Dortmund 2021 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
AKBP: Arbeitskreis Beschleunigerphysik
AKBP 5: Radiofrequency and Miscellaneous
AKBP 5.3: Vortrag
Dienstag, 16. März 2021, 17:00–17:15, AKBPb
Calibration Device for Second Sound Quench Detection — •Lukas Ebeling1,2, Wolfgang Hillert2, and Lea Steder1 — 1DESY, Hamburg, Germany — 2Universität Hamburg, Germany
An important part of superconducting radio frequency cavity R&D is quench detection since the breakdown of the superconductivity limits the cavity performance. Although a detection based on second sound waves propagating in liquid helium is widely used, estimating its accuracy is difficult and only few studies dealing with systematic uncertainties exist. Particularly helpful for this task is the artificial generation of second sound signals using a calibration device. Therefore, the already existing second sound system at the cavity test facility of DESY is extended by calibration device prototypes.
This talk will show that ohmic resistors can play a crucial role in the construction of such a tool. Heated by means of short electrical pulses, these resistors generate a second sound wave, which can be detected even within larger cryostats using noise cancelling algorithms and the existing reconstruction software. With a calibration device at hand, the influences of sensor positioning and quench location are investigated. This presentation will also address the observed offset in second sound propagation time caused by the resistor's inertia.