Speaker
Description
The high intensity muon beam line is required for the next-generation experimental search for the muon-to-electron conversion, such as PRISM project and the muon collider for the NuFact project. Currently, a muon beam line for COMET experiment is under construction, and the pion capture solenoid system faces the radiation issue. Radiation exposure (neutron fluence: 5$\times$10$^{21}$ n/m$^2$/200 days and 3 MGy/200 days) for the COMET pion capture solenoid causes the degradation of the coil cooling capacity by the conduction cooling method and mechanical property of magnet materials. A Mineral insulated magnet with High Temperature Superconductor (HTS) is one of the candidate to solve the radiation issue for the pion capture solenoid. Due to the tritium production from the nuclear reaction, the conduction cooling is best option for designing the superconducting coil at high radiation environment. Therefore, we are aiming to study and develop the HTS magnet with mineral insulation and conduction cooling. To confirm the deterioration of the critical electric current (I$_c$) of HTS by the irradiation, commercial REBCO coated conductors are studied with the neutron fluence up to 10$^{22}$ n/m$^2$ using the joint research program of the International Research Center for Nuclear Materials Science of the Institute for Materials Research (IMR), Tohoku University. The I$_c$ of the irradiated HTS tape is measured with 15.5 Tesla external magnetic field at IMR. Trial surface treatment with ceramics to commercial REBCO coated conductors and magnet materials is currently in progress. In this contribution, the results of the irradiation test of HTS and development status of the mineral insulated HTS magnet will be presented.
| Submitters Country | Japan |
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