Speaker
Description
Cryogenic Current Comparators (CCC) are superconducting devices for beam current monitoring, based on azimuthal magnetic field (fT range) measurement with ultrasensitive SQUID magnetometers. They are able to provide a calibrated non-destructive measurement of beam current with a resolution of 10 nA or better, independent from ion species and without tedious calibrations procedure.
We have developed the CCC over the last ten years in an international collaboration with the goal of a highly sensitive and continuous current measurement in the transfer lines and rings at FAIR and CERN machines. Besides the efforts to improve the robustness and current resolution of the device, investigations have been performed on the cryogenic support system, which has to provide stand alone operation in HEBT tunnels without He supply. So far we have achieved standing times in the range of 6 - 9 months after liquid He filling, recently we have demonstrated stand alone He liquefaction from gas bottles within ~ 4 weeks, which would avoid He filling in the tunnels. In this contribution we present the status and results of our current work with focus on the cryogenics aspects.
Funding Agency
Work supported by the BMBF under contracts No. 05P21SJRB1 and 05K25SJA
Footnotes
Work supported by the BMBF under contract No. 05P21SJRB1
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