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TY - UNPB AU - Xu, W. AU - Belomestnykh, S.A. AU - Ben-Zvi, I. AU - Kayran, D. ED - Belomestnykh, Sergey ED - Hoffman, Caitlin M. ED - Schaa, Volker RW TI - Commissioning Program for the 704 MHz SRF Gun at BNL 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 - A 704 MHz superconducting RF photoemission electron gun for the R&D ERL project is under commissioning at BNL. It successfully generated the first photoemission beam in November 2014. The BNL SRF gun cavity operates well in CW mode up to 2 MV. However, its performance with inserted cathode stalk suffered due to multipacting in the quarter-wavelength choke-joint. A new multipacting-free cathode stalk was designed and tested. The test results proved that it is a truly “multipacting-free” stalk. With the new cathode, the gun is able to operate in CW mode. The total conditioning time of the new cathode stalk is very short. This paper describes configuration of the SRF gun test and the sub-systems. RF and thermal design of new cathode stalk and its conditioning results are presented. Finally, we report the latest results of the SRF gun commissioning, including the cavity performance, cathode QE measurements, beam current/energy measurements. PB - JACoW CP - Geneva, Switzerland ER -