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- H.J. Qian, Y.-C. Du, J.F. Hua, W.-H. Huang, C. Li, C.-X. Tang, L.X. Yan
TUB, Beijing, People's Republic of China
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A new photocathode RF gun has been designed and fabricated to meet beam brightness requirements (0.5-1 nC, 1-2 mm mrad) of Tsinghua Thomson scattering project (TTX) and Shanghai soft X-ray free electron laser test facillity (SXFEL). Compared with classical BNL type gun, the new Tsinghua gun features improved cathode sealing structure, 0-mode and multipole field suppression, and higher quality factor. Single RF feed is kept in the new gun for simplicity, and beam dynamics due to single RF feed are investigated theoretically, which predict negligible emittance growth. After high power conditioning, the new gun operates stably with a peak acceleration gradient of ~120 MV/m. Measurements of dark current, Quantum Efficiency (QE), and transverse emittance are presented and discussed in this paper.
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