JP2652703B2 - Deflection magnet for synchrotron radiation ring - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a SR magnet deflection magnet used for deflecting the orbital direction of accelerating particles in a synchrotron radiation (hereinafter abbreviated as SR) ring. .

[Prior art] A cylindrical duct, which is one of the components of the SR ring and forms a cavity in which accelerating particles fly, has superconducting coils on its outer peripheral surface to change the flight direction of the particles. Provided. Incidentally, as a technique relating to a deflection magnet for changing the particle flight direction, for example, Japanese Patent Application Laid-Open No. 61-22 / 1986
It is disclosed in JP-A-7400.

By supplying power to such a superconducting coil, an electromagnetic force is generated in the superconducting coil, but this superconducting coil deforms itself and changes the magnetic field in the duct, so the desired performance as an SR ring is exhibited. I can no longer do it. Therefore, in order to prevent the deformation of the superconducting coil as described above, the superconducting coil is fixed to the duct and the superconducting coil by tightening in the direction of the center of the duct with a clamp material or a stainless steel collar covering the superconducting coil. . In addition, if necessary, the conductor forming the superconducting coil is wound and fixed with a tape coated with semi-cured epoxy resin, thereby increasing the rigidity of the conductor itself and fixing the duct and the superconducting coil with a stronger force. Was.

[Problems to be Solved by the Invention] As described above, when a clamp material, a collar, or the like is used for fixing the superconducting coil, the superconducting coil is tightened by the clamp material, the collar, or the like. Requires rigidity to withstand this tightening force. Therefore, the wire diameter of the conductor must be increased to some extent. However, in order to obtain a desired magnetic field, either the winding space of the superconducting coil is increased or the exciting current supplied to the superconducting coil is increased. It is disadvantageous in terms of space, and there is a disadvantage that increasing the exciting current increases the amount of heat generated at the connection between the superconducting coil and the power supply and consumes a large amount of refrigerant for cooling it.

In addition, as a coil used in the SR ring to deflect the direction of flight of the particles, in addition to the conventional two-pole coil, a four-pole coil is added to the outer peripheral surface of the duct to ensure the deflection. There is an SR ring provided. The wire diameter of the coil conductor used for such a four-pole coil is:
The diameter is about 1 mm, which is smaller than the wire diameter of the coil conductor used for the conventional coil. By using such a thin coil conductor, the above-mentioned problem of heat generation is solved, but when using a collar or the like for preventing deformation of the coil,
Since the rigidity of the coil conductor is small, there is a problem that it is difficult to firmly fix the four-pole coil to the duct.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and uses a collar or the like in an SR ring deflection magnet having a quadrupole coil formed using a coil conductor having a small wire diameter. It is an object of the present invention to provide a deflection magnet for an SR ring that can firmly fix the quadrupole coil to a duct without doing so.

Means for Solving the Problems According to the present invention, a quadrupole coil is arranged on the same circumference on the outer circumferential surface of a cylindrical curved duct through which accelerating particles fly and in the circumferential direction of the duct, and the quadrupole coil is arranged on the same circumference. The outer peripheral surface of the coil is hardened with resin, and the four-pole coil is arranged in contact with the outer peripheral surface of the duct.

[Example] In FIG. 1 showing one embodiment of the present invention, a cylindrical duct 1 on which accelerating particles fly has a flight direction of the particles.
It is bent at an appropriate radius so that it turns 90 degrees. On the outer peripheral surface of the duct 1, a four-pole coil 2, a resin sheath 3, a two-pole coil 4, and a collar 17, which will be described later, are sequentially provided in layers. Reference numeral 50 denotes spacers provided at both ends of the duct 1 for suppressing the electromagnetic force in the circumferential direction of the 4-pole coil 2 and the 2-pole coil 4. Also, at both ends of the duct 1,
A flange for connecting this duct 1 to another adjacent duct (not shown) constituting another passage of the same synchrotron
15 are provided.

As shown in FIG. 2, superconducting coils 2a to 2d are in close contact with outer peripheral surface 1a at positions where outer peripheral surface 1a of duct 1 is divided into four equal parts. In other words, the superconducting coil 2a
The superconducting coil 2b is installed in the range of 270 degrees and the duct 1
The superconducting coil 2c is mounted in a range from 180 degrees to 90 degrees, and the superconducting coil 2d is mounted in a range from 180 degrees to 270 degrees. And superconducting coil 2
The quadrupole coil 2 is formed by a to 2d. Superconducting coil 2
Reference numerals a to 2d denote coil conductors each having a wire diameter of about 1 mm wound around a four-pole coil core 5 in multiple layers, for example, 12 layers, and are examples of mounting on the outer peripheral surface 1a of the duct 1. As shown in FIG.

The four-pole coil 2 is molded on the outer peripheral surface with a resin sheath 3 and is firmly fixed to the outer peripheral surface 1a of the duct 1.

Next, the superconducting coils 4a and 4b are in close contact with the outer peripheral surface 3a at positions where the outer peripheral surface 3a of the resin outer cover 3 is equally divided in the circumferential direction. That is, the superconducting coil 4a is 270 degrees, 0 degrees, 90 degrees of the duct 1.
The electromotive coil 4b is attached to the duct 1
It is mounted in the range of degrees, 180 degrees and 270 degrees. Then, the bipolar coil 4 is formed by the superconducting coils 4a and 4b.

Each of the electromotive coil 4a and the superconducting coil 4b is formed by winding a coil conductor having a rectangular cross section around the two-pole coil core 6, as shown in FIG. In such a form, it is mounted on the outer peripheral surface 3a. Further, the superconducting coils 4c and 4d having the same configuration as the above-described superconducting coils 4a and 4b
And 4b in close contact with the outer peripheral surface. That is, the superconducting coil 4c is installed in the range of 270 degrees, 0 degrees, and 90 degrees of the duct 1, and the superconducting coil 4d is installed in the range of 90 degrees, 180 degrees, and 270 degrees of the duct 1. Then, a bipolar coil 4 'is formed by the superconducting coils 4c and 4d. The two-pole coil core 7 around which the coil conductor is wound is formed by an arc larger than the two-pole coil core 6.

The installation positions of the bipolar coils 4 and 4 'are not limited to the above-described positions, and it is sufficient that the pole centers of the bipolar coils 4 and 4' coincide with each other. There is no regulation on the coil thickness of the two-pole coils 4 and 4 '.

Furthermore, in the present embodiment, the relative installation positional relationship between the two-pole coil and the four-pole coil is not limited to this, but the pole centers of the four-pole and two-pole coils are shifted by 45 degrees. An appropriate angle other than the coincident angle may be used.

As described above, the two-pole coils 4 and 4 ′ formed on the outer peripheral surface 3 a of the resin sheath 3 over two layers have a semi-cylindrical cross-sectional shape concentrically bent with the duct 1 and are provided at both ends in the circumferential direction. A flange 16 having a rectangular cross-section and projecting in the diameter direction
Covered by collars 17a and 17b with collar 17a
The collars 17a and 17b are compressed toward the center of the duct 1 by tightening the respective flanges 16 and 17b with the tightening bolts 18, and the two-pole coils 4 and 4 'are fixed to the outer peripheral surface 3a of the resin sheath 3. .

With the above-described configuration, in a deflection magnet in which a quadrupole coil 2 formed using a coil conductor having a small wire diameter and a dipole coil 4 are combined to more reliably deflect the flight direction of the accelerating particles. The four-pole coil 2 can be fixed to the outer peripheral surface 1a of the duct 1 by the resin sheath 3, and it is not necessary to consider the rigidity of the coil conductor as in the case of fixing with a collar as in the related art, and the collar is not required. Since it is unnecessary, there is an advantage that it can be easily combined with the two-pole coil 4.

Further, since it is not necessary to consider the rigidity of the coil conductor, the wire diameter of the coil conductor used for the superconducting coil can be reduced, and the current for exciting the superconducting coil can be reduced. Therefore, heat generation at the connection portion of the superconducting coil and the like is suppressed, and the consumption of the refrigerant can be reduced.

In this embodiment, since the quadrupole coil 2 is provided on the outer peripheral surface 1a of the duct 1, the cooling of the quadrupole coil 2 is performed by directly cooling the duct 1. Therefore, since the inner peripheral surface of the duct 1 is extremely low in temperature, the release of gas from the inner peripheral surface of the duct 1 is suppressed, so that the inside of the central cavity of the duct 1
This is advantageous for keeping 1b in an ultra-high vacuum of about 10 ^-10 Torr.

Hereinafter, a method of forming the resin sheath 3 for fixing the four-pole coil to the duct 1 will be described.

The duct 1 in which the four-pole coil 2 is mounted on the outer peripheral surface 1a has an inner peripheral surface 8c having an inner diameter slightly larger than the diameter of the outer peripheral surface 2e of the four-pole coil 2 as shown in FIG. 1 inside the cylindrical mold 8 extending along the axial direction of the duct 1 with the same radius of curvature as the inner peripheral surface of the mold 8
Installed concentrically with 8c. Therefore, a uniform space 13 is formed over the entire circumference between the outer peripheral surface 2e of the quadrupole coil 2 and the inner peripheral surface 8c of the mold 8. In addition, the mold 8
Is a semi-cylindrical structure that can be divided into two in the diameter direction.
At the circumferential ends of the divided molds 8a and 8b, plate-like flanges 12a and 12b having a rectangular cross-sectional shape project in a state in which they protrude outward in the diameter direction of the mold. Or 8b in the axial direction of 8b or 8b
And formed integrally with it. Flange formed in this way
The mold die 8a and the mold die 8b are united by fastening the flange 12b to the flange 12b with the fastening bolt 9.
In addition, a resin discharge port 11 and a resin injection port 10 projecting diametrically from the outer peripheral surfaces of the mold dies 8a and 8b are provided in the mold 8.
Are formed in the resin inlet 10 and the resin outlet 11, respectively, through holes penetrating the outside and the inner peripheral surface 8 c of the mold 8.
14 has been opened.

As described above, the duct 1 provided with the quadrupole coil 2 is installed inside the mold 8 as described above, and the resin is injected into the mold 8 from the resin injection port 10 to form the space 13. Is filled with resin. And resin outlet
By injecting the resin until the excess resin is discharged from the space 11, the space 13 is uniformly filled with the resin, and the quadrupole coil 2 is covered with the resin. When the resin has hardened, the mold 8 is removed.

By using the molding die 8 to form the resin outer cover 3 on the outer peripheral surface of the four-pole coil, the outer peripheral surface of the resin outer cover 3 is formed.
3a can be in a very smooth state,
Can be finished to about ± 0.05mm. Therefore, the use of the mold 8 has an advantage that a finishing process is required after the formation of the resin sheath 3.

[Effects of the Invention] As described above in detail, according to the present invention, the four-pole coil and the duct 1 are fixed by solidifying the outer peripheral surface of the four-pole coil provided on the outer periphery of the particle passage duct of the synchrotron with resin. Thus, the four-pole coil and the duct 1 can be firmly fixed without using a collar or the like, the structure for fixing the coil is simplified, and the outer circumference of the four-pole coil is further increased by two. The pole coil and the like can be easily installed.

[Brief description of the drawings]

1 is a longitudinal sectional view of a deflection magnet showing one embodiment of the present invention, FIG. 2 is a transverse sectional view of FIG. 1, FIG. 3 is a transverse sectional view showing a manufacturing state of a resin sheath according to the present invention, FIG. 4 is a perspective view showing a state in which the four-pole coil is mounted on the duct. 1 ... duct, 2 ... 4-pole coil, 3 ... resin sheath, 4 ... 2-pole coil, 8 ... mold die.

Claims (3)

(57) [Claims] 1. A quadrupole coil is arranged on the same circumference on the outer peripheral surface of a cylindrically bent duct on which accelerating particles fly and in the circumferential direction of the duct, and the outer peripheral surface side of the quadrupole coil is made of resin. A deflection magnet for a synchrotron radiation ring, wherein a four-pole coil is disposed in contact with an outer peripheral surface of the duct. 2. The synchrotron radiation ring deflection magnet according to claim 1, wherein the outer peripheral surface of the resin has irregularities suppressed to a predetermined value or less so that another coil can be fixed to the outer peripheral surface side. 3. The coil conductor of the four-pole coil has a wire diameter of about 1 mm and is a coil wound in multiple layers.
3. The deflection magnet for a synchrotron radiation ring according to claim 1.