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First Measurements of a New Type of Coreless Cryogenic Current Comparators (4C) for Non-Destructive Intensity Diagnostics of Charged Particles

Authors :
Tympel, Volker
Anders, Solveig
De Gersem, Herbert
Golm, Jessica
Haider, David
Kunert, Juergen
Marsic, Nicolas
Müller, Wolfgang
Schmelz, Matthias
Schmidl, Frank
Schwickert, Marcus
Schönau, Thomas
Seidel, Paul
Sieber, Thomas
Stapelfeld, Max
Stöhlker, Thomas
Stolz, Ronny
Tan, Jocelyn
Zakosarenko, Vyacheslav
Publisher :
JACoW Publishing, Geneva, Switzerland

Abstract

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*.<br />Proceedings of the 8th International Beam Instrumentation Conference, IBIC2019, Malmö, Sweden

Details

Language :
English
Database :
OpenAIRE
Accession number :
edsair.doi...........29f4fb0180d32a4a8abfcfe7f037b1a8