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Wuppertal 2015 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 6: SC Resonators

AKBP 6.3: Talk

Tuesday, March 10, 2015, 14:15–14:30, BZ.08.06 (HS 1)

A Method for Quality Factor Measurements of the S-DALINAC Superconducting Cavities* — •Ruben Grewe, Christoph Burandt, Florian Hug, Thorsten Kürzeder, and Norbert Pietralla — Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany

The S-DALINAC is a recirculating superconducting linear electron accelerator designed for beam energies of up to 130 MeV. For acceleration it uses 20-cell niobium cavities that are operated 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 more than two 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 the assessment of q-factor improvements and for monitoring of q-factor variance over time, an in-situ method is needed. A phase-locked loop is used to make in-situ decay time measurements of the cavities. The presented method makes use of the extended adjusting capabilities of the S-DALINAC rf-input couplers to reach sufficiently low uncertainties of Δ Q0/Q0 < 10 %.

* Work supported by DFG through SFB 634

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