Author: Wunderlich, S.
Paper Title Page
TUB04 Operation of FLASH with Short SASE-FEL Radiation Pulses 342
 
  • J. Rönsch-Schulenburg, E. Hass, N.M. Lockmann, T. Plath, M. Rehders, J. Roßbach
    Uni HH, Hamburg, Germany
  • G. Brenner, S. Dziarzhytski, T. Golz, H. Schlarb, B. Schmidt, E. Schneidmiller, S. Schreiber, B. Steffen, N. Stojanovic, S. Wunderlich, M.V. Yurkov
    DESY, Hamburg, Germany
 
  Funding: The project has been supported by the Federal Ministry of Education and Research of Germany (BMBF) under contract No. 05K10GU2 and FSP301
This paper de­scribes the ex­per­i­men­tal ac­tiv­ity on the gen­er­a­tion of very short FEL pulses in the soft x-ray range in the SASE-mode at the high-gain free-elec­tron laser FLASH [1, 2]. The key el­e­ment, a photo-in­jec­tor laser which is able to gen­er­ate laser pulses of about 2 ps FWHM has been op­ti­mized and com­mis­sioned. It al­lows the gen­er­a­tion of shorter bunches with low bunch charge (of up to 200 pC) di­rectly at the photo-cath­ode. Ini­tially shorter in­jec­tor laser pulses and thus shorter bunches eases the re­quired bunch com­pres­sion fac­tor for short pulses below 10 fs du­ra­tion which makes op­er­a­tion of the elec­tron beam for­ma­tion sys­tem to be more ro­bust with re­spect to jit­ters and col­lec­tive ef­fects. As a re­sult, over­all sta­bil­ity of SASE FEL per­for­mance is im­proved. In the op­ti­mal case sin­gle-spike op­er­a­tion can be achieved. In this paper the ex­per­i­men­tal re­sults on pro­duc­tion of short elec­tron bunches and the SASE per­for­mance using the new in­jec­tor laser will be shown and the mea­sured elec­tron bunch and FEL ra­di­a­tion prop­er­ties are dis­cussed. In ad­di­tion, op­ti­miza­tions of bunch di­ag­nos­tics for low charge and short bunches are dis­cussed.
 
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