JPH02237101A - Superconducting magnetic-field utilization apparatus - Google Patents

Abstract

PURPOSE:To easily take out a vacuum container and to use a support member whose heat invasion from the outside to superconducting coils is small by a method wherein a yoke is divided, a structure to easily take out the vacuum container to the outside is formed, the support member is installed between the superconducting coils and a attracting force is supported. CONSTITUTION:Internal support members 9, 10 are installed between one pair of superconducting coils 1, 2; the internal support members are formed as the members 9, 10 which can be divided to the upper part and the lower part; in addition, airtight members 18 to 21 which can form an airtight container are provided for the individual superconducting coils 1, 2. Accordingly, the internal support members 9, 10 are inserted between the superconducting coils 1, 2; an attracting force between the superconducting coils 1, 2 is supported physically; it is sufficient to use positioning members (external support members) 16, 17, between the superconducting coils 1, 2 and yokes, whose heat conduction is small and whose cross-sectional area is small; upper and lower yokes 7, 8 can be separated; also the upper and lower superconducting coils 1, 2 can be separated together with the yokes to be separated. Thereby, it is possible to form the superconducting coils by which heat creeping in from the outside is small, and a vacuum container for magnetic utilization use can be taken out easily.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a superconducting magnetic field utilization device, and in particular to a superconducting coil maintained at an extremely low temperature and a container that defines a magnetic field utilization space between magnetic poles. This article relates to a superconducting magnetic field utilization device that can be taken out to the outside. Below, we will mainly explain an electron storage ring that generates synchrotron radiation as an example. [Prior Art] An electron storage ring (SOR) confines accelerated electrons in a strong magnetic field and generates synchrotron radiation by rotating them. A superconducting magnet is used to create a strong magnetic field to confine these accelerated electrons. Superconducting magnets are
Contains superconducting coils cooled to extremely low temperatures. Figure 2 schematically shows the typical structure of a conventional electron storage ring. The upper superconducting coil 51 and the lower superconducting coil 52 are arranged coaxially and facing each other in a Helmholtz coil type. An annular upper magnetic pole 53 is arranged in an area surrounded by the upper superconducting coil 51, and an annular lower magnetic pole 54 is symmetrically arranged in an area surrounded by the lower superconducting coil 52. An annular vacuum container 55 is disposed between the magnetic poles 53 and 54 to store electrons orbiting in a magnetic field. A yoke 57 surrounds the upper superconducting coil 51 and the lower superconducting coil 52 from the outside, and further extends to sandwich the upper magnetic pole 53 and the lower magnetic pole 54 from above and below, forming a magnetic circuit. When a current is passed through the upper superconducting coil 51 and the lower superconducting coil 52, a strong attractive force is created between the two superconducting coils.Therefore, a physical support structure is required to oppose the two superconducting coils. On the other hand, it is necessary to take the vacuum container 55 out to perform maintenance, change settings, etc., as necessary. First, in order to support the force acting between the upper and lower superconducting coils 51 and 52, it is preferable to arrange a physical support member between both the superconducting coils 51 and 52. Therefore, as shown in FIGS. 3A and 3B, it is desirable to directly connect the upper and lower superconducting coils 51 and 52 at at least several locations using internal support rods 58a and 58b. However, with this structure, the vacuum container 55 cannot be taken out. In order to be able to take out the vacuum container 55, it is desirable to divide the yoke 57 at a horizontal neutral plane 56, as shown in FIG. The vacuum container 55 can be taken out by lifting the upper superconducting coil 51 and yoke 57a. However, in this method, a large amount of heat enters from the external support rod 59 of the superconducting coils 51 and 52, and the amount of helium consumed becomes large. This situation exists not only in electron storage devices, but also in devices that utilize superconducting magnetic fields. [Problems to be Solved by the Invention] As explained above, according to the prior art, when the pair of superconducting coils 51 and 52 are physically supported, the magnetic poles 53,
The vacuum container 55 between the vacuum containers 54 and 54 cannot be easily removed.
If the yoke 57 is divided into two to make it easier to take out the superconducting coils 51 and 52, and the superconducting coils 51 and 52 are supported on each yoke 57a and 57b by the external support member 59, heat infiltration from the external support member 59 increases and the consumption of liquid helium is reduced. While increasing
was there.

An object of the present invention is to provide a superconducting magnetic field utilization device in which a vacuum container can be easily taken out and a support member for supporting a superconducting coil from the outside can be made to have a small amount of heat intrusion. [Means for Solving the Problems] An internal support member is provided between a pair of superconducting coils, this internal support member is configured to be divisible, and an airtight member is provided to form an airtight container for each superconducting coil. Furthermore, the internal support member may also be configured to be separable from the superconducting coil. The basic concept of the present invention will be explained with reference to FIGS. 1(A) and 1(B). (A) is an overall cross-sectional view, and (B) is a partial cross-sectional view when the superconducting coils are separated. A pair of superconducting coils 1,
2 surrounds a pair of magnetic poles 3 and 4, and generates a magnetic field between the magnetic poles 3 and 4. A vacuum container 5 is placed in this magnetic field, and the magnetic field is used to accumulate electrons inside the container. Superconducting coils 1 and 2 are cooled to extremely low temperatures using liquid helium. However, the liquid helium and liquid nitrogen systems for cryogenic cooling are not shown. Upper yoke 7, lower yoke 8
are continuous with the upper magnetic pole 3 and the lower magnetic pole 4, respectively, and the horizontal neutral plane 6
contact each other to form a magnetic circuit. Between the upper superconducting coil 1 and the lower superconducting coil 2, there are upper and lower internal support members 9,
10 is provided, current is passed through both superconducting coils 1 and 2,
When an attractive force is applied, both superconducting coils 1 and 2 are supported in opposition to the attractive force. When these internal support members 9 and 106 are used, they become extremely cold. Cryostat gates 14 and 15 are provided surrounding these extremely low temperature parts. This cryostat case has both superconducting coils 1 and 2.
It can be separated into an upper cryostat case part 14 and a lower cryostat case part 15 correspondingly. Superconducting coil 1
, 2 is also connected to the yoke 7 by the positioning members 16, 17.
It is supported by 8 and determines its position. When the cryostat case is separated, the internal support members 9 and 10 are also separated, and the second seal members 20 and 21 that protrude from the upper and lower internal support members 9 and 10 are removed from the first seal members that protrude from the upper and lower cryostat case parts 14 and 15. By engaging with the sealing members 18 and 19, the upper and lower parts can form airtight vacuum containers separately. As shown on the upper side in FIG. 1(B), by further pulling up the superconducting coil 1, the superconducting coil 1 and the internal support member 9 are also separated, and the internal support member 9 is separated from the cryogenic temperature. The same applies to the lower side. [Function] First, when the device is assembled and used, the internal support members 9 and 10 are inserted between the superconducting coils 1 and 2, and the superconducting coils 1 and 2
It provides physical support to the attractive force between the two. The positioning members (external support members) 16 and 17 between the slanted superconducting coils 1 and 2 and the yoke need only have small cross-sectional areas with low thermal conductivity. Therefore, it is possible to reduce the inflow of heat from the outside into the cryogenic part. The upper and lower yokes 7 and 8 can be separated, and the upper and lower superconducting coils 1 and 2 can also be separated together with the yokes, making it easy to take out the vacuum vessel 5. Furthermore, when the internal support members 9 and 10 have a configuration that allows them to be disengaged from the superconducting coils 1 and 2, it is possible to further reduce the inflow of heat into the cryogenic region at the time of . [Embodiment] An embodiment of the present invention will be described with reference to FIGS. 5, 6, and 7. FIG. 5 is a partial cross-sectional view of the superconducting magnetic field utilization device shown in FIG. A vacuum container 5 is placed between the upper magnetic pole 3 and the lower magnetic pole 4. An upper yoke 7 and a lower yoke 8, which are connected by a horizontal neutral plane 6 between the upper magnetic poles 3 and 4, are connected in a magnetic circuit. Upper and lower superconducting coil units 29 and 30 are disposed passing through the upper and lower yokes 7 and 8 and the vacuum vessel 5. The upper superconducting coil 1 is sealed within a coil gate 23 and cooled with liquid helium. Upper and lower coil unit 2
9 and 30 have a nearly symmetrical configuration. Here, the upper coil unit 29 will be explained. coil case 2
An external support rod 16a, which is a positioning member, is housed above 3 and fixed to the upper yoke 7 at its upper end. An internal support rod 9 that is an internal support member is provided below the coil case 23.
a is attached and is in contact with the internal support rod lOa (not shown) of the lower coil unit 30 at the horizontal neutral plane 6 of the device. The attraction force acting on the upper and lower coils 1 and 2 when energized is handled by the internal support rods 9a and 10a, and the external support rod i
6a is for fixing the upper coil unit 29 to the upper yoke 7, and its supporting force is small. A contact finger 31 is provided at the engagement portion between the internal support rod 9a and the coil case 23. Perform partial thermal or mechanical engagement via contact fingers before achieving full engagement. A heat shield plate 25 is attached around the coil gauge 23, and serves to reduce heat intrusion from the upper cryostat case 14 on the outside. Although illustrated in one layer,
It is preferable to form an ellipse with multiple layers at different temperatures. An adjustment mechanism is attached to the upper end of the external support rod 16a to adjust the coil case 23 to the upper cryostat gauge 14.
On the other hand, a valve plate 20a, which is a sealing member, is attached to the internal support rod 9a, which can be moved up and down relatively, as shown in the partially enlarged view of FIG. 6, and is attracted to the coil case 23 by a spring 33. A valve seat 18a, which is a sealing member, is attached to the upper cryostat case 14 at a corresponding position. valve great 20
When a and the valve seat 18a are engaged, a valve that maintains an airtight state is formed. Similarly, a valve plate 40 and a valve seat 38 are provided on the lower side to constitute a valve. A flange 37 is formed on the lower surface abutting part of the upper cryostat case 14, and has a top structure that maintains a vacuum using an O-ring between it and the flange of the lower cryostat case. The cryostat gate 14 surrounding the 9a is connected to a connecting hole 39 provided in the vacuum container 5.
It's in. The hole 39 provided in the vacuum container is, for example, the seventh hole.
They are installed at six evenly distributed locations as shown in the plan view of the figure. Electrons enter from the direction shown by the arrow and orbit in the orbit shown by the dashed line. Various equipment will be installed in the area shown by hatching on this orbit route. The aforementioned hole 39 is determined avoiding this hatched area. This hole may be a hole cut into the outer edge. Furthermore, if it is possible to reduce the outer diameter of the vacuum container, there is no need for notches or holes. As shown in FIG. 6, a heater and a temperature sensor 27 are installed near the lower end surface of the support rod 9a.
is installed. This is to heat the internal support rod 9a, which was at an extremely low temperature, to prevent condensation when it is exposed to the outside air. In the configuration shown in FIGS. 5 to 7, the magnetic circuit has a vertically symmetrical structure, and can be separated into upper and lower parts at the center. The superconducting coil can be maintained at an extremely low temperature even during separation, which saves helium consumption and shortens the time it takes to start operation after installing the vacuum vessel. The procedure for removing and assembling the vacuum container 5 will be briefly explained below. The procedure for taking out the vacuum container 5 to the outside is as follows. 1. Pull the external support rod 16 upward using the adjustment mechanism at the top. By this operation, the valve grating 20a (Fig. 6) attached to the internal support rod 9a is pressed against the valve seat 18a. This forms an airtight vacuum vessel in the upper cryostat gauge 14ffl. 2. When the external support rod 16a is further pulled up, the coil gauge 23 and the internal support rod 9a are separated and pulled together by the spring 33. That is, the internal support rod 9a
will be lectured on from extremely low temperatures. 3. Heat the lower part of the internal support rod 9a with the heater 27 and return it to room temperature. This will prevent condensation even when exposed to outside air. 4. Repeat the above procedure for the lower coil unit as well. Both valve grades 20a and 40 are valve seats 18
a, 38 to create a buffer space 43 in the middle. 5. Open the leak valve 35 and bring the buffer space 43 to atmospheric pressure. 6. Lift the upper yoke 7 and take out the vacuum container 5. The method for importing a vacuum container is as follows. l. Assemble the vacuum container 5.

2. Lower the upper yoke 7 and lower the upper cryostat gauge 14.
Butt the 7-lunge part 37 of the lower cryostat gauge with the 7-lunge part of the lower cryostat gauge. 3. The buffer space 43 is evacuated. 4. The external support port γ rod 16a is lowered, and the contact finger 31 attached to the internal support rod 9a is brought into contact with the coil gauge 32. Further lowering the external support rod 16a causes the valve plate 20a to separate from the valve seat 18a. At this time, the internal support rod 9a and the coil gauge 23 are in partial mechanical and thermal contact via the contact fingers 31. 5. When the heater 27 is turned off, the internal support rod 9a is cooled via the contact finger 31 and the spring 33. 6. Detect the temperature with a temperature sensor. When the temperature of the internal support rod 9a approaches the temperature of the coil case 23, the external support rod 16a is pushed down to the final position. As explained above, according to this embodiment, the load on the external support rod 16a connected to the low temperature section is small, so the cross section can be made small, and a superconducting coil with little heat intrusion from the outside can be created. The internal support rod can be divided into upper and lower parts, and the superconducting coils can be housed in separate upper and lower airtight vacuum containers, so the vacuum containers for magnetic field utilization can be easily taken out.

Furthermore, when the upper and lower joints of the coil unit are exposed to the atmosphere, by separating the internal support rod 9a from the cryogenic part, it is possible to reduce heat intrusion from the internal support rod 9a. By providing a heater on the end face of the internal support rod 9a and heating it, dew condensation and freezing on the end face can be prevented. Although the embodiments have been described above, the present invention is not limited thereto. For example, it will be obvious to those skilled in the art that various modifications, changes, combinations, etc. are possible. [Effects of the Invention] As explained above, according to the present invention, the vacuum container can be easily taken out by dividing the yoke, and the suction force can be supported by providing a support member between the superconducting coils. When taking out the vacuum container, the upper and lower superconducting coils can be stored independently and separately in a separate vacuum-tight container while keeping the upper and lower superconducting coils at an extremely low temperature.

[Brief explanation of drawings]

1 (A) and (B) show the basic concept of the present invention, and (A
) is a schematic cross-sectional view of the superconducting magnetic field utilization device in use, (B)
are schematic partial cross-sectional views when cutting M, Fig. 2, Fig. 3 (A), (
B), FIG. 4 is a schematic cross-sectional view of a superconducting magnetic field utilizing device for explaining the prior art, FIG. 5 is a cross-sectional view showing a superconducting magnetic field utilizing device according to an embodiment of the present invention, and FIG. FIG. 7 is a plan view showing an example of the planar structure of the vacuum container 5 shown in FIG. In the figure: 1, 2 3, 4 7, 8 9, 10 9a 14, 15 16, 17 Superconducting coil magnetic pole Vacuum vessel neutral plane Yoke support member Internal support rod Cryostat gauge positioning member 16a 1 8, 19 20, 21 29 , 30 18a, 38 20a, 40 External support rod First sealing member Second sealing member Coil case Heat shield plate Heater and temperature sensor Coil unit Contact finger Spring Leak valve Flange Valve Seat Valve plate Hole Buffer space Upper superconducting coil Lower superconducting Coil upper magnetic pole lower magnetic pole vacuum vessel yoke support rod sub-agent

Claims (2)

[Claims] (1). A container (5) that defines a space in which a magnetic field is used, a pair of magnetic poles (3, 4) for forming a magnetic field in at least a predetermined region within the container (5), and a yoke that magnetically connects these magnetic poles. and a pair of superconducting coils (1, 2) for generating magnetic flux surrounding these magnetic poles (3, 4), the yoke being connected to each magnetic pole (3, 4). Two parts (
7 and 8), one end of which engages with the pair of superconducting coils (1, 2), and the other end of which engages with each other to support the attraction force acting between the superconducting coils; load supporting members (9, 10); 1 surrounding each of the pair of load supporting members (9, 10) and one of the superconducting coils (1, 2) adjacent thereto;
A pair of cryostat cases (14, 15) that engage each other to form one vacuum vessel, and each separately have a first seal member (18) for forming an airtight seal.
, 19) with a pair of cryostat cases (14
, 15) formed outward from near the mutually engaging ends of each of the pair of load supporting members (9, 10) and engaging with the first sealing member to form an airtight seal. and a valve member (35) formed between the first seal member (18, 19) for connecting with the exhaust system and leaking outside air.
A superconducting magnetic field utilization device having (2). The superelectric magnetic field utilizing device according to claim 1, wherein the load supporting member (9, 10) has a configuration that allows the engagement with the superconducting coil (1, 2) to be released.