期刊
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
卷 32, 期 6, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2022.3169996
关键词
Field gradient; harmonic coefficients; local voltages; MRI; NI HTS coil; NMR; real-time monitoring
资金
- Korea Medical Device Development Fund - Korea government (the Ministry of Science and ICT) [1711138068, KMDF_PR_20200901_0063]
- Korea Medical Device Development Fund - Korea government (Ministry of Trade, Industry and Energy) [1711138068, KMDF_PR_20200901_0063]
- Korea Medical Device Development Fund - Korea government (Ministry of Health and Welfare) [1711138068, KMDF_PR_20200901_0063]
- Korea Medical Device Development Fund - Korea government (Ministry of Food andDrug Safety) [1711138068, KMDF_PR_20200901_0063]
This paper presents a system for real-time monitoring spatial and temporal electromagnetic behaviors of a high temperature superconductor (HTS) coil. The system consists of Hall sensors and voltage taps to measure spatial and temporal magnetic fields, and local voltages. The feasibility of the system is validated through simulations and experimental comparisons.
This paper presents a system for real-time monitoring spatial and temporal electromagnetic behaviors of a high temperature superconductor (HTS) coil with the no-insulation (NI) winding technique. We implemented a real-time monitoring system that consists of Hall sensors and voltage taps to measure spatial and temporal magnetic fields, and local voltages. An NI HTS test coil was wound, and the real-time monitoring system was combined with the test coil. An experimental study was performed in a liquid nitrogen bath at 77 K, where the test coil was charged with a constant ramp rate of 0.05 As-1 up to its operating current of 100 A. To describe measurement results, including local voltages and magnetic fields, we propose a set of simulations for coil voltages and currents, current density including screening current, and field gradient including screening current induced field. Using this set, we successfully simulated spatial and temporal electromagnetic behaviors generated by the test coil to a reasonable extent. The discussion section will provide comparison results between calculations and measurements.
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