JPS6119104A - Superconducting magnetic field generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a superconducting magnetic field generator, and particularly to a superconducting magnetic field generator suitable for an ultraviolet light generator (1); MacQuigler (3).

[Background of the invention]

A 5OR (synchrotron orbital emission) device has been put into practical use, which emits light when electrons at speeds close to the speed of light are introduced into an endless (doughnut-shaped) duct evacuated to a high vacuum and the electron orbit is bent with a certain curvature. has been done.

The wavelength λC of synchrotron radiation is expressed as follows. Here, k is a constant, Bo is the magnetic flux density perpendicular to the electron orbit, and E is the electron energy expressed in GeV.

Further, the radius of curvature ρ is expressed as follows. However, β and γ are constants determined by the electron speed V and the speed of light C. 2m is the mass of the electron, and e is the charge of the electron. From equation (1), it can be seen that the larger the magnetic flux density BO and the energy E of the electron, the longer the wavelength. shows that short light can be obtained.
From equation (2), it can be seen that the larger the magnetic flux density Bo, the smaller the radius of curvature of the electron orbit.

In conventional SOR devices, electron orbits are bent using so-called bending electromagnets made of copper or iron. In this type of copper or iron electromagnet, the magnetic flux density Bo is about 10 to 20 kilogauss, and in order to obtain short wavelength light, an accelerator that consumes a huge amount of power is used to increase the energy of the electrons. .

Using superconducting magnets is an effective means to reduce energy loss and increase magnetic flux density Bo. An example of the conventional structure of a superconducting magnet for giving curvature to electron orbits is shown below.
It is shown in FIG. 3 in a partially broken state.

The superconducting coil 1 is fixed to the inner part 4A of the container 4 with a holding plate 2 and bolts 3. The electromagnetic force acting on the superconducting coil 1 is a force in the direction shown by arrows 5A and 5B that tries to spread the coils apart, and an attractive force between the opposing coils shown by arrows 6A and 6B. The deformation of the superconducting coil due to the electromagnetic force acting on it causes the temperature of the superconducting coil to rise due to the release of frictional heat and strain energy during the deformation process, which is the main cause of the transition from the superconducting state to the normal conducting state.

Therefore, the superconducting coil is provided with a support member in a direction opposite to the electromagnetic force so as not to be deformed by the electromagnetic force. In the conventional superconducting magnet shown in FIG.
The electromagnetic force in the direction was transmitted to and supported by the inner portion 4A of the container 4 through the following path.

Superconducting coil 1 → backing plate 7 → push bolt 10 → support plate 8
→Fixing bolt 9→Part inside the container 4A In this structure, a bending moment is applied to the fixing bolt 9, and a large number of bolts are required to counteract the electromagnetic force generated in the superconducting coil 1. Even so, it was impossible to completely suppress the deformation, and the transition to normal conductivity often occurred.

The arrow 11 in FIG. 3 indicates the direction of the electron beam, and FIG. 4 is a schematic two-dimensional representation of this. In FIG. 4, the electron beam 11 incident from the left is directed to the first magnetic pole 2.
1 (perpendicular to the plane of the paper and downward as a - column). Next, it is deflected in the opposite direction by the second magnetic pole 22 (directed upward perpendicularly to the plane of the paper as the - column). Further, it is deflected by the third magnetic pole 23 (same pole as the first magnetic pole) so as to return to the original extension in the orbital direction.

If the distance t1 between the respective magnetic poles is long, the amount of deflection tz of electrons becomes large, and the width t3 of the inner portion 4A of the container 4 must be widened.

In conventional superconducting magnets, the backing plate 7. Support plate 8. A space is required to install the push bolt 10, and the magnetic pole spacing t1 is required.
Because the length of the container was longer, the entire container had to be larger.

[Purpose of the invention]

The purpose of the present invention is to overcome some of the drawbacks of conventional superconducting magnets. Specifically, it is an object of the present invention to provide a superconducting magnetic field generator equipped with a superconducting magnet whose container is small and lightweight to suppress deformation of a superconducting coil. It is.

[Summary of the invention]

In place of the conventional superconducting coil support structure that includes a patch plate, a support plate, and a push bolt, the present invention uses a support member that surrounds the superconducting coil and upper and lower plates or handshafts that are attached to this by welding or the like. This is what was adopted.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described in more detail with reference to FIGS. 1 and 2.

A spacer 32 is provided in close contact with the superconducting coil 31. The spacers 32 are arranged at intervals along the circumferential direction of the coil to form coolant passages. The electromagnetic force support member 33, which is a feature of the present invention, has a shape along the circumferential direction of the coil, and is attached so as to press down the superconducting coil 31 via the spacer 32. Furthermore, the upper plate 34. The superconducting coil 31 and the electromagnetic force supporting member 33 are sandwiched between the superconducting coil 31 and the lower plate 35.

The supporting member 33 is attached using the superconducting coil 31.
There is a method of applying a temperature difference to the support member 33 and attaching it with a gap created due to the difference in thermal expansion (so-called shrink fit), or a method of dividing the support member 33 into multiple pieces and welding them while applying pressure from the outer periphery. A method of connecting and attaching is used.

Further, the upper plate 34 and the lower plate 35 are fixed by welding or the like at contact portions 36 and 37 with the support member 33.

The thus formed superconducting coil unit) 30 is shown by the arrow 3
Since the supporting member 33 directly supports the electromagnetic force in the 8.39 direction, and the upper and lower plates 34 and 35 act as reinforcing members, the unit becomes strong without deformation.

FIG. 2 shows the state in which the coil 22) 30 is attached to the container 4. For installation to the container 4, use the bolt hole 40 shown in the first diagram.
It is extremely simple, as it only needs to be fixed to the inner part 4A of the container using the bolt 41 passed through 17C.

According to this embodiment, the following effects can be obtained.

(1) Since the electromagnetic force support member is in close contact with the superconducting coil, the magnetic pole spacing shown in FIG. 4 is 1. becomes shorter. Therefore, the entire container can be made smaller.

(2) Magnetic pole spacing 1. By shortening, the amount of deflection t2 shown in FIG. 4 also decreases, so the inner dimension t3 of the container can be reduced.

(3) By reducing the inner dimension t3 of the container, the electromagnetic force in the direction shown by arrows 6A, 6]3 in FIG. 3 is reduced, and the thickness of the inner portion 4A of the container 4 can be reduced.

(4) Since the overall size is small and lightweight, the amount of cryogenic refrigerant (liquid helium) used for cooling can be reduced.

In addition, in the above embodiment and the schematic diagram in FIG. 4, the electron beam is bent and only light of one kind of wavelength is emitted. However, for example, two sets of coil units form one magnetic pole. However, this applies to the case where six sets of coil units are used so that adjacent magnetic flux directions are opposite to each other. If you want to obtain two or more types of emitted light with different wavelengths, you can connect them in series. When such a large number of coil units are used, the effect of the present invention in reducing the size and weight is particularly remarkable.

〔Effect of the invention〕

According to the present invention, since the superconducting coil is surrounded by a supporting member and further reinforced by upper and lower plates, there is no need to increase the distance between the magnetic poles, and the container that suppresses deformation of the superconducting coil can be used as a small and lightweight superconducting magnet. A superconducting magnetic field generator equipped with the above is obtained.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing a superconducting magnet according to the present invention, FIG. 2 is a partial sectional view showing a superconducting magnetic field generator using the superconducting magnet, and FIG. 3 is a partial sectional view showing a conventional superconducting magnetic field generating device. Figure 4 is a schematic diagram showing the direction of the electron beam and the arrangement of magnetic poles in plan view. 1... superconducting coil, 2... holding plate, 3... bolt, 4... container, 4A... container. Inner part, 5A, 5B. 6A, 6B... Direction of electromagnetic force acting on the superconducting coil, 7
... Backing plate, 8... Support plate, 9... Bolt, 10
... Push bolt, 11 ... Direction of electron beam, 21
, 22° 23... Magnetic pole, 30... Coil unit,
31... Super conducting coil, 32... Spacer, 33...
...Supporting member, 34...Upper plate, 35...Lower plate, 36
．． 37...Joint part between support member and upper and lower plates, 38.39
...Direction of electromagnetic force acting on the superconducting coil, 40...Bolt hole, 41...Volt.

Claims (1)

[Claims] 1. In a superconducting magnetic field generator used in a synchrotron orbital radiator, etc. that emits light by bending electron orbits using electromagnetic force, a coil unit is constructed by surrounding a superconducting coil with an electromagnetic force supporting member. 1. A superconducting magnetic field generator characterized by comprising a superconducting magnet in which a plurality of coil units are formed and housed in a single cryogenic container. 2. A superconducting magnetic field generating device according to claim 1, characterized in that a coil unit is used in which a space for passing a coolant is formed between the superconducting coil and the electromagnetic force supporting member. 3. A superconducting magnetic field generating device according to claim 1 or 2, characterized in that the electromagnetic force supporting member is fixed and reinforced to the upper and lower plates by welding or the like. 4. In any one of the above claims, there are six or more coil units, one set of two coil units forms one magnetic pole, and the magnetic flux directions of adjacent magnetic poles are opposite to each other. A superconducting magnetic field generator characterized by: