22-27 September 2019
Hyatt Regency Hotel Vancouver
Canada/Pacific timezone

Tue-Af-Po2.14-08 [8]: Study of Screening Currents in No-Insulation REBCO Magnets

24 Sep 2019, 14:00
2h
Level 2 Posters 1

Level 2 Posters 1

Speaker

Kwanglok Kim (National High Magnetic Field Laboratory)

Description

Recently, we have reported that screening currents in REBCO high field magnets may be a source of large electromagnetic stresses and consequently cause mechanical damage to the superconducting tape. To better estimate the electromechanical behavior of a REBCO magnet even in the initial design stage, we have modeled the distribution of screening currents in an NI REBCO magnet and compared the simulations with experiments to visualize the spatial distribution and temporal change of the screening currents within a REBCO sample tape. A 14 T, 161-mm low temperature superconductor background-field magnet, currently available at the Applied Superconductivity Center of the National High Magnetic Field Laboratory, is used to apply the magnetic field to induce screening currents in REBCO tapes. An array of calibrated Hall sensors is used to measure the time-varying magnetic fields on the REBCO tape’s surface. All tests are performed in a bath of liquid helium at 4.2 K.

Acknowledgement
This work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1644779 and DMR-1839796, and the State of Florida. A part of the analysis work by J. Bang and S. Hahn was supported by the National Research Foundation of Korea as a part of Mid-Career Research Program (No. 2018R1A2B3009249).

Primary author

Kwanglok Kim (National High Magnetic Field Laboratory)

Co-authors

Thomas Painter (National High Magnetic Field Laboratory) Kwangmin Kim (National High Magnetic Field Laboratory) Mr Xinbo Hu (National High Magnetic Field Laboratory) Kabindra Bhattarai (National High Magnetic Field Laboratory) Jeseok Bang (Seoul National University) So Noguchi (Hokkaido University) Iain Dixon (National High Magnetic Field Laboratory) David Larbalestier (National High Magnetic Field Laboratory) Seungyong Hahn (Seoul National University)

Presentation Materials