Mainz 2022 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 2: Radiofrequency Systems 1
AKBP 2.2: Vortrag
Montag, 28. März 2022, 14:15–14:30, AKBP-H14
Commissioning of a new B-Mapping System for SRF Cavity Performance Tests — •Jonas C. Wolff1,2, Wolfgang C. A. Hillert1,2, Andre Gössel1, Detlef Reschke1, Lea Steder1, and Lennart Trelle1 — 1Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg — 2Universität Hamburg - Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg
Magnetic flux trapped in the Niobium bulk material of superconducting radio frequency (SRF) cavities degrades their quality factor and the accelerating gradient. The sensitivity for flux trapping is mainly determined by the treatment and the geometry of the cavity as well as the Niobium grain size and orientation. To potentially improve the flux expulsion characteristics of SRF cavities 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 1.3 GHz TESLA-Type single-cell SRF cavities has been developed and is currently in the commissioning phase at DESY. Contrary to similar approaches, 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 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, required signal processing circuitry for the calibration as well as first performance test results of the B-mapping system are presented in detail.