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Status of the 25 T, 100 mm Bore HTS Solenoid for an Axion Dark Matter Search Experiment
Gupta, Ramesh,Anerella, Michael,Cozzolino, John,Joshi, Piyush,Joshi, Shresht,Plate, Stephen,Sampson, William,Song, Honghai,Wanderer, Peter,Chung, Woohyun,Kim, Jingeun,Ko, Byeong Rok,Youn, Sung Woo,Sem Institute of Electrical and Electronics Engineers 2019 IEEE transactions on applied superconductivity Vol.29 No.5
<P>This paper presents the design and test results of the pancake coils for the 25 T, 100 mm bore solenoid that Brookhaven National Laboratory (BNL) is building for the Institute for Basic Science (IBS) in Korea for an Axion dark matter search. The design is based on second-generation (2G) high-temperature superconducting (HTS) tape with no-insulation winding. The major challenges in the high-field, large aperture solenoid are the large stresses and the quench protection. Moreover, the design should be robust for reliable operation in a user facility environment. The paper will also present the construction and test results of two ∼100 mm bore double pancake coils creating a peak field of up to ∼17 T and similar hoop stresses as will be in the 25 T solenoid. The coils were subject to several severe tests, including the simulations of large defects and extended quench studies at ∼4 K. The most striking part of these studies was the demonstration of how fast (a few hundred milliseconds) these coils can turn from the superconducting state to the normal state (quench or thermal runaway). This removes the past concerns of protecting high-field HTS coils because of the low quench propagation velocities.</P>
High-Field Solenoid Development for Axion Dark Matter Search at CAPP/IBS
Gupta, R.,Anerella, M.,Ghosh, A.,Sampson, W.,Schmalzle, J.,Konikowska, D.,Semertzidis, Y. K.,Shin, Y. Institute of Electrical and Electronics Engineers 2016 IEEE transactions on applied superconductivity Vol.26 No.4
<P>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 similar to 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.</P>