JPH03220500A - Coil for charged particle bending electromagnet - Google Patents

Abstract

PURPOSE:To enable elimination of arrangement limit and lessening of an occupation space of a coil by placing a bobbin block between main and adjusting coils made of continuous leads having no connection part, for the purpose of magnetic field generation, and by housing them in a common vessel. CONSTITUTION:A super-conducting coil 1a constituting an electro-magnet, consists of super-conductive main coil and adjusting coil 4 and 5 and, after completion of a winding work of the coil 5, the continuous coil 4 is wound by making the lead to be a crossing part 10, as it was. Then, a bobbin block 12, being shaped to have a predetermined width, is inserted between the both coils 4 and 5 at arbitrarily designated relative positions. This coil 1a is supported and fixed to the inside of a monolithic bobbin 11 of a common vessel. In this way, both coils 4 and 5 are continuously wound and are housed in the common bobbin 11 and therefore there is no connection point, the performance can be much improved and an occupation space is diminished, as well. Moreover, gap length between both coils 4 and 5 can be arbitrarily selected by the block 12 and a magnetic field conformable to specifications can be firmly obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coil for a charged particle deflection electromagnet used, for example, in a synchrotron radiation light generating device.

[Conventional technology]

Charged particles using a superconducting bending electromagnet, in which a semicircular superconducting main coil and a superconducting correction coil, each made of a conductive wire made of a superconducting material and curved in accordance with the particle trajectory, are arranged opposite to each other with the particle trajectory in between. The device is, for example, disclosed in Japanese Patent Application Laid-Open No. 1986-
There are those shown in Japanese Patent Application Laid-open No. 2300 and Japanese Patent Application Laid-Open No. 61-294800.

That is, FIG. 5 is a principle diagram of a charged particle device of the same type as that shown in the above-mentioned Japanese Patent Application Laid-Open No. 64-2300. Charged particles incident through an injection section and an acceleration section (not shown) are It moves on an elliptical orbit (21) by two opposing superconducting bending electromagnets (1).

By the way, the superconducting coil (la), which is the main component of the superconducting bending electromagnet (1), is a superconducting coil made of a superconducting wire (β) made of a superconducting material, as shown in FIGS. 6 and 7. It consists of a main coil (4) and a superconducting correction coil (5), and both of these coils (A) and (5) are connected to the particle trajectory (
2) are placed vertically facing each other. Both the superconducting main coil 4 and the superconducting correction coil (5) are curved in a semicircular shape with a predetermined curvature so as to protrude in the direction of the outer diameter of the particle trajectory (2), and are curved in the inner diameter direction of the particle trajectory (2). The inner diameter part (4a) (5a) located on the side and the particle trajectory (2)
It is divided into an outer diameter part (4bH5b) located on the outer diameter direction side and curved both end parts (4c) (5c). Both coils (41 (51) configured in this way are cooled to an extremely low temperature of -268°C, for example, and become superconducting. By passing current through them, a magnetic field with a high magnetic flux density of several Tesla is obtained.
Due to this magnetic field, the trajectory (2) of the charged particles is deflected as shown in the figure.

FIG. 8 is a perspective explanatory view showing the manufacturing process of a superconducting coil (1a) of a conventional superconducting bending electromagnet disclosed in, for example, Japanese Patent Application Laid-Open No. 61-294800.
is rolled up a predetermined number of times in the Z-axis direction in the figure to form the first layer,
Next, the second layer is rolled up along its outer periphery, and the winding is continued in this manner until the required number of layers is reached. The completed coil is the main coil (
4), the correction coil (5) into each coil container (6)
After being accommodated and supported, the coil is fixed to the base opening. Thereafter, as shown in FIGS. 10 and 11, a current lead f81 is provided, but in FIG. 10, the main coil (
A) and the correction coil (9) are connected, and the first
FIG. 1 shows a case where the main coil (2) and the correction coil (51) are each provided with a current lead (8).

[Problem to be solved by the invention]

In the conventional charged particle bending electromagnet coils described above, the coil container requires a volume sufficient to support the electromagnetic force acting on the coil, so the volume occupied by each coil is large, and the main coil The distance from the correction coil also needs to be at least a certain distance.

Therefore, there are restrictions on the selection of the relative arrangement of the main coil and the correction coil, and the form of the magnetic field that can be generated by both coils is also restricted within a certain range.

In addition, especially in the case of superconducting coils, when a lead is attached as shown in Figure 10, there is a connection between the main coil and the correction coil, so due to the influence of so-called connection resistance, the persistent current When operating in this mode, the attenuation of the current and the generated magnetic field is significant, leading to deterioration in the performance of the superconducting coil. Furthermore, as shown in FIG. 11, if many current leads are used, there is a problem in that the amount of heat entering the superconducting coil increases.

The present invention has been made in order to solve these problems, and is designed to reduce restrictions on the arrangement of coils within a deflecting electromagnet, reduce the space occupied by the coil, and provide a charged particle deflecting electromagnet without deterioration of performance due to conductor connections. The purpose is to obtain a coil for use.

[Means and effects for solving the problem] The coil for a charged particle deflection electromagnet according to the present invention has a main coil and a correction coil formed into an ellipse including a continuous conductive wire without a connecting part, and A winding flock is interposed between the two coils to ensure the spacing necessary for generating a magnetic field, and both the coils are housed in a common container.

The performance of the coil is improved by eliminating the conductor connection part, and since both coils are housed in a common container, restrictions on arrangement are eliminated and the space occupied by the coils is also reduced.

〔Example〕

Figures 1 and 2 show one embodiment of the present invention, and Figures 3 and 4 show other embodiments. The parts shown are the same or equivalent parts.

In the embodiment shown in Figs. 1 and 2, a superconducting bending electromagnet (
The superconducting coil <la) constituting 1) is the main coil (4
) and a correction coil (5), and the winding direction of the conducting wires in both is the same. And the correction coil (
When the winding work 5) is completed, the conductor is left as it is at the crossing portion αO), and then the winding work of the main coil (4) is continued to perform the required winding. A winding block (12) formed to a predetermined width is inserted between both coils (A) (51), and both coils (41 (51) are configured so that they are in an arbitrarily specified relative position. The superconducting coil (Ia) manufactured in this manner is supported and fixed within an integral winding frame (11), which is a common container, as shown in FIG.

In addition, as shown in Figure 3, the conductor is reversed at the crossing point 00), and the winding direction of the main coil (2) is changed to the correction coil ((5).
), it is possible to manufacture a superconducting coil (la) comprising a main coil (a) and a correction coil (9) with different current direction.

Furthermore, as shown in FIG. 4, a second correction coil (5a) can be provided inside the correction coil 4. In this case, during manufacturing, the correction coil (5), the second correction coil (5a), Although the winding work is performed successively to the main coil (A) via the crossing section QO), the winding direction may be different from each other.

As described above, in these embodiments, both coils (4
1 (5) in succession, and both are wrapped around a common integrated winding frame (
11), the connection point (9) is eliminated, improving the performance of the superconducting coil and reducing the space occupied by the coil. Furthermore, since the spacing between the coils (a) and (5) can be set to any size using the winding block (12), a magnetic field of the required specifications can be reliably obtained.

Note that in carrying out this invention, the height in the winding direction and the size of the coil cross section of each coil do not necessarily have to be the same, and there may be a step between the coils or the coil cross section may be different. . There is also no limit to the number of coils.
Furthermore, copper wire or other conductive material other than superconducting wire may be used as the coil constituent wire.

〔Effect of the invention〕

Since the present invention is constructed as described above, there is no connection point between the main coil and the correction coil, which improves the performance of the coil and reduces the space occupied by the coil within the deflection electromagnet. Furthermore, since the spacing between both coils can be arbitrarily selected, the required magnetic field can be reliably obtained.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view of a superconducting coil according to an embodiment of the present invention, FIG. 2 is a sectional view showing an example of housing the superconducting coil shown in FIG. 1, and FIG. 3 is a partial perspective view of another embodiment. FIG. 4 is a sectional view showing still another embodiment and its accommodation state, FIG. 5 is a diagram explaining the principle of the charged particle device, FIG. 6 is a plan view showing a conventional superconducting coil, and FIG. ■－■
8 is an explanatory diagram showing the manufacturing process of a conventional superconducting coil, FIG. 9 is a partial perspective view of a conventional superconducting coil and its housing structure, and FIGS. FIG. 3 is a cross-sectional view showing current lead attachment means for a superconducting coil. In the figure, (1) is a superconducting bending electromagnet, (la) is a superconducting coil, (21 is a particle orbit, (a) is a superconducting main coil, (9 is a superconducting correction coil, αO) is a crossing part, (II)
is an integrated winding frame as a common container, and (12) is a winding form block. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A main coil and a correction coil each formed by winding a conducting wire and arranged at a predetermined interval in order to generate a magnetic field necessary for deflecting charged particles, and a container that accommodates and supports these coils. The above-mentioned coils are constructed of a continuous conductor without a connecting part, including the crossing part, and a winding block is interposed between the above-mentioned coils to ensure the above-mentioned interval. A coil for a charged particle deflection electromagnet, characterized in that the coil is housed in a common container.