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Continuous-Wave Operation at 30 MV/m of a Superconducting Radio-Frequency Gun Cryomodule with an Exchangeable Cathode Plug
Abstract
A prototype 185.7 MHz superconducting radio-frequency (SRF) electron gun cryomodule has been developed for the proposed LCLS-II-HE Low Emittance Injector at SLAC. It has an in-situ ultra-high-vacuum exchangeable cathode plug system compatible with semiconductor photocathodes. With a copper plug, the gun achieved continuous-wave RF operation at a cathode field of 30 MV/m. No measurable degradation was observed after plug removal and reinsertion with the cavity at 4.4 K. This result is a significant improvement over past continuous-wave SRF gun systems with exchangeable plugs.
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BibTeX
@misc{konomi2026continuouswave,
title = {{Continuous-Wave Operation at 30 MV/m of a Superconducting Radio-Frequency Gun Cryomodule with an Exchangeable Cathode Plug}},
author = {T. Konomi and T. Xu and Y. Choi and K. Elliott and B. Gower and B. Tousignant and J. Wenstrom and A. Taylor and C. Compton and W. Chang and X. Du and W. Hartung and S. H. Kim and S. Miller and D. Morris and M. Patil and L. Popielarski and J. Wei and Z. Yin and J. Smedley and J. Maniscalco and C. Adolphsen and M. Murphy and D. A. Gonnella and M. P. Kelly and T. Petersen and A. Arnold and S. Gatzmaga and R. Steinbrück and P. Murcek and R. Xiang and J. Teichert and J. Lewellen},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.12233},
eprint = {2609.12233},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.12233},
}
RIS
TY - UNPB
TI - Continuous-Wave Operation at 30 MV/m of a Superconducting Radio-Frequency Gun Cryomodule with an Exchangeable Cathode Plug
AU - T. Konomi
AU - T. Xu
AU - Y. Choi
AU - K. Elliott
AU - B. Gower
AU - B. Tousignant
AU - J. Wenstrom
AU - A. Taylor
AU - C. Compton
AU - W. Chang
AU - X. Du
AU - W. Hartung
AU - S. H. Kim
AU - S. Miller
AU - D. Morris
AU - M. Patil
AU - L. Popielarski
AU - J. Wei
AU - Z. Yin
AU - J. Smedley
AU - J. Maniscalco
AU - C. Adolphsen
AU - M. Murphy
AU - D. A. Gonnella
AU - M. P. Kelly
AU - T. Petersen
AU - A. Arnold
AU - S. Gatzmaga
AU - R. Steinbrück
AU - P. Murcek
AU - R. Xiang
AU - J. Teichert
AU - J. Lewellen
PY - 2026
DA - 2026/10/02
PB - arXiv
DO - 10.48550/arxiv.2609.12233
UR - https://arxiv.org/abs/2609.12233
AB - A prototype 185.7 MHz superconducting radio-frequency (SRF) electron gun cryomodule has been developed for the proposed LCLS-II-HE Low Emittance Injector at SLAC. It has an in-situ ultra-high-vacuum exchangeable cathode plug system compatible with semiconductor photocathodes. With a copper plug, the gun achieved continuous-wave RF operation at a cathode field of 30 MV/m. No measurable degradation was observed after plug removal and reinsertion with the cavity at 4.4 K. This result is a significant improvement over past continuous-wave SRF gun systems with exchangeable plugs.
ER -