CLASSE, Ithaca, New York
Cornell University, Ithaca, New York
Funding: DOE and NSF
Quench detection for 9-cell LLC cavities is presently a cumbersome procedure requiring two or more cold tests. One is to identify the cell-pair involved via quench field measurement in several pass band modes, followed by a second cold test with many fixed thermometers attached to the culprit cell-pair to identify the particular cell, and possibly a third measurement to zoom in on the quench spot with many localized fixed thermometers. We report here on a far more efficient alternative method which utilizes a few (e.g. 8) oscillating super-leak transducers to detect the He-II second sound wave driven by the defect induced quench. Results characterizing defect location on a 9-cell reentrant cavity with He-II second sound detection and corroborating measurements with carbon thermometers will be presented.
