A high field and cryogenic test facility for neutron irradiated superconducting wire

[摘要] A 15.5 T superconducting magnet and a variable temperature insert (VTI) system were installed at a radiation control area in Oarai center in Tohoku University to investigate the superconducting properties of activated superconducting materials by fast neutron. The superconductivity was measured at cryogenic temperature and high magnetic field. During these tests, some inconvenient problems were observed and the additional investigation was carried out. The variable temperature insert was designed and assembled to perform the superconducting property tests. without the liquid helium. To remove the heat induced by radiation and joule heating, high purity aluminum rod was used in VTI. The thermal contact was checked by FEM analysis and an additional support was added to confirm the decreasing the stress concentration and the good thermal contact. After the work for improvement, it was affirmed that the test system works well and all troubles were resolved. In this report, the improved technical solution is described and the first data set on the irradiation effect on Nb3Sn wire is presented.

[发布机构] National Institute for Fusion Science, Toki, Gifu, 509-5292, Japan^1;Japan Superconductor Technology, Inc., Kobe, Hyogo; 651-2271, Japan^2;Japan Proton Accelerator Research Complex, Ibaraki, Tokai, 319-1195, Japan^3;High Energy Accelerator Research Organization, Ibaraki, Tsukuba, 305-0801, Japan^4;Tohoku University, Oarai, Ibaraki; 311-1313, Japan^5

[关键词] Cryogenic temperatures;Cryogenic test facility;High magnetic fields;High purity aluminum;Irradiation effect;Superconducting properties;Technical solutions;Variable temperature inserts