction.
[0042]
Further, the main column shaft 26, the main column cylinder 28, and the bracket 30 disposed along the circumferential direction thereof extend along the split extension line P at the end of the toroidal magnetic field coil 19, as shown in FIG. It is divided by the toroidal gap G, and by connecting the toroidal gap G with an insulating sheet 39 interposed, the eddy current generated when the magnetic field fluctuates is suppressed low.
[0043]
In addition, as shown in FIG. 6, one bracket 30a and the adjacent bracket 30b are engaged with each other by an insulating key 32a, and an insulating sheet 39 is inserted into a toroidal gap G, and each other is insulated by an insulating bolt 40. It is fixed.
[0044]
Although not shown, in the main column shaft 26 and the main column cylinder 28 which are divided in the circumferential direction, the adjacent main column shaft and main column cylinder are engaged with each other by an insulating key so as to be insulated from the toroidal gap G. The sheet 39 is inserted and fixed with insulating bolts 40.
[0045]
Next, the operation will be described.
[0046]
When assembling the solenoid coil A, solenoid coil B,..., The center solenoid coil 24 applies a compressive force to each solenoid coil A, B,. The space distance with the solenoid coil is expanded, and a disc spring 33 or the like as the coil / support structure relative displacement absorber 31 is installed at the expanded space distance. When the installation of the disc spring 33 or the like is completed, each solenoid coil A, B,... Extends in the axial direction or the main columnar cylinder 28 contracts, and the spatial distance between the bracket 30 and the central solenoid coil 24 is reduced. A relative displacement occurs between the bracket 30 and the central solenoid coil 24 due to a difference in thermal expansion. At this time, the coil / support structure relative displacement absorbing device 31 uses the relative force generated between the bracket 30 and the central solenoid coil 24 as a boundary between the elastic force of the disc spring 33 and the disc spring fixing plate 34 as a boundary. Is absorbed by the mutual harmony of the disc springs 33 arranged in the opposite direction.
[0047]
Further, during the refrigeration operation, the central solenoid coil 24 and the main columnar cylinder 28 of the support structure 25 contract together, but at this time, the relative difference between the bracket 30 and the central solenoid coil 24 due to the difference in thermal expansion. Displacement occurs. However, the relative displacement at this time is also the elastic force of the disc spring 33 with respect to the displacement in the axial direction of the solenoid coil, and the central solenoid coil 24 with respect to the stud fixing seat plate 37 with respect to the displacement in the coil radial direction. The plate plate 29 that holds down is absorbed by moving in the radial direction.
[0048]
As described above, in this embodiment, the coil / support structure relative displacement absorbing device 31 is provided between the bracket 30 and the center solenoid coil 24, and the relative displacement between the center solenoid coil 24 and the support structure 25 is determined by the coil- While being absorbed by the support structure relative displacement absorber 31, a pressing force (compression force) is applied to the central solenoid coil 24 through the bracket 30 of the support structure 25 and the support structure relative displacement absorber 31, and the solenoid is operated during operation. The unbalanced electromagnetic force generated in the coil 24 can be effectively transmitted to the support structure, and eddy currents generated from the support structure 25 and the bracket 30 can be suppressed, and the central solenoid coil 24 is maintained in a stable state. You can drive.
[0049]
Further, in the present embodiment, the relative displacement absorption of the coil / support structure including the disc spring 33, the disc spring fixing plate 34, the stud 35, the nut 36, and the stud fixing seat plate 37 between the bracket 30 and the central solenoid coil 24 is performed. Since the device 31 is provided, the central solenoid coil 24 can be easily disassembled and assembled without requiring a special tool, and the labor of the operator in a narrow place can be further reduced.
[0050]
FIG. 7 is a schematic partial view showing a second embodiment of the support structure of the central solenoid coil according to the present invention. In addition, the same code | symbol is attached | subjected to the same part as the component of 1st Embodiment.
[0051]
In the present embodiment, the coil / support structure provided between the central solenoid coil 24 arranged outside the main column cylinder 28 of the support structure 25 and the bracket 30 whose head side is fixedly supported by the bracket key 32. The relative displacement absorbing device 31 is a plate spring 41 instead of the disc spring of the first embodiment. In addition, since the support structure 25 is the same as the structure of 1st Embodiment, the description is abbreviate | omitted.
[0052]
The leaf springs 41 are stacked along the axial direction of the main columnar cylinder 28 and fixedly supported by the studs 42, and a pressing plate 43 is provided on the head side, and a leaf spring fixing seat plate 44 is provided on the bottom side. The blade plate 29b slides in the radial direction with respect to the leaf spring fixed seat plate 44 in the radial direction, similarly to the first embodiment, against the thermal contraction of the central solenoid coil 24 generated during operation. To be able to move.
[0053]
Further, for example, as shown in FIG. 8, the leaf spring 41 is formed in a polygonal shape such as a hexagon, and is fixedly supported by a stud 42 via a presser plate 43. Moreover, the bracket 30 arrange | positioned along the circumferential direction of the main pillar axis | shaft, the main pillar cylinder, and the main pillar cylinder 28 is the same structure as 1st Embodiment, as shown in FIG. An insulating sheet 39 is inserted in a toroidal gap G extending along the split extension line P at the end of the toroidal magnetic field coil 19 between the bracket 30a and the adjacent bracket 30b, so that the eddy current generated when the magnetic field fluctuates is kept low. It is like that.
[0054]
Further, as shown in FIG. 9, one bracket 30a and the adjacent bracket 30b have the same configuration as in the first embodiment, and are mutually connected by an insulating key 32a provided on the head side of the main columnar cylinder 28. Are engaged with each other, and an insulating sheet 39 is inserted into the toroidal gap G and fixed to each other by an insulating bolt 40.
[0055]
The divided main column shaft and main column cylinder have the same configuration as that of the first embodiment.
[0056]
As described above, in this embodiment, the coil / support structure relative displacement absorbing device includes the leaf spring 41, the stud 42, the presser plate 43, and the leaf spring fixing seat plate 44 between the bracket 30 and the central solenoid coil 24. 31, and the relative displacement between the central solenoid coil 24 and the support structure 25 is absorbed by the coil / support structure relative displacement absorber 31, while the support structure relative displacement absorber 31 from the bracket 30 of the support structure 25. Since a pressing force is applied to the central solenoid coil 24 via the center, and the unbalanced electromagnetic force generated in the central solenoid coil 24 is effectively transmitted to the support structure during operation, as in the first embodiment, The eddy current generated from the solenoid coil 24 can be suppressed, and the central solenoid coil 24 can be operated in a stable state. That. In this embodiment, since the leaf spring 41 is applied as the coil / support structure relative displacement absorbing device 31, the allowable range of the spring constant can be widened compared to the disc spring 33 of the first embodiment. This is effective when the relative displacement between the central solenoid coil 24 and the support structure 25 is high.
[0057]
【The invention's effect】
As described above, the support device for the central solenoid coil according to the present invention includes the main column shaft and the main column cylindrical body, and a bracket for applying a pressing force to the central solenoid coil disposed outside the main column cylindrical body. The coil / support structure relative displacement absorbing device that absorbs the relative displacement between the central solenoid coil and the main column tube body is provided, so that the relative displacement between the central solenoid coil and the support structure is determined by the coil / support structure. While being absorbed by the relative displacement absorbing device, a pressing force is applied to the central solenoid coil via the bracket of the supporting structure and the supporting structure relative displacement absorbing device, and unbalanced electromagnetic force generated in the solenoid coil during operation is supported by the supporting structure. The center solenoid coil in a stable state, and the eddy current generated from the support structure and bracket can be suppressed. It can be operated by lifting.
[Brief description of the drawings]
FIG. 1 is a schematic overall perspective view showing a nuclear fusion apparatus incorporating a support device for a central solenoid coil according to the present invention.
FIG. 2 is a schematic half longitudinal sectional general view showing a first embodiment of a central solenoid coil support device according to the present invention;
3 is a cross-sectional plan view seen from the direction of arrows AA in FIG. 2. FIG.
4 is a schematic partial enlarged view of a Y portion in FIG. 2;
5 is a cross-sectional view taken along the line BB in FIG.
6 is a cross-sectional view cut in the direction of arrows CC in FIG. 4;
FIG. 7 is a schematic partial view showing a second embodiment of the support device for the central solenoid coil according to the present invention.
8 is a cross-sectional view taken along line DD in FIG.
9 is a cross-sectional view taken along the line EE in FIG.
FIG. 10 is a schematic half longitudinal sectional view showing a conventional fusion device.
FIG. 11 is a schematic overall view showing a conventional support device for a central solenoid coil.
12 is a schematic perspective view of the central solenoid coil support device shown in FIG.
13 is a schematic partial enlarged view of a portion X in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plasma 2 1st wall 3 Bracket 4 Diverter 5 Vacuum vessel 6 Toroidal magnetic field coil 7 Polo-dail magnetic field coil 8 Cryostat 9 Superconducting solenoid coil 10 Cylindrical body 11a, 11b Closure plate 12 Stud 13 Cryostat 14 Plasma 15 Vacuum vessel 16 Shield 17 Diverter 18 Coil group 19 Toroidal magnetic field coil 20 Poroidal magnetic field coil 21 Upper port 22 Horizontal port 23 Exhaust duct 24 Central solenoid coil 25 Support structure 26 Main column shaft 27 Rib 28 Main column cylinders 29a, 29b Plate plates 30, 30a, 30b Bracket 31 Coil / support structure relative displacement absorber 32 Bracket key 32a Insulation key 33 Belleville spring 34 Belleville spring fixing plate 35 Stud 36 Nut 37 Stud fixing seat plate 38 Groove 39 Insulating sheet 40 Insulation Belt 41 the leaf spring 42 stud 43 pressing plate 44 a leaf spring fixed seat plate

Claims (11)

A vacuum vessel housed in a cryostat and formed in a torus shape;
A toroidal magnetic field coil arranged radially at equal intervals in the circumferential direction of the vacuum vessel, and a support structure for supporting a central solenoid coil that is adjacent to the toroidal magnetic field coil and stacked along the axial direction of the central axis of the cryostat In the central solenoid coil support device provided with a body, the support structure is composed of a main column shaft and a main column tube, and is arranged annularly at the upper portion along the circumferential direction of the main column tube. A bracket is provided between the bracket and the central solenoid coil for applying a pressing force to the central solenoid coil stacked on the outer periphery of the main cylindrical body, and the relative displacement between the main cylindrical body and the central solenoid coil is determined. A support device for a central solenoid coil, comprising: a absorbing coil and a supporting structure relative displacement absorbing device.   A disc spring fixing plate in which a plurality of coil / support structure relative displacement absorbing devices are stacked and interposed between intermediate portions of the disc spring and the disc spring, a stud that supports the disc spring, and a stud fixing seat plate that supports the stud The center solenoid coil according to claim 1, wherein the center solenoid coil includes a nut that fixes the stud, and a plate plate that slides the stud fixing seat plate and presses the head side of the center solenoid coil. Support device.   3. The central solenoid coil support device according to claim 2, wherein a groove is provided in the plate plate so that the plate plate slides in a radial direction in accordance with thermal contraction of the central solenoid coil.   3. The central solenoid coil supporting device according to claim 2, wherein the disc springs are arranged in opposite directions on the head side and the bottom side with the disc spring fixing plate as a boundary.   The support structure and the bracket are divided in the circumferential direction by a toroidal gap extending in the axial direction of the support structure along the split extension line of the toroidal magnetic field coil, and connected to the toroidal gap through an insulating sheet. 2. The support device for a central solenoid coil according to claim 1, wherein the support device is a central solenoid coil.   6. The central solenoid coil support device according to claim 5, wherein the divided support structure and the bracket are connected by an insulating bolt.   2. The central solenoid coil support device according to claim 1, wherein the main column shaft is connected to the main column cylinder through a rib.   2. The support device for a central solenoid coil according to claim 1, wherein a bracket disposed along the outer circumferential direction of the main columnar cylinder is engaged with the main columnar cylinder via a bracket key.   The coil / support structure relative displacement absorbing device includes a presser plate that supports the top side of the leaf spring, a stud that supports the leaf spring, a leaf spring fixed seat that supports the bottom side of the leaf spring, and the leaf spring. 2. The central solenoid coil supporting device according to claim 1, wherein the fixed seat plate is slid and the plate plate presses the head side of the central solenoid coil.   10. The central solenoid coil support device according to claim 9, wherein a groove is provided in the plate plate so that the plate plate slides in a radial direction in accordance with thermal contraction of the central solenoid coil.   10. The central solenoid coil support device according to claim 9, wherein the leaf spring is formed in a polygonal shape.

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