Dresden 2014 – wissenschaftliches Programm
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BE: Beschleunigerphysik
BE 8: Diagnostics and Instrumentation III
BE 8.4: Vortrag
Mittwoch, 2. April 2014, 10:15–10:30, ZEU 255
In-situ quality factor measurement of the S-DALINAC* superconducting cavities — •Ruben Grewe, Christoph Burandt, Florian Hug, Thorsten Kürzeder, Patrick Nonn, and Norbert Pietralla — Institut für Kernphysik, TU Darmstadt, Darmstadt, Germany
The S-DALINAC is a recirculating superconducting linear electron accelerator designed for beam energies of up to 130 MeV. For the main acceleration it uses ten 20-cell niobium cavities which are cooled in a liquid helium bath at 2 K. While operational experience showed that the design electric field gradient of 5 MV/m can be reached and exceeded, it was found that the quality factor is three or more times worse than the design value of 3·109. This results in more power being dissipated into the liquid helium bath which limits the electric field gradient for CW operation.
For a better analysis it is necessary to observe the long term change of the quality factor of the cavities in the accelerator cryostats. The system presented is going to use the rf control system developed at the S-DALINAC to obtain the quality factors with decay time measurements.
*Work supported by DFG through SFB 634