Diamond, Oxfordshire
DESY, Hamburg
Linac based Free Electron Lasers require very high quality and stable electron beams both for the lasing process, and for use of the FEL beams in experiments. Various kinds of jitter in the injector may sensitively affect the FEL operation. In this paper, we study the jitter sources in the FEL injector and simulate how much they impact on the beam dynamics. Then, we discuss the required jitter tolerances to maintain good machine performance. Measurements have been carried out at the FLASH Free Electron Laser at DESY and beam dynamics simulations are applied to the UK's New Light Source facility.
DESY Zeuthen, Zeuthen
INRNE, Sofia
DESY, Hamburg
YerPhI, Yerevan
JINR, Dubna, Moscow Region
UCLA, Los Angeles, California
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin
MEPhI, Moscow
NSC/KIPT, Kharkov
MBI, Berlin
At the Photo Injector Test facility at DESY, Zeuthen site, (PITZ) development and optimization of high brightness electron sources for Free Electron Lasers (FELs) like FLASH and the European XFEL are performed. In 2008, the PITZ facility was substantially upgraded. A new 1.6-cell L-band RF-gun cavity treated with an improved surface cleaning technique, a new photocathode laser system allowing shorter rise and fall times of the flat hat temporal distribution and several new diagnostics components have been installed. Since the transverse emittance is a key property of high brightness electron sources a major part of the measurement program at PITZ is devoted to the transverse phase space optimization. Recent results of emittance measurements using the upgraded facility are reported and discussed in this contribution.
DESY, Hamburg
The free-electron laser user facility FLASH at DESY, Germany is world-wide the only SASE-FEL operating in the VUV and the soft X-ray wavelengths range. Since summer 2005, FLASH operates as a user facility providing almost fully coherent, 10 femtosecond long laser radiation in the wavelength range from 47 nm to 6.5 nm with an unprecedented brilliance - many orders of magnitude higher than conventional facilities. The SASE radiation contains also higher harmonics. Several experiments have successfully used the third and fifth harmonics, in the latter case down to a wavelength of 1.59 nm. Starting autumn 2009, FLASH will be upgraded with an additional superconducting TESLA type accelerating module boosting its beam energy to 1.2 GeV. This will allow lasing below 5 nm. In addition, a 3rd harmonic accelerating module will be installed, which improves the longitudinal phase space and the overall performance of the facility.
