August 27, 2017 to September 1, 2017
RAI Congress Center, Amsterdam, The Netherlands
Europe/Amsterdam timezone

A REBCO Persistent-Current Switch, Immersed in Solid Nitrogen, Operating In the Temperature Range 10-30 K

Aug 31, 2017, 8:45 AM
G102-103 Room

G102-103 Room

Regular 15 minutes Oral Presentation H3 - Other Associated Technologies Thu-Mo-Or29


Philip Michael (MIT Francis Bitter Magnet Laboratory)


We present design and test results for a thermally-activated persistent-current switch (PCS) applied to a double pancake wound (DP) coil (151-mm ID, 172-mm OD), wound, using the no-insulation (NI) technique with a 120-m long, 76 micron thick, 6-mm wide REBCO tape. For the experiments reported in this paper, the NI DP assembly was immersed in a volume of solid nitrogen (SN2), cooled to temperatures in the range from 10 K to 30 K by conduction to a two-stage coldhead, and energized at up to 600 A. The DP assembly operated in quasi-persistent mode, with the conductor tails soldered together to form a close-out joint with resistance below 15 nOhm. The measurements confirm PCS activation at heating powers below our ~1 W design value, and a field decay time constant in excess of 300 h, limited by the finite resistance of our DP close-out joint.
Acknowledgement: This work was supported by the National Institute of Biomedical Imaging and Bioengineering of the National Institutes of Health.

Submitters Country USA

Primary authors

Philip Michael (MIT Francis Bitter Magnet Laboratory) Jiho Lee (MIT Francis Bitter Magnet Laboratory) John Voccio (Wentworth Institute of Technology) Juan Bascuñán (MIT Francis Bitter Magnet Laboratory) Prof. Seungyong Hahn (Electrical and Computer Engineering, Seoul National University, Seoul, Korea) Yukikazu IWASA (MIT Francis Bitter Magnet Laboratory)

Presentation materials