JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - CONF
AU - Tutt, P.R.
AU - Hartung, W.
AU - Kim, S.H.
AU - Xu, T.
ED - Saito, Kenji
ED - Xu, Ting
ED - Sakamoto, Naruhiko
ED - Schaa, Volker R.W.
ED - Thomas, Paul W.
TI - Investigation of Coupler Breakdown Thresholds for Plasma Processing of FRIB Quarter-Wave Resonators with Fundamental and Higher-Order Modes
J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023
CY - Grand Rapids, MI, USA
T2 - International Conference on RF Superconductivity
T3 - 21
LA - english
AB - FRIB is developing plasma processing techniques for in-situ recovery of cavity performance in linac cryomodules during long-term user operation. While plasma processing has been shown to be effective for high-frequency (0.8 - 1.5 GHz) elliptical cavities, one of the challenges for FRIB is to avoid plasma breakdown in the fundamental input coupler (FPC), which has relatively weak coupling strength (Q_{ext} ranging from 2E6 to 1E7). FRIB cavities are not equipped with higher-order-mode (HOM) couplers; however, in preliminary tests, we found that HOMs are suitable for plasma processing of FRIB Quarter-Wave Resonators (QWRs) driven via the FPC. In this study, we investigated plasma breakdown thresholds in the fundamental and the first 2 HOMs for the FRIB β = 0.085 QWRs. Electric field distributions in the FPC region and cavity region were calculated for the room-temperature case using CST Microwave Studio’s frequency domain solver (FDS). Simulation results will be presented, with comparison of breakdown thresholds inferred from the RF modeling to the experimental results.
PB - JACoW Publishing
CP - Geneva, Switzerland
SP - 893
EP - 897
DA - 2023/09
PY - 2023
SN - 2673-5504
SN - 978-3-95450-234-9
DO - doi:10.18429/JACoW-SRF2023-WEPWB127
UR - https://jacow.org/srf2023/papers/wepwb127.pdf
ER -