Speaker
Yitong Duan
(Tsinghua University)
Description
Very-high-frequency (VHF) continuous-wave (CW) photocathode electron guns face critical multipactor issues that degrade performance. This study optimized the RF cavity geometry to suppress multipactor via CST simulations. A three-phase strategy was adopted, with fixed key parameters. The optimized cavity achieved smoother electromagnetic fields, reduced secondary electron impact energy deviation from $\delta_{\text{max}}$, and significantly lowered multipactor growth rate ($\alpha$) vs. the SHINE gun baseline, while retaining excellent RF performance. This confirms geometry optimization as an effective multipactor mitigation approach for VHF CW guns.
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Author
Yitong Duan
(Tsinghua University)
Co-authors
Lianmin Zheng
(Tsinghua University)
Ying-Chao Du
(Tsinghua University)