Description
Conventional superconducting magnets for HEP research are made of low Tc superconductors (LTSs) such as multifilament Nb-Ti composite wires. High Tc superconductors (HTSs) such as REBCO coated conductors have been attracting broad interest for applications to magnets for HEP research, because they can generate high magnetic fields that cannot be generated by using LTSs, and they are much more tolerant of high heat load such as radiation heat load due to their high critical temperatures.
However, the wide flat-tape shape of REBCO coated conductors leads to their following shortcomings: limited current carrying capacity, because it is difficult to assemble tapes into cable, unlike LTS round wires; limited bendability (flat-wise bending, limited torsion), which restricts coil shapes; large magnetization and the hysteresis of magnetization: the both affecting field quality and the latter generating large magnetization loss. The Spiral Copper-plated Striated Coated-conductor cable (SCSC cable) is our novel concept of cable, in which copper-plated multifilament coated conductors are wound spirally on a core in multiple layers. It can carry much more current than a single coated conductor, it is bendable in any direction, and its magnetization is small due to its narrow filaments. Kyoto University has been developing SCSC cables supported by JST and has been collaborating with KEK and LBL toward its applications to magnets for HEP research supported by the Japan-US cooperation program for HEP.
In this presentation, we will present the concept and the current status of R&D of SCSC cable as well as future outlook toward its applications to magnets for HEP research.
This work was supported in part by JST-ALCA-Next Program Grant Number JPMJAN24G1 and in part by JSPS KAKENHI Grant Number JP24H00316, Japan.