Teichert, J.; Arnold, A.; Büttig, H.; Justus, M.; Kamps, T.; Lu, P.; Michel, P.; Lehnert, U.; Murcek, P.; Rudolph, J.; Schurig, R.; Seidel, W.; Vennekate, H.; Xiang, R.; Will, I.: FEL Operation with the Superconducting RF Photo Gun at ELBE. In: FEL2013: Proceedings of the 35th International Free-Electron Laser Conference, Manhattan, NY, USA, August 26-30 2013, 2013. - ISBN 978-3-95450-126-7, p. 136-139
http://accelconf.web.cern.ch/AccelConf/FEL2013/papers/mopso76.pdf
Open Access Version
Abstract:
The superconducting RF photoinjector (SRF gun) operating with a 31/2-cell niobium cavity and Cs2Te photocathodes is installed at the ELBE radiation center. The gun provides beams for ELBE as well as in a separate diagnostics beam line for beam parameter measurements. Since 2012 a new UV driver laser system developed by MBI has been installed for the SRF gun . It delivers CW or bust mode pulses with 13 MHz repetition rate or with reduced rates of 500, 200, and 100 kHz at an average UV power of about 1 W. The new laser allows the gun to serve as the driver for the infrared FELs at ELBE. In the first successful experiment a 250 μA beam with 3.3 MeV from SRF gun was injected into ELBE, further accelerated in the ELBE superconducting linac modules and then guided to the U100 undulator. First lasing was achieved at the wavelength of 41 μm. The spectrum, detuning curve and further parameters were measured.