Karlsruhe 2011 – scientific programme
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T: Fachverband Teilchenphysik
T 81: Strahldiagnose / CSR II
T 81.8: Talk
Tuesday, March 29, 2011, 18:30–18:45, 30.22: 022
Femtosecond stabilisation of long range optical beam transport for the seeding experiment at FLASH — •M. Rehders1, A. Azima1, J. Boedewadt1, F. Curbis1, H. Delsim-Hashemi1, M. Drescher1, U. Hipp1, T. Maltezopoulos1, V. Miltchev1, M. Mittenzwey1, J. Roensch-Schulenburg1, J. Rossbach1, R. Tarkeshian1, M. Wieland1, S. Bajt2, S. Duesterer2, J. Feldhaus2, T. Laarmann2, H. Schlarb2, S. Khan3, and R. Ischebeck4 — 1University of Hamburg — 2DESY, Hamburg — 3DELTA, Dortmund — 4PSI, Villigen, Switzerland
Free Electron Lasers (FEL) are usually operated in the self-amplified spontaneous emission mode (SASE). Side effects like a temporal jitter of the XUV pulses limit the resolution of laser/XUV pump-probe experiments. To overcome these limitations, a seeding experiment for wavelengths below 40 nm has been installed at the FEL FLASH in Hamburg. It has three stations: A high harmonic generation (HHG) laboratory, which contains the optical 800 nm driving laser and the HHG source. Secondly, the undulator section, where the seeding of the electron bunch takes place and thirdly, the experimental hutch for XUV pulse characterization. A fraction of the optical driving laser is guided over a distance of 60 m from the HHG laboratory into the experimental hutch for future characterization of the seeded XUV pulse. To ensure a good temporal resolution between the seeded XUV pulse and the optical pulse the arrival time of the optical laser pulse has to be stabilized. In this contribution the temporal stabilisation technique for the optical transport beamline will be presented in detail.