This paper presents results of quench localization on 3.9 GHz XFEL prototype cavities tested at LASA vertical test facility. Cavities have been equipped with OST second sound detectors and thermometry sensors. A first guess for quench position has been obtained from modal analysis. Second sound sensors confirmed the quench position resolving also the symmetry degeneracy given by the RF mode pattern analysis. In a subsequent vertical test, second sound and temperature sensors have been installed nearby the suspect quench position. From Thermometry mapping, a sudden increase in cavity temperature within a small region is evident, therefore confirming that a local thermal breakdown due to defect heating occurs in the predicted quench point. The quench region deduced with the mentioned techniques is eventually compared with results of optical inspection.
|Titolo:||Quench detection diagnostics on 3.9 GHz XFEL cavities|
PAGANI, CARLO (Ultimo)
|Parole Chiave:||quench localization ; modal analysis ; second sound sensors ; superconducting RF ; particle accelerators ; superconducting linacs ; superconducting linear accelerators|
|Settore Scientifico Disciplinare:||Settore FIS/01 - Fisica Sperimentale|
|Data di pubblicazione:||feb-2014|
|Tipologia:||Book Part (author)|
|Appare nelle tipologie:||03 - Contributo in volume|