Cold-guided superconducting magnet based on annular superconducting sheets

Abstract

The invention discloses a cold-guided superconducting magnet based on annular superconducting sheets, and belongs to the field of superconducting magnet application. The superconducting magnet is composed by alternately stacking the annular superconducting sheets and insulating Cu sheets from bottom to top, wherein flanges are added at the top and bottom respectively, and fixed connection is performed through an insulating pull rod. The annular superconducting sheets and the insulating Cu sheets are provided with positioning holes, a magnetic flux pump is placed in the positioning holes, the superconducting magnet is excited through the magnetic flux pump, and current leads and welding resistors are not needed. The two faces of the insulating Cu sheets are coated with insulation varnish, the diameters of the insulating Cu sheets are same as those of the annular superconducting sheets, and radial notches are formed. The insulating Cu sheets are provided with connectors directly connected with a refrigerator, and a cold-guided cooling structure is adopted, so that the thermal stability is higher. The superconducting magnet has the advantages that the structure is simple, the stability is high, detachability is achieved, insulation treatment is easy, and the closed-loop operation of the superconducting magnet can be achieved.

Description

technical field [0001] The invention belongs to the application field of superconducting magnets, in particular to a cooling-conducting superconducting magnet based on annular superconducting sheets. Background technique [0002] Superconducting magnet technology is becoming more and more mature in commercial applications, and has been widely used in the medical field of MRI and strong magnetic fields. At present, the production speed of the second-generation high-temperature superconducting strip has reached 200m / h, and the length has reached the order of km. Superconducting magnets can be prepared by winding strips into a double pie or spiral structure. Large magnets require longer strip lengths. As the length increases, the yield of strips decreases greatly, which limits the high-temperature superconducting magnets. wide application. Superconducting strips of sufficient length can be realized by overlapping superconducting strips, but barrier-free welding cannot be real...

AI Technical Summary

Problems solved by technology

Superconducting magnets can be prepared by winding strips into double pie or spiral tube structures. Large magnets require longer strip lengths. As the length increases, the yield of strips decreases greatly, which limits the high-temperature superconducting magnets. wide application of

Superconducting strips of sufficient length can be achieved by overlapping superconducting strips, but barrier-free welding cannot be realized, and closed-loop operation of superconducting magnets cannot be realized.

[0003] Superconducting magnets are generally excited by a power supply at room temperature. The power supply is connected to the superconducting magnet through a current lead. The welding resistance between the lead wire and the superconducting wire will cause power loss when energized, and the heat generated will also increase the cooling cost, which is not conducive to Magnet Stability

In addition, after the excitation of the internal excitation method is completed, the flux pump coil needs to be taken out, and the coil needs to be put in again for the next excitation, which is cumbersome to operate

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