Dresden 2014 – scientific programme

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BE: Beschleunigerphysik

BE 14: Particle Sources

BE 14.3: Talk

Thursday, April 3, 2014, 15:30–15:45, MOL 213

Conditioning status of the second XFEL gun at PITZ. — •Igor Isaev — DESY, Zeuthen, Germany

An RF photo gun is one of the key issues for the successful operation of modern linac based free electron lasers (FELs). The photo injector test facility at DESY, Zeuthen site (PITZ) develops high brightness electron sources for the European XFEL as well as for FLASH facility at DESY, Hamburg site. After the first gun for the European XFEL was conditioned at PITZ and installed for first RF tests at the European XFEL photo injector the second XFEL gun has been installed in October 2013 at PITZ for conditioning and characterization. An L-band 1.6- cell copper cavity is required to be conditioned up to 6.5 MW peak power at 650 us RF pulse length and 10 Hz repetition rate. This assumes stable gun run keeping ultra-high vacuum conditions needed for efficient operation of Cs2Te cathode and supporting low dark current level required for further usage of the gun in the superconducting linac environment. With established conditioning procedure has been applied in order to achieve the specifications. The results of the second XFEL gun conditioning will be reported in comparison with corresponding data obtained for the first gun. This includes conditioning rate comparison, RF signals and dark current measurements.