Connector between high-temperature superconductive magnet double-cake coils and its welding method

Abstract

This is a tie-in of double pie loop for high temperature super conducting magnet and its jointing method. The tie-in composes a concave base, NbTi bridge and a convex cover. The concave base is the matrix of the tie-in and made by metal like copper of low resistivity, of a shape in arc and radial section in rectangle and is fixed to a magnet. The NbTi bridge is embedded in the groves[C1, C2] on the base, and the convex beam on the convex cover is also embedded in the groves to fix the NbTi bridge.

Description

technical field [0001] The invention relates to a joint between double cake coils in a high temperature superconducting magnet and a welding method thereof, in particular to a joint between double cake coils of a high temperature superconducting magnet working in a liquid helium temperature zone and a welding method thereof. Background technique [0002] High-temperature superconducting magnets have the advantages of high stability, high current density and high critical magnetic field that cannot be achieved by low-temperature superconductors in the liquid helium temperature region. They have broad prospects in applications such as nuclear magnetic resonance imaging, strong magnetic fields, and energy storage. [0003] Conductors that can be used to wind high-temperature superconducting magnets include bismuth-based silver-coated strips (Bi-2223 / Ag) that have been commercially produced and YBCO-coated high-temperature superconducting strips that are currently being developed...

AI Technical Summary

Problems solved by technology

The overlapping method is to weld the taps of the superconducting tapes of two adjacent double-cake coils together with solder along the winding direction; this method has a simple structure, but there is a certain axial gap between the two double-cake coils. Span, the two overlapping taps are easy to sprain; directly soldering with a soldering iron, the temperature cannot be controlled, and overheating will easily cause damage to the soldering point; the uniformity of the solder layer is difficult to control, and it is easy to weld; the above factors cause the joint resistance to be too large

The transition metal method is to solder the superconducting tape taps of two adjacent double-cake coils on a low-resistivity metal sheet such as pure copper or silver, and weld the two adjacent double-cake coils together through a low-resistivity metal sheet; Compared with the lap joint method, it can avoid the influence of the axial span of two adjacent double pie coils on the lap tap, but it is also difficult to control the temperature by direct welding with a soldering iron, and the thickness of the solder layer between the superconducting tape and the metal sheet has a large randomness. Sexuality, and it is easy to solder, resulting in a large difference in the resistance of the joints

Images