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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 12: AKBP Poster Session
AKBP 12.1: Poster
Thursday, March 21, 2024, 11:00–14:00, Poster A
Design of Dual-Core Cryogenic Current Comparators for Beamlines — •Volker Tympel1,2, Frank Machalett1,2,3, Thomas Stöhlker1,2,3, Lorenzo Crescimbeni2,3, David Haider2, Thomas Sieber2, Marcus Schwickert2, Frank Schmidl3, Paul Seidel3, Matthias Schmelz4, Ronny Stolz4, and Vyacheslav Zakosarenko4,5 — 1Helmholtz Institut Jena, Jena — 2Fröbelstieg 3 — 3Friedrich-Schiller-University Jena — 4Leibniz Institute of Photonic Technology, Jena — 5Supracon AG, Jena
Bunched (AC) and un-bunched (DC) beam of charged particle leads to a magnetic field, like an electrical current in a wire. Cryogenic Current Comparators (CCC) for beamlines are able to measure that AC or DC beam current non-destructive, highly sensitive, and absolute in the nA range. Niobium based single core CCCs are running at CERN-Antiproton Decelerator (100 mm beamline diameter, BLD) and tested at GSI-CRYRING@ESR for the new Facility for Antiproton and Ion Research (FAIR) in Darmstadt with 150 mm BLD. In this work, smaller CCCs (BLD 63 mm) were created to investigate the limits of this measuring principle. For this purpose, dual-core CCCs (DCCCs) with total inductances of 200 uH or 300 uH @4.2 K were developed and measured. The fluctuation dissipation theorem (FDT) proved to be an effective tool for making a prediction about the expected current noise right at the beginning of the CCC creation. For the first time a white noise below 1 pArms/sqrt(Hz) could be achieved. Finely, it was possible to measure current impulses below 1 nApp in the laboratory. First results were presented at the EUCAS 2023 in Bologna.
Keywords: CCC; SQUID; FDT