JPS58186914A - Superconductive magnet apparatus - Google Patents

Abstract

PURPOSE:To firmly hold a superconductive coil within a helium container while cooling process and ease an electromagnetic force working on a super-conductive coil by arranging a reinforcing member consisting of aluminium or aluminium alloy having a line expansion coefficient larger than that of copper at the outside of superconductive coil mainly consisting of copper and accommodating it within the helium container. CONSTITUTION:The figure shows a sectional view. 2 indicates a helium container, and the outside of superconductive coil 1 is surrounded by a reinforcing member 8 consisting of aluminium or aluminum alloy through a spacer 7 consisting of an insulator. Moreover, cotters 5, 6 may be inserted between the superconductive coil 1 and reinforcing member 8 in place of the spacer 7. The helium container 2 itself may be formed with aluminium or aluminium alloy and the cotters 5 and 6 may be inserted as the reinforcing members 8. In case the reinforcing member 8 is formed by aluminium or aluminium alloy, contraction of reinforming member 8 consisting of aluminium or aluminium alloy is more distinctive than that of copper. A shrinkage fit allowance is given rather than forming clearance between the superconductive coil 1 and the reinforcing member 8 and thereby the superconductive coil 1 and helium container 2 can be combined more stringly.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is directed to superconducting;
This invention relates to a conductive magnet device.

[Technical background of the invention]

Fig. 1 An example of a superconducting Madanet device [In the figure shown, one superconducting conductor is wound to form a superconducting coil. This coil 1 liquid helium is stored in a helium container 2. A helium container b2 is housed in a vacuum container 3. The space between the helium container 2 and the helium container 3 is maintained at 9 and vacuum insulation is provided.

In addition, there is a radiation shield 411 between the helium reaction koji 1 and the true 9 containers S and 0 to prevent radiant heat from entering the tube.

In order to maintain the strength of such superconducting coils, the superconducting coil 1 has recently been exposed to a very strong field, and due to the large electromagnetic force acting on it, the superconducting coil 1 itself cannot maintain its mechanical strength. Attempts have been made to transmit part of the electromagnetic force to the hesium capacitor 1 to eliminate the stress t@ applied to the superconducting coil 1. Figure 2 is a cross-sectional view showing the main parts of a superconductor with such a configuration. 5
．． Insert 6. In other words, Cottater 5 [Helium container 1
This book-5, superconducting coil 1 and O
This is intended to efficiently transmit black electromagnetic force acting on the superconducting coil 1 to the helium container 1 by inserting a colander 61 into the superconducting coil 1.

[Problems with background technology]

However, when the superconducting coil 1 is made of copper (the main component of the superconductor of the superconducting coil 1 is copper), when cooling to a low temperature due to the difference in coefficient of thermal expansion, even if the superconducting coil 1 is cooled to a low temperature from 300 K to 4. 2K”1
When cooling the superconducting coil IK, a gap of 1 or more is generated between the two, and the electromagnetic force applied to the superconducting coil IK cannot be transmitted to the helium reactor 2. This imposes excessive stress on the super-IIL conductor IK, 9 which may lead to destruction of the superconductor. Furthermore, if a force of 1 gcm is applied to the superconducting conductor in such a situation, movement will occur between the conductors, and due to the heat generation force, there is a possibility that the required rated magnetic field sound cannot be generated.

[Purpose of the invention]

The present invention was made in view of the above-mentioned circumstances, and a reinforcing member made of aluminum or aluminum alloy is inserted between the superconducting coil and the helium container to firmly connect the two, thereby acting on the superconducting coil. The objective is to provide a superconducting magnet device tube that can eliminate the electromagnetic force V*.

[Value of invention]

That is, the present invention is to surround the outer periphery of a super IIE conductive coil with a reinforcing member made of aluminum or an aluminum alloy and to hold it in a helium container.

[Embodiments of the invention]

An embodiment of the present invention will be described in detail below with reference to FIGS. 3 and 4. 311I is a cross-sectional view, in which 1 is a superconducting coil and 2 is a helium container.

The superconducting coil 1 is surrounded by a reinforcing member 8 made of an aluminum paddle or an aluminum alloy through a spacer 1 made of an insulating material on the outside of the superconducting coil 1. A member that extends around the circumference of the circular coil may also be used.As shown in FIG.
6 [You may insert 11 helium container 1
Reinforcement member 8t made of aluminum alloy or aluminum alloy
- As shown in FIG.
may be inserted.

#! Figure 5 shows the tensile modulus of aluminum, copper, and stainless steel.
*Indicates tensile strength. In FIG. 5, the coefficient of linear expansion of each material is IIIK for aluminum, copper, and stainless steel.

On the other hand, M114: 1 h1, helium container 2, etc. are assembled at room temperature during manufacture, and when the 1111c resistor is used as a superconducting coil, liquid helium II & armpit 4.2 are used. It must be cooled in stages. The heat shrinkage rate Δ1 at this time is Oi! It is given by the following equation 1) from the average linear expansion coefficient α of the member during the temperature difference 41 from 4.2 to 4.2.

Δj;αXΔT River···························· 1) That is, by making the reinforcing member 8't aluminum or aluminum alloy, the amount of shrinkage of the reinforcing member 8 made of aluminum alloy or bearing <t is larger than that of copper. In other words, instead of creating a gap between the superconducting coil 1 and the reinforcing member 80, a 1-coin allowance is provided, and the superconducting coil 1 and the helium container 2 can be coupled in the 9M direction. Also silk 5
As is clear from the figure, in the conventional 1-stainless steel combination, the superconducting coil located in the center and made mainly of copper shrinks more than the helium container made of stainless steel on the outside, so there is no gap between them. It is clear that this will occur. ! Although there are materials other than 7t aluminum and aluminum alloys that have a higher tensile modulus than copper, aluminum or aluminum alloys are most preferred in terms of manufacturability, economy, strength, etc.

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, the reinforcing member 8t made of aluminum or aluminum alloy is generally used around the entire circumference of the coil 1, and a part of the reinforcing member is made of a seven-pronged aluminum alloy. Other parts may be combined with other members 1 to reinforce the superconducting coil.

〔Effect of the invention〕

As described above, the present invention places a reinforcing member made of aluminum or aluminum alloy, which has a higher coefficient of linear expansion than copper, on the outside of a superconducting coil mainly made of copper, and stores the reinforcing member of seven helium s*rc. When the superconducting coil is cooled down, the superconducting coil can be held in place by the superconducting magnet, which can eliminate the electromagnetic force acting on the superconducting coil! It is difficult to provide direct service.

Figure 1 is an example of a conventional superconducting magnet device.
l! IT plan view, FIG. 2 is a view showing the main part 1 of a conventional superconducting magnet device, 1llN3 is a sectional view showing an example of the present invention, and FIG. 4 is a view showing the main part of another embodiment of the present invention. ,
FIG. 5 is a diagram showing the line II# elongation of the probe material.

1...Superconducting coil, 1...Helium! ! Vessel, 3.
...)? ! ! Vessel, 4... - Shooting shield, 5.6...
・Tips/-1 Fu 8. Spacer, 8... reinforcing member.

Applicant's agent: Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (υ It is OK to store a superconducting coil with a superconducting conductor in a helium container, and the outside of the noodle conductive pool is insulated! Hold it in the helium container with the reinforcing member 10.
A superconducting magnet device. (No. The superconducting net characterized in that the reinforcing member tube is shaped like a circular ring, and an insulating material is inserted between the reinforcing member, the superconducting twill, and the superconducting twill. Apparatus. (a) O described in claim 2 also includes:
A wedge-shaped insulating material was inserted between the reinforcing member and the superconducting wire. Gnet device. (Article 1, 19 of the 4% Claims WA applies to the thing described in Paragraph 2, where the heart helium capacity is
A superconducting magnet device with t% mold and 4 superconducting magnets made of Kusunoki materials.