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TY - CONF AU - Qian, H.J. AU - Barbanotti, S. AU - Gorchakov, A.A. AU - Gusarova, M. AU - Petersen, B. AU - Shu, G. AU - Stephan, F. AU - Vogel, E. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - A Cryocooled Normal Conducting and Superconducting Hybrid CW RF Gun J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - Continuous wave (CW) photoinjectors have seen great progress in the last decades, such as DC gun, superconducting RF (SRF) gun and normal conducting (NC) gun. Developments of Free electron lasers and electron microscopy in the CW mode are pushing for further improvements of CW guns towards higher acceleration gradient, higher beam energy and compatibility with high QE cathodes for better beam brightness. Current SC gun gradient is limited by the cathode cell due to the complication of a cathode back plane and a normal conducting cathode plug, and R&D on SC gun improvement is ongoing. A high gradient cryocooled CW NC gun was proposed to house the high QE cathode, and a SC cavity immediately nearby gives further energy acceleration. In this paper, further RF optimization of the NC gun and ASTRA simulations of such a hybrid photoinjector are presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1091 EP - 1094 KW - cavity KW - gun KW - cathode KW - acceleration KW - emittance DA - 2019/08 PY - 2019 SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-THP081 UR - http://jacow.org/srf2019/papers/thp081.pdf ER -