Dortmund 2021 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 5: Radiofrequency and Miscellaneous
AKBP 5.6: Talk
Tuesday, March 16, 2021, 17:45–18:00, AKBPb
Development of a new B-Mapping System for SRF Cavity Vertical Tests — •Jonas Christian Wolff1,2, Wolfgang Hillert1,2, Detlef Reschke1, and Lea Steder1 — 1Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg — 2Universität Hamburg - Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg
Magnetic flux trapped in the bulk material (Niobium) of superconducting radio frequency (SRF) cavities degrades their quality factor and the accelerating gradient. Here, the sensitivity of the surface resistance to trapped magnetic flux is mainly determined by the cavity geometry and the Niobium grain size. To potentially improve the flux expulsion characteristics and hence the efficiency of future accelerator facilities further studies of the trapping behavior are essential. For this purpose a so-called "B-Mapping System" to monitor the magnetic flux along the outer cavity surface of SRF 1.3 GHz TESLA-Type single-cell cavities is currently under development at DESY. Contrary to former approaches e.g. at Helmholtz-Zentrum Berlin (HZB), this system digitizes the sensor signals already inside of the cryostat to extensively reduce the number of required cable feedthroughs. Furthermore, the signal-to-noise ratio (SNR) and consequently the measuring sensitivity can be enhanced by shorter analog signal lines, less thermal noise and the Mu-metal shielding of the cryostat. In this contribution the design, the development process as well as first performance test results of the system are presented.