Experimental studies of dark current in a superconducting RF photo-injector


Experimental studies of dark current in a superconducting RF photo-injector

Xiang, R.; Arnold, A.; Kamps, T.; Lu, P.; Michel, P.; Murcek, P.; Vennekate, H.; Staats, G.; Teichert, J.

A superconducting RF photo injector (SRF gun) has been put in operation successfully at the radiation source ELBE. It produces a 13 MHz, low emittance, CW beam with beam current up to 400 μA and energy of 3 MeV. During the gun operation, the field emission from the niobium cavity and the Cs2Te cathodes produces dark current. In this work, we studied the dark current of the SRF gun by using the existing diagnostics beam line. The dependency of the intensity and the energy spectrum on the cavity gradient and the cathode voltage were examined, and the emission sources were analyzed. Furthermore, the new project of installing a strip line kicker to reduce the dark current effect is presented.

Keywords: SRF gun; field emission; dark current; niobium cavity; Cs2Te cathode; energy spectrum

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Publ.-Id: 19894