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| MOPB013 |
Cryogenic Current Comparator for Storage Rings and Accelerators |
53 |
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- R. Geithner, T. Stöhlker
IOQ, Jena, Germany
- M.F. Fernandes
Cockcroft Institute, Warrington, Cheshire, United Kingdom
- M.F. Fernandes
CERN, Geneva, Switzerland
- M.F. Fernandes
The University of Liverpool, Liverpool, United Kingdom
- R. Geithner, T. Stöhlker
HIJ, Jena, Germany
- F. Kurian, H. Reeg, M. Schwickert, T. Sieber, T. Stöhlker
GSI, Darmstadt, Germany
- R. Neubert, P. Seidel
FSU Jena, Jena, Germany
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A Cryogenic Current Comparator (CCC) was developed for a non-destructive, highly sensitive monitoring of nA beams at the planned FAIR accelerator facility at GSI. The sensor part of the CCC was optimized for lowest possible noise-limited current resolution in combination with a high system bandwidth of about 200 kHz. It is foreseen to install the CCC inside the CRYRING, which will act as a well-suited test bench for further optimization of the CCC performance and the cryostat. In the meantime - until the completion of CRYRING - a CCC has been installed and will be tested in the antiproton storage ring (Antiproton Decelerator AD) at CERN. The pulse shape in the AD requires dedicated optimization of the sensor time response. The beam current will increase rapidly during injection from 0 to 12 μA. Since the slew rate of the overall system is limited by the CCC pickup coil, the input signal has to be low-pass filtered to not exceed the slew rate of the CCC system and to ensure a stable operation. For this purpose different low-pass configurations had been tested. In this contribution we present results of the CCC ¬sensor for AD, CRYRING and FAIR, respectively.
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Poster MOPB013 [2.095 MB]
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| MOPB043 |
A Cryogenic Current Comparator for the Low-Energy Antiproton Facilities at CERN |
143 |
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- M.F. Fernandes, J. Tan
CERN, Geneva, Switzerland
- M.F. Fernandes, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
- M.F. Fernandes, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
- R. Geithner, T. Stöhlker
IOQ, Jena, Germany
- R. Geithner, T. Stöhlker
HIJ, Jena, Germany
- R. Neubert
FSU Jena, Jena, Germany
- M. Schwickert, T. Stöhlker
GSI, Darmstadt, Germany
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Funding: Funded by the European Unions Seventh Framework Programme for research, technological development and demonstration under grant agreement no 289485.
Several laboratories have shown the potential of Cryogenic Current Comparators (CCC) for an absolute measurement of beam intensity down to the nA level. This type of current monitor relies on the use of Superconducting QUantum Interference Device (SQUID) magnetometers and superconductor magnetic shields. CERN, in collaboration with GSI Helmholtz Centre for Heavy Ion Research, Jena University, and the Helmholtz Institute Jena are currently developing an improved version of such a current monitor for the Antiproton Decelerator (AD) and Extra Low ENergy Antiproton (ELENA) rings. The primary goals are a better current measurement accuracy and overall enhanced system availability. This contribution presents the design of the CCC, an estimation of its resolution, dynamic limitations of the SQUID, as well as a description of the modifications to the coupling circuit and cryostat that were required to optimize the monitor for the anticipated beam parameters. First results from beam measurements are also presented. To our knowledge these are the first CCC beam current measurements performed in a synchrotron and the first to be performed with both coasting and bunched beams.
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