Detectors Sensing Second Events Induced by Thermal Quenches of SRF Cavities in He II
| Autor: | Fouaidy, Mohammed, Dubois, Francis, Longuevergne, David, Pochon, Olivier, Yaniche, Jean-François |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: | |
| DOI: | 10.18429/jacow-srf2015-mopb023 |
| Popis: | SRF bulk Nb cavities are often limited by quench due to anomalous losses (heating due normal defects or Field Emission). We continued R&D on Quench Detectors (QD) activity for locating quench in SRF cavities via 2nd sound in superfluid helium. We investigated 2 kinds of QD: Capacitive OST (COST) and Low Response time resistive Thermometers (LRT). A test stand operating in LHe (Temperature: T0) was used for the characterization of the QD by means of precise experimental simulation of SRF cavity quench (pulsed heat flux qP). For improving spatial resolution of QD, smaller COSTs were developed and tested. We investigated the dynamic response of QD as function of different parameters (heater size/geometry, T0, qP) and data are reported. Further, a 2nd Sound Resonator (SSR), with a pair of COSTs at its 2 extremities as 2nd Sound Generator (SSG) and Detector (SSD) respectively and housing also a low heat capacity heater (SSG) and a LRT (SSD) assembly was developed. The first experimental data obtained, with SSR operated in resonating mode or in a shock wave mode are presented. The results concerning locating of quenches in QWR and spoke cavities are discussed. Proceedings of the 17th International Conference on RF Superconductivity, SRF2015, Whistler, BC, Canada |
| Databáze: | OpenAIRE |
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