JPS62150804A - Charged particle deflector for synchrotron orbit radiation system - Google Patents

Abstract

PURPOSE:To economically construct and operate a charged particle deflector by connecting all the cryostats which individually contain superconducting coils through heat insulating tubes with specific second cryostats to connecting several electromagnets in series by means of superconducting leads. CONSTITUTION:Superconducting coil 2 are individually contained in cryostats 1 of the same quantity as the coils, connected with second cryostats 6 provided separately through heat insulating tubes 7, and the coils 2 are wired in series by superconducting leads 8 passed through the tubes 7 via the second cryostats. Paired superconducting leads 9 which are fed to the second cryostats 6 through the interiors of the tubes 7 are connected with one side leads of the coils of the both ends. The leads 9 are connected with paired current leads 4 provided from the exterior in the second cryostats in the second cryostats, and one permanent switch 3 is connected between the paired leads 9 to connect the leads 4 with one power source 5.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is directed to a charged particle deflection device used in a synchrotron orbital radiation system, and more specifically, to an economical system when a superconducting electromagnet is used as a deflection electromagnet. The present invention relates to a deflection device that enables economical operation.

[Conventional technology and its problems]

Nowadays, high-density integrated circuits are rapidly progressing, and ultra-super LS
It is desired to develop a synchrotron orbital radiation storage ring (hereinafter referred to as SORIJ song) for the purpose of phosphorography of I.

This S ORIJ song requires several electromagnets for beam deflection, and for high field deflection, superconducting dipole electromagnets are employed. FIG. 2 shows an example of an SOR ring, in which four superconducting electromagnets A that deflect the beam direction by 90 degrees are used. B is a quadrupole electromagnet for beam focusing, C is a perturbator, and D is an inflector-1E.
is a high frequency acceleration cavity.

Now, when several superconducting electromagnets that operate simultaneously in one system are used in this way, according to the conventional technology, the same number of power supplies for operating the electromagnets as the number of electromagnets are used. This is because electromagnets operating in persistent current mode are
Typically, one cryostat 1, as shown in Figure 3,
One superconducting coil 2 is housed inside, and one persistent current switch 3, one set of current lead wires 4, and one power supply 5 are connected to this coil, and the operation of excitation → persistent current mode → demagnetization is controlled by the above power supply. This is because it is done according to 5.

However, according to this method, the power supply, persistent current switch,
Since the number of current lead wires used increases, the production cost per system inevitably increases.

On the other hand, as shown in FIG.
It is possible to connect a plurality of coils 2 housed in a system in series and operate them using one power supply 5, and by adopting this method, the number of power supplies used per system can be reduced. However, in this case, since the current lead wire 4, which is kept at room temperature, is inserted into the connection between the coils, external heat transmitted through the wire and Joule heat generated in the lead wire itself may enter the cryostat 1. , the amount of evaporation of the refrigerant liquid (generally liquid helium) inside the cryostat increases.

Therefore, the running cost of the system increases.

Further, since lead wires at room temperature are inserted between each coil, the number of persistent current switches 3 cannot be reduced.

This invention was made in view of the above, and aims to enable an economical configuration and economical operation of a charged particle deflection device using a superconducting electromagnet.

[Means for solving problems]

The present invention provides a second cryostat that is separate from the first cryostat that houses superconducting coils individually, and connects all of the first cryostat to the second cryostat via a heat-insulating pipe, thereby making it possible to connect the superconducting coils to the second cryostat. makes it possible to connect several electromagnets in series, thereby achieving the aforementioned objective.

That is, as shown in FIG. 1, each of the superconducting coils 2 is
Each cryostat 1 is housed separately in the same number of cryostats 1, and each cryostat 1 is communicated with a second cryostat 6 provided separately through a heat insulating tube 7, and each of the coils 2 is connected through the second cryostat 6. The superconducting wires 8 are connected in series through the insulated tube 7, and the lead wires on one side of the coils at both ends have a pair of superconducting wires that pass through the inside of the insulated tube 7 and reach the second cryostat 6. Connect line 9. In addition, this pair of superconducting wires 9 is connected in the second cryostat to a pair of current lead wires 4 facing inside the cryostat from the outside, and the pair of superconducting wires 9, 9
One persistent current switch 3 is connected between them, and the pair of current lead wires 4 are connected to one power source 5. 1
0 indicates that the refrigerant is not present.

Note that the heat insulating tube 7 is similar to the cryostat.

Use a highly insulating material whose outer surface is covered with a vacuum insulation layer, a heat reflection layer, a cooling cypress containing liquid nitrogen, etc.

[Effect]

If a second cryostat is provided and each of the first cryostat is connected through a heat insulated tube, the required number of coils (three in the figure, but not limited to this) can be connected in series without exposing the connecting wire between the coils. All electromagnets can be operated in persistent current mode using one power supply, one persistent current switch, and one set of current leads.

〔effect〕

As described above, according to the present invention, the second cryostat, which houses one set of current lead wires and one persistent current switch, is installed in an insulated tube separately from the first cryostat, which houses superconducting coils individually. A required number of coils are connected in series with a superconducting wire that is connected to each of the first cryostat and passes through the second cryostat, and a lead wire on one side of both magnets at both ends is connected to a pair of current lead wires in the second cryostat. Since the configuration is such that the two superconducting magnets are connected via a pair of superconducting wires, and a persistent current switch is inserted between the pairs of superconducting wires, the power supply, persistent current switch, and current lead wire required for simultaneous operation of several superconducting electromagnets is required. 1 unit,
It is possible to construct an economical charged particle deflection device by requiring only one device or one set.

In addition, since only one set of current lead wires is required, which acts as a path for external heat to enter and causes Joule loss, the amount of evaporation of the refrigerant liquid placed in the first and second cryostats and the insulated tubes is greatly reduced. An advantageous effect can also be obtained in terms of running costs of the device.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the apparatus of the present invention, and FIG. 2 is a diagram showing the apparatus of the present invention.
A plan view showing an example of a RIJ song, and FIGS. 3 and 4 are diagrams showing the configuration of a conventional device. 1... Cryostat, 2... Superconducting coil, 3
... Persistent current switch, 4... Current lead wire, 5.
...Electromagnet power supply, 6...Second cryostat, 7
...Insulated pipe, 8...Superconducting wire for coil connection, 9...
・Pair of superconducting wires, 10... Refrigerant liquid Figure 1 □ Figure 73 "-:]-

Claims (1)

[Claims] Each of several superconducting electromagnets for charged particle deflection placed in the middle of a particle trajectory is individually housed in the same number of first cryostats, and each of the first cryostat has one set of current lead wires and a pair of superconducting wires described below. The electromagnets are connected to a second cryostat containing a persistent current switch connected therebetween via an insulated tube, and each of the electromagnets is connected to a superconducting wire passed through the insulated tube via the second cryostat. Furthermore, the lead wires on one side of the electromagnets at both ends are connected to the above-mentioned pair of current lead wires, which are connected to one power source via a pair of superconducting wires that run through an insulated tube to the second cryostat. A charged particle deflection device for the synchrotron orbital radiation system.