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TY - UNPB AU - Xie, H.M. AU - Belomestnykh, S.A. AU - Ben-Zvi, I. AU - Kayran, D. AU - McIntyre, G.T. AU - Sheehy, B. AU - Than, R. AU - Wang, E. AU - Weiss, D. AU - Xu, W. ED - Belomestnykh, Sergey ED - Hoffman, Caitlin M. ED - Schaa, Volker RW TI - Characterization of Multi-alkali Antimonide Cathode at Cryogenic Temperatures and its Performance in SRF Gun J2 - Proc. of ERL2015, Stony Brook, NY, USA, June 7-12, 2015 C1 - Stony Brook, NY, USA T2 - ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs T3 - 56 LA - english AB - An alkali antimonide photocathode was tested in BNL 704 MHz SRF gun. The cathode QE and lifetime were measured inside the gun. We also observed a reduction on the QE upon cooling down to cryogenic temperature. In this paper, we propose an analytical model and present a Monte-Carlo simulation code to explain this QE decrease. Both results compared with experiments. Effect of cooling the cathode to cryogenic temperature and Schottky effect on QE will be discussed. PB - JACoW CP - Geneva, Switzerland ER -