Author: Schmidl, F.
Paper Title Page
MOPP008 First Measurements of a New Type of Coreless Cryogenic Current Comparators (4C) for Non-Destructive Intensity Diagnostics of Charged Particles 81
  • V. Tympel, T. Stöhlker
    HIJ, Jena, Germany
  • S. Anders, J. Kunert, M. Schmelz, R. Stolz, V. Zakosarenko
    IPHT, Jena, Germany
  • H. De Gersem, N. Marsic, W.F.O. Müller
    TEMF, TU Darmstadt, Darmstadt, Germany
  • J. Golm, F. Schmidl, T. Schönau, P. Seidel, M. Stapelfeld
    FSU Jena, Jena, Germany
  • D.M. Haider, M. Schwickert, T. Sieber, T. Stöhlker
    GSI, Darmstadt, Germany
  • T. Stöhlker
    IOQ, Jena, Germany
  • J. Tan
    CERN, Geneva, Switzerland
  • V. Zakosarenko
    Supracon AG, Jena, Germany
  Funding: Supported by the BMBF, project numbers 05P15SJRBA, 05P18RDRB1 and 05P18SJRB1.
The non-destructive and highly sensitive measurement of a charged particle beam is of utmost importance for modern particle accelerator facilities. A Cryogenic Current Comparator (CCC) can be used to measure beam currents in the nA-range. Therein, charged particles passing through a superconducting toroid induce screening currents at the surface of the toroid, which are measured via SQUIDs. Classical CCC beam monitors make use of a high magnetic permeability core as a flux-concentrator for the pickup coil. The core increases the pickup inductance and thus coupling to the beam, but unfortunately also raises low-frequency noise and thermal drift. In the new concept from the Leibniz Institute of Photonic Technology the Coreless Cryogenic Current Comparator (4C) completely omits this core and instead uses highly sensitive SQUIDs featuring sub-micron cross-type Josephson tunnel junctions. Combined with a new shielding geometry a compact and comparably lightweight design has been developed, which exhibits a current sensitivity of about 6 pA/sqrt(Hz) in the white noise region and a measured shielding factor of about 134 dB*.
* V. Zakosarenko et al., Coreless SQUID-based cryogenic current comparator for non-destructive intensity diagnostics of charged particle beams, Supercond. Sci. Technol. 32 (2019) 014002.
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About • paper received ※ 04 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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