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TY - CONF AU - Haider, D.M. AU - De Gersem, H. AU - Marsic, N. AU - Müller, W.F.O. AU - Reiter, A. AU - Schmelz, M. AU - Schwickert, M. AU - Sieber, T. AU - Stapelfeld, M. AU - Stolz, R. AU - Stöhlker, T. AU - Tympel, V. AU - Ucar, F. AU - Zakosarenko, V. ED - Kim, Changbum ED - Schaa, Volker R. W. ED - Kim, Dong-Eon ED - Lee, Jaeyu TI - Commissioning of the Cryogenic Current Comparator (CCC) at CRYRING J2 - Proc. of IBIC2021, Pohang, Rep. of Korea, 24-28 May 2021 CY - Pohang, Rep. of Korea T2 - International Beam Instrumentation Conference T3 - 10 LA - english AB - Accurate non-destructive measurement of the absolute intensity of weak ion beams (< 1 uA) in storage rings is often restricted to special beam conditions and, even then, is associated with large uncertainties and tedious calibration procedures. However, experiments with rare ions in particular depend on excellent current resolution. In order to make these beams accessible, the Cryogenic Current Comparator (CCC) monitors deviations of the DC beam current on a scale of nA and compares the signal to a calibrated reference current. At the heavy-ion storage ring CRYRING at GSI a CCC prototype for FAIR was installed and first results of the commissioning are reported here. Preceding the operation with beam, a careful design of the beamline helium cryostat was required to provide the stable cryogenic environment needed for CCC operation. Mechanical and electro-magnetic perturbations that interfere with measurement of the beam’s faint magnetic field are suppressed by the internal structure of the system and a superconducting magnetic shield, while the remaining interference can be filtered with adequate signal processing. In this way, a current resolution in the nA range was demonstrated. PB - JACoW Publishing CP - Geneva, Switzerland SP - 349 EP - 352 KW - dipole KW - cryogenics KW - detector KW - MMI KW - storage-ring DA - 2021/10 PY - 2021 SN - 2673-5350 SN - 978-3-95450-230-1 DO - doi:10.18429/JACoW-IBIC2021-WEOB02 UR - https://jacow.org/ibic2021/papers/weob02.pdf ER -