4.4 Article

A Cryogen-Free 25-T REBCO Magnet With the Extreme-No-Insulation Winding Technique

Journal

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2022.3161401

Keywords

Windings; Magnetomechanical effects; Superconducting magnets; Prototypes; Copper; Stress; Conductors; Extreme-No-Insulation; high-field magnets; no-Insulation; nuclear magnetic resonance; REBCO magnets

Funding

  1. National Institute of General Medical Sciences of the National Institutes of Health [R21GM129688]

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This paper presents the operation result of a cryogen-free 23.5 T/phi 12.5 mm-cold-bore magnet prototype composed of a stack of 12 no-insulation REBCO single pancake coils. The coil design, including conductor performance, screening-current-induced field and stresses, and cryogenics, is validated through tests with a small prototype magnet.
We present the operation result of a cryogen-free 23.5 T/phi 12.5 mm-cold-bore magnet prototype composed of a stack of 12 no-insulation (NI) REBCO single pancake coils-ten middle coils of 6-mm wide and two end coils of 8-mm wide tape-forming 6 double pancake (DP) coils with inner joints. Each coil was wound with the tape having only 1-mu m-thick copper layer on each side to overcome the conductor thickness uniformity issue and enhance the mechanical strength within the winding, and then, additional electrical shunting by thin layers of solder was applied on the top and bottom surfaces of each DP coil for effective cooling and quench protection-called extreme-NI winding technique. With this small prototype magnet towards a benchtop 1-GHz NMR, we validate our coil design that include conductor performance, screening-current-induced field and stresses, and conduction-cooling cryogenics. Included in the paper are: 1) conductor issues and our counterproposal in winding; 2) screening-current reduction method; 3) design and manufacture summary of the magnet; and 4) operating test results of the magnet up to 25 Tesla.

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