PAC09 - List of Authors (Seidel, P.)

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Seidel, P.

Paper	Title	Page
TH5RFP046	An LTS SQUID-Based High Precision Measurement Tool for Nuclear Physics	3555
	W. Vodel, R. Geithner, R. Neubert, P. Seidel FSU Jena, Jena A. Peters HIT, Heidelberg M. Schwickert GSI, Darmstadt
	Funding: This work was supported in part by the Gesellschaft für Schwerionenforschung Darmstadt, Germany. We describe an LTS SQUID-based high precision measurement tool for nuclear physics. This device makes use of the Cryogenic Current Comparator (CCC) principle and is able to measure e.g. the absolute intensity of a high energy ion beam extracted from a particle accelerator or the so-called dark current, generated by superconductive RF accelerator cavities at high voltage gradients. The CCC mainly consists of a high performance LTS-DC SQUID system, a special toroidal pick-up coil, and a meander-shaped superconductive magnetic ring structure. The design of the CCC requires a thorough knowledge of several noise contributions to achieve a high current resolution. As the SQUID and the pick-up coil are extremely sensitive to external magnetic fields it is necessary to shield both sufficiently against any disturbing field sources. Theoretical investigations showed that with strong attenuation of external noise sources an improvement of the sensor performance is dependent on the ferromagnetic core material imbedded in the pick-up coil. Several materials were investigated and the temperature- and the frequency dependence measured. The current results will be presented and discussed.

Paper

Title

Page

TH5RFP046

An LTS SQUID-Based High Precision Measurement Tool for Nuclear Physics

3555

W. Vodel, R. Geithner, R. Neubert, P. Seidel
FSU Jena, Jena
A. Peters
HIT, Heidelberg
M. Schwickert
GSI, Darmstadt

Funding: This work was supported in part by the Gesellschaft für Schwerionenforschung Darmstadt, Germany.

We describe an LTS SQUID-based high precision measurement tool for nuclear physics. This device makes use of the Cryogenic Current Comparator (CCC) principle and is able to measure e.g. the absolute intensity of a high energy ion beam extracted from a particle accelerator or the so-called dark current, generated by superconductive RF accelerator cavities at high voltage gradients. The CCC mainly consists of a high performance LTS-DC SQUID system, a special toroidal pick-up coil, and a meander-shaped superconductive magnetic ring structure. The design of the CCC requires a thorough knowledge of several noise contributions to achieve a high current resolution. As the SQUID and the pick-up coil are extremely sensitive to external magnetic fields it is necessary to shield both sufficiently against any disturbing field sources. Theoretical investigations showed that with strong attenuation of external noise sources an improvement of the sensor performance is dependent on the ferromagnetic core material imbedded in the pick-up coil. Several materials were investigated and the temperature- and the frequency dependence measured. The current results will be presented and discussed.