Recent Beam Parameter Measurement of the 2nd 3.5 cell SRF Gun for ELBE


Recent Beam Parameter Measurement of the 2nd 3.5 cell SRF Gun for ELBE

Arnold, A.; Freitag, M.; Lu, P.; Murcek, P.; Teichert, J.; Vennekate, H.; Xiang, R.; Kneisel, P.; Ciovati, G.; Turlington, L.

In May 2014 the 1st superconducting photo injector (SRF gun) at HZDR was replaced by a new gun, featuring a new resonator and cryostat. The intention for this upgrade was to reach higher beam energy, higher bunch charge and lower emittance at the same time. With the improved parameters first user experiments of the superconducting CW accelerator ELBE are to be served, that benefit from an increased average beam current at a given repetition rate of some hundred kHz.
Although the cavity performance stays behind its specifications (Ecath~12 MV/m), beam commissioning is underway. In order to lower the risk of particle contamination and to get enough robustness against vacuum events in this early stage, we started with a laser cleaned magnesium cathode (QE~1e-3) instead of our standard Cs2Te cathode. In this contribution we will report on detailed parameter measurements of the electron beam that has a repetition rate of 100 kHz and a bunch charge up to 300 pC.

Keywords: SRF gun; photo electron source; injector; ELBE; superconducting RF

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Publ.-Id: 24236