COMMISSIONING SRF GUN FOR THE R&D ERL AT BNL*

The R&D ERL project at BNL aims to demonstrate a high charge, high current Energy Recovery Linac (ERL). One of the key ERL systems is the 704 MHz half-cell Superconducting RF (SRF) photoemission gun. The SRF gun is designed to deliver up to 0.5 ampere beam at 2 MeV with 1 MW of CW RF power. The gun commissioning in the ERL block house started in November of 2012. After high power RF conditioning, the cavity is now able to operate at 2 MV in CW mode. This paper briefly addresses the SRF gun system design, then describes the cold emission tests and discusses the results.