Experiences with the SRF Gun II for User Operation at the ELBE Radiation Source

Experiences with the SRF Gun II for User Operation at the ELBE Radiation Source

Teichert, J.; Arnold, A.; Bawatna, M.; Evtushenko, P. E.; Gensch, M.; Green, B. W.; Kovalev, S.; Lehnert, U.; Lu, P. N.; Michel, P.; Murcek, P.; Vennekate, H.; Xiang, R.

The second version of the superconducting RF photoinjector (SRF Gun II) was successfully commissioned at the ELBE radiation source in 2014. The gun features an improved 3.5-cell niobium cavity combined with a superconducting solenoid integrated in the cryostat. With a Mg photocathode the SRF Gun II is able to generate bunches with up to 200 pC and with sub-ps length in CW mode with 100 kHz pulse frequency for the THz radiation facility at ELBE. In the ELBE linac, the beam is accelerated, gets a proper correlated energy spread, and is compressed in a magnetic chicane. Sub-ps pulses are obtained producing coherent diffraction radiation and superradiant undulator radiation.

Keywords: electron source; SRF gun; superconducting RF; THz radiation; coherent diffration radiation; superradiant radiation; ELBE

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