High-Field Solenoid Development for Axion Dark Matter Search at CAPP/IBS

Construction and test results of a 100-mm-bore solenoid made with the high-temperature superconductor (HTS) producing a peak field of over 10 T are presented. This is the first step toward building a very high field solenoid (35–40 T)—one of the key components of the proposed state-of-the-art facility for dark matter search at the Center for Axion and Precision Physics Research, Institute for Basic Science in Korea. The coils made with HTS are expected to provide a field of ∼25 T, and the coils made with low-temperature superconductors are expected to provide a field of 10–15 T. REBCO HTS tapes were provided by SuNAM along with the measurements at 20 K in 3.5- to 4-T applied field. The Brookhaven National Laboratory measured several samples at 4 K in the applied field of 4–8 T. This paper will present a series of test results of the conductor, six pancake coils, and the fully assembled solenoid.