Speaker
Description
The CLARA accelerator at Daresbury Laboratory has recently commissioned a new electron gun as part of a larger upgrade to the machine. The new gun (‘HRRG’) is a high rep rate (400 Hz) 1.5 cell cavity (3 GHz fundamental frequency) designed to produce low emittance beams up to 5 MeV/c, with gradients cathode field up to 120 MV/m and RF pulse lengths of up to 3 us. The previous CLARA gun (‘LRRG’) was a similar 2.5 cell device but low rep rate (10 Hz). Dark current emitted from the gun is an important issue for several reasons, so is monitored and managed throughout CLARA commissioning and user operation. We present results from the dark current measurements from the new HRRG gun through its commissioning and early stage operation, and make a comparison to those taken from the previous LRRG gun.
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