600mm320mmcI00 ]A[P2-13n B0~5 T at f120 mmn Bends ~0n Conduction cooledn Top ≥20 K applicable82l Bi-2223 conduction cooled magnet with bucking coils l Rated field (Bcenter = 4.8 T @300 A) achieved at l Design validated. l Magnetic refrigeration experimentl REBCO Magnet developmentl Some improvements neededdesigned and fabricated. f120 mm bore at 20 K operation. Cooldown took 80 hrsMagnet performance agreed with the prediction Field distribution agreed w/ designLong time (~6 hrs) stable magnetic field generation at 20 K confirmedNishijima and Kamiya, IEEE TAS 34 (2024) 4602905Nishijima et al, IEEE TAS 33 (2023) 46026054-K GM cryocoolerRT bore (f90 mm)f700 mmTest resultsFuture Planf700 mmKey Words: High-temperature superconducting magnet, Bi-2223Theme underDiscussionMagnet designMagnet photosConclusionTo promote the spread of magnetic refrigeration systems for hydrogen liquefaction, it is desirable that the superconducting magnet implemented in the system operate at temperatures above the liquefaction temperature of hydrogen. We have developed a Bi-2223 HTS magnet and tested it at 20 K and higher temperatures. This Bi-2223 magnet is thermally very stable because it was conservatively designed. This means that the current density of the magnet was not sufficiently high, and the magnet was not very compact. To achieve more compact HTS magnet, we need to develop a magnet using REBCO.Superconducting System Group, GREEN Gen NishijimaE-mail：： nishijima.gen@nims.go.jpIntroduction600500400300200100 Conductor Ic I at Vall ~ 30 mV20406080T [K]Development of High Temperature Superconducting Magnet for Magnetic Refrigeration
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