Abstract
Construction of a second target station of the Materials and Life Science Experimental Facility is one of the future plans of the Japan Proton Accelerator Research Complex. A superconducting magnet called a pion capture solenoid, which requires 100 MGy class high radiation resistance, will be installed for the muon beamline in the second target station. Therefore, we are researching and developing radiation-resistant magnets based on high temperature superconductors. As one of the research subjects, we have been investigating the effect of irradiation on rare-earth barium copper oxide (REBCO) conductors. Results of irradiation using the <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">60</sup> Co gamma-ray facility indicated no significant degradation in superconductivity up to 27.4 MGy. However, decreases in the superconducting transition temperature and critical current were confirmed with a neutron irradiation fluence of 8.23 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">21</sup> n/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> .
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