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TT: Fachverband Tiefe Temperaturen
TT 18: Superconductivity: Poster
TT 18.57: Poster
Monday, March 18, 2024, 15:00–18:00, Poster C
Axial Cryogenic current comparator (CCC) for FAIR — •Lorenzo Crescimbeni1,2, David Haider2, Thomas Sieber2, Frank Schmidl1, Thomas Stöhlker1,2,4, Ronny Stolz3, Volker Tympel4,2, and Vvyacheslav Zakosarenko3,5 — 1Friedrich-Schiller-University Jena, Germany — 2GSI Helmholtz Centre for Heavy Ion Research, Darmstadt, Germany — 3Leibniz Institute of Photonic Technology (Leibniz IPHT), Jena, Germany — 4Helmholtz-Institute Jena, Germany — 5Supracon AG, Jena, Germany
The Cryogenic Current Comparator (CCC) is a superconducting device based on an ultrasensitive SQUID magnetometer (fT range). Measuring the beam's azimuthal magnetic field, it provides a calibrated non-destructive measurement of beam current with a resolution of 10 nA or better, independent from ion species and without tedious calibrations procedure. The non-interceptive absolute intensity measurement of weak ion beams (<1 muA) is essential in heavy ion storage rings and in transfer lines at FAIR. With standard diagnostics, this measurement is challenging for bunched beams and virtually impossible for coasting beams.
To improve the performance of the detector a new type of CCC using an alternative magnetic shield geometry has been developed. The so-called "axial" geometry will allow for much higher magnetic shielding factor, an increased pick-up area, and an expected lower noise component at low frequencies. Hereby the construction process and the results of test will be discussed, together with further improvements of the detector aimed to provide the best possible CCC version to FAIR.
Keywords: SQUID; Cryogenic; Current; CCC; Accelerator physics