JP2001230114A - Split pair superconductive magnet device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a split pair superconductor magnet device which can be lessened in manufacturing cost and in which an entrance hole 12 through which a beam such as a neutron beam impinges is bored at an optional position. SOLUTION: A split pair superconductive magnet device has such a structure in which superconductive coils C and C' are arranged in a double-decked way in a cryostat 1, concentric rings and spacers are provided between the coils C and C' to form a gap G, and a beam B such as neutron beam or the like is made to penetrate through the gap G, where the concentric rings and spacers have such structures in which both edges of C-shaped rings 101, 102, etc., are made to bear against both sides of fan-shaped spacers 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split-pair type superconducting magnet device for transmitting X-rays, neutrons, etc., through a gap between superconducting coils arranged in two stages, upper and lower.

[0002]

2. Description of the Related Art Conventionally, a split pair type superconducting magnet device is known as disclosed in Japanese Patent Application Laid-Open No. H11-312606. In the device disclosed in the above publication, as shown in FIG. 5, a neutron wire is provided between gap portions G formed between the winding frame flanges of the upper hybrid superconducting coil C and the lower hybrid superconducting coil C ′. As means for holding an electromagnetic force between the incident hole and the superconducting coils C and C ', concentric aluminum rings 101, 102 and 103 each having a cutout are provided, and are provided between the rings 101 and 102 and between 102 and 103. It is disclosed that fan-shaped aluminum spacers 111 and 112 are respectively interposed between the two.

However, in the above-described structure, when the number of superconducting coils is increased in the radial direction, if the number of aluminum rings is increased in accordance with the division of the superconducting coils, the total thickness of the aluminum rings becomes constant. To do so, the thickness of each ring is very thin, which not only makes it difficult to assemble with the superconducting coil winding frame, but also when uneven stress is applied at the connection with the flange of the winding frame. There is a risk of destruction.

In the case where the fan-shaped spacer is divided into the same number as the number of coils in the radial direction in accordance with the number of divided coils and is disposed between the aluminum rings, the dimensional accuracy of each divided spacer is reduced. In order to ensure assembly accuracy, it is inevitable that the production cost will increase. In addition, in the above structure, only one neutron beam entrance hole can be provided. There were problems such as inability to respond.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a split-pair type superconducting magnet device capable of reducing the manufacturing cost and drilling a beam incident hole such as a neutron beam at an arbitrary position. The purpose is to do so.

[0006]

A gap G is formed by installing a plurality of concentric rings and spacers between superconducting coils C and C 'which are disposed in two stages in the cryostat 1 and forming the gap G. In a split-type superconducting magnet apparatus that transmits a beam B such as a neutron beam through G, the concentric ring and the spacer are shaped such that both ends of a plurality of C-type rings 101, 102,. Is characterized by being in contact with.

Each of the C-shaped rings 101, 102,... Has a thicker upper and lower end than the body, and is formed in an I-shaped cross section. Groove on the lower surface of each of the lower flanges F1, F2,... And the upper flanges F1 ', F of the lower coil form.
It is characterized in that it is fitted in a concave groove provided in 2 ′,.

[0008]

FIG. 1 is an explanatory view showing the whole of a split pair type superconducting magnet device to which the present invention is applied.
FIG. 2 is a partially enlarged view of FIG. The split pair type superconducting coil has an upper coil C and a lower coil C ′ so as to form a gap G for transmitting a beam B such as an X-ray or a neutron beam.
(Detailed structure will be described later), and is installed in a cryostat (vacuum cooling vessel) 1 via supports 2 and 2 ′.

The means for cooling the superconducting coil is disclosed in
The cooling is performed by a known means as disclosed in Japanese Patent Publication No. 312606. In the example shown in the figure, the cooling flanges F1, F2, F3, and F4 of the respective winding frames of the upper coil C of the hybrid type are bolted to the upper surface of the heat load flange 3 via the heat transfer plate 4 in the two-stage stage of the GM refrigerator R. And the heat load flange 3 'bolted to the lower surfaces of the cooling flanges F1', F2 ', F3', F4 'of the winding frames of the lower coil C' of the hybrid type. Coil C, C ′
Is cooled until it becomes superconductive.

Reference numeral 6 denotes a heat shield plate, 6 'denotes a heat shield cylinder, and 7 denotes an aluminum cylinder penetrating through the center of the cryostat 1 and has a room temperature region. You. Numeral 8 denotes a beam incidence window provided on the wall of the cryostat, which is closed with an aluminum alloy plate when the beam is a neutron beam and with a beryllium plate when the beam is an X-ray. The heat shield plate 6 is also provided with a beam incident window 9 similar to the above.

Reference numerals 101, 102, 103, 104 and 105 denote C-type rings made of CFRP or aluminum alloy disposed between the gaps G, and the material of the rings is such that a beam B incident on the gaps is an X-ray. In this case, CFRP is selected, and in the case of a neutron beam, an aluminum alloy is selected.

FIG. 3 is a sectional view taken along line AA of FIG. 11
Is a fan-shaped spacer provided between the gaps G, and is positioned and fixed to the flange by positioning pins and bolts provided on the lower flange F4 of the upper coil frame and the upper flange F4 'of the lower coil frame, respectively. . Reference numeral 13 denotes a thermal anchor for thermally connecting a coil outer peripheral cooling plate (not shown) to the lower flange F4 of the upper coil former and the upper flange F4 'of the lower coil former.

The aforementioned C-shaped rings 101, 102, 103,
10 4, the upper and lower end portions are made thicker than the body portion to form an I-shaped cross section, and the upper and lower end portions of each ring are formed on the lower surfaces of the lower flanges F 1, F 2, F 3, F 4 of the upper coil form. The groove provided and the upper flange F1 'of the lower coil winding frame,
F2 ', F3', are fitted into the grooves provided in F4 ',
Both ends of each ring are fixed in contact with both side surfaces of the fan-shaped spacer. The outermost C-shaped ring 105 is bolted to the lower flange F4 of the upper coil bobbin and the end face of the upper flange F4 'of the lower coil bobbin.

FIGS. 4A and 4B are explanatory views of a C-shaped ring and a spacer installed in the gap portion, wherein FIG. 4A is a plan view and FIG. 4B is a front view. Beam entrance holes 12 are provided in the body of each C-shaped ring.
Are drilled. In the illustrated example, two entrance holes are provided on both sides of a fan-shaped spacer having a central angle of 90. However, the central angle of the spacer may be any acute or obtuse angle, and the number and location of the incident holes can be arbitrarily selected. .

In the present invention, the C-shaped ring has an I-shaped cross section, and the portion fitted into the concave groove of the bobbin flange is made thick, so that the mechanical strength of the portion is increased and the beam passes through. By making only the part thin, the total thickness of each ring can be kept below a predetermined thickness. Furthermore, it is easy to accurately assemble the ring at an angle of 90 degrees by widening the contact surface of the ring with the reel flange.

[0016]

According to the present invention, a fan-shaped spacer is integrally formed without forming a plurality of spacers in the gap portion as in the prior art. The thick parts of the upper and lower end surfaces of the ring are fitted into the concave grooves of the coil form flange, and both ends of the ring are fixed to the both sides of the spacer, so high-precision assembly of split pair type superconducting magnets is possible. Quick and easy now.

Further, in the present invention, since the C-shaped ring has an I-shaped cross-section, a portion to be fitted into the concave groove of the bobbin flange becomes thicker, and the mechanical strength of the portion is increased. By making only the passing portion thin, the total thickness of each ring can be kept below a predetermined thickness, and the angle of attachment to the bobbin flange can be reduced by 90 degrees.
This has an effect that it is easy to accurately assemble each time.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an entire split pair type superconducting magnet device according to the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a sectional view taken along line AA in FIG. 1;

4A and 4B are explanatory views of a fan-shaped spacer and a C-shaped ring according to the present invention, wherein FIG. 4A is a plan view and FIG.

5A and 5B are explanatory views of a conventional split-pair type superconducting coil, wherein FIG. 5A is a longitudinal sectional view and FIG. 5B is a sectional view taken along line XX of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cryostat (vacuum cooling container) 2, 2 'Support 3, 3' Heat load flange 4 Heat transfer plate 5 Heat conductor 6 Heat shield plate 6 'Heat shield cylinder 7 Aluminum cylinder 8, 9 Beam incidence window 10 ( 101, 102-) C-type ring 11 Fan-shaped spacer 12 Beam incident hole 13 Thermal anchor B-beam C Hybrid-type upper coil C 'Hybrid-type lower coil F (F1, F2 ...) Upper coil frame flange F' ( F1 ', F2' ...) Lower-stage coil winding flange G Gap R GM refrigerator S Sample

Claims (3)

[Claims] A plurality of concentric rings and spacers are provided between superconducting coils (C) and (C ') disposed in two stages in a cryostat (1) to form a gap (G). In a split-type superconducting magnet device that transmits a beam (B) such as a neutron beam through the gap (G), the concentric ring and the spacer have a fan-shaped spacer (1).
A plurality of C-type rings (10 1), (10
2) A split-pair type superconducting magnet device characterized in that both ends of the contact are in contact with each other. 2. The C-shaped rings (101), (102),... Each having an upper and lower end portion having a greater thickness than a body portion and having an I-shaped cross section. Split-pair type superconducting magnet device. 3. Upper and lower end surfaces of each of the C-shaped rings (101), (102),... Are provided on lower surfaces of lower flanges (F1), (F2),. The groove is fitted in the groove provided in the upper flange (F1 '), (F2'),... Of the lower coil winding frame.
The split pair type superconducting magnet device as described in the above.