Wuppertal 2015 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 6: SC Resonators
AKBP 6.7: Vortrag
Dienstag, 10. März 2015, 15:15–15:30, BZ.08.06 (HS 1)
Second sound quench localization system for 1.3 GHz Nb cavities — •Ricarda Laasch1,2, Yegor Tamashevich1,2, Aliaksandr Navitski2, Eckhard Elsen2, and Brian Foster1,2 — 1University of Hamburg, 20146 Hamburg, Germany — 2DESY, 22607 Hamburg, Germany
Precise localization and understanding of local thermal breakdowns or 'quenches' in 9-cell 1.3 GHz superconducting RF cavities are important steps in improving the performance of cavities, such as for the production of cavities for the European XFEL or the planned International Linear Collider. The 2nd sound method is a threshold technique that utilizes the phase transition of superfluid Helium induced during a quench and detected in Oscillating Superleak Transducers (OST). With several OSTs employed typical resolutions of ~1cm and better have been obtained. The number and position of sensors has to be optimized. The results are compared with a resistor-based temperature mapping system. Identified quench locations can be inspected for defects using the optical inspection system (OBACHT). Test results of several cavities will be shown.