Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 33, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6668/ab9ef3
Keywords
high temperature superconductor; ReBCO; CORC (R); CICC; quench; Hall sensor; tokamak
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Funding
- Office of Science, High Energy Physics, U.S. Department of Energy [DE-AC02-05CH11231, DE-SC0014009, DE-SC0019934]
- U.S. Department of Energy (DOE) [DE-SC0019934] Funding Source: U.S. Department of Energy (DOE)
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ReBCO superconducting cables have the potential to enable compact thermonuclear fusion reactors that operate at magnetic fields exceeding 20 T and allow operation at temperatures far exceeding the boiling point of liquid helium, potentially allowing for demountable magnets. Normal zone detection remains a challenge, and while novel quench detection techniques are an active area of research, few are non-invasive, provide real-time quench detection, and have been demonstrated with current ramp rates relevant for fusion reactors. To address this problem, a CORC (R) cable termination is developed with integrated Hall sensors to monitor current redistribution as a proxy for quench detection. The methodology exploits the current sharing and layered topology in CORC (R) cables, and allows quench detection using a localized sensor instead of co-wound voltage wires or optical fibers. Experiments are presented where current redistribution is measured from induced quenches, and in a 0.2 meter CORC (R) sample it is found that the Hall sensors detect normal zone transitions with a similar magnitude and temporal resolution as voltage measurements. To emulate the conditions of dynamic poloidal and central solenoidal fields, experiments are repeated with ramp rates up to 10 kA s(-1) that demonstrate the potential to detect normal zone development over a range of experimental parameters.
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