QUENCH DETECTION IN SUPERCONDUCTORS
This invention is on a new fast quench detection method for superconducting devices utilizing the architecture of RE-Ba-Cu-O (REBCO, RE=rare-earth) superconductor tape itself. Quench refers to the transition of superconductors from a superconducting state to a resistive normal state. At the remarkably high current densities (>100 times that of copper), REBCO tapes are susceptible to localized heating at defective spots that are invariably present. Since the normal zone propagation velocity in REBCO is
extremely small, the hot spots cannot be detected in time to prevent thermal runaway, leading to a catastrophic failure. While several methods are being developed for quench detection, they suffer from drawbacks such as susceptibility to vibrations, low signal-to-noise ratio, extrinsic sensors co-wound with the tape that increase the complexity of coil fabrication or reduce the overall current density. So, there is an imminent need for a method for rapid quench detection without these drawbacks. Our novel solution
is to utilize the REBCO tape architecture itself as the main component for quench detection. Our method will be able to meet the requirements for a quench detection system namely, fast response time and strong signal intensity without the drawbacks of other methods.