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HK: Fachverband Physik der Hadronen und Kerne
HK 68: Beschleunigerphysik V
HK 68.3: Vortrag
Freitag, 19. März 2010, 14:35–14:50, HG ÜR 4
Transverse beam diagnostics for seeding the free-electron laser FLASH — •Joern Boedewadt1, Armin Azima1, Francesca Curbis1, Hossein Delsim-Hashemi1, Markus Drescher1, Theophilos Maltezopoulos1, Velizar Miltchev1, Manuel Mittenzwey1, Joerg Rossbach1, Sebastian Schulz1, Michael Schulz1, Roxana Tarkeshian1, Marek Wieland1, Atoosa Meseck3, Shaukat Khan5, Stefan Dusterer2, Josef Feldhaus2, Tim Laarmann2, Holger Schlarb2, Sase Bajt2, and Rasmus Ischebeck4 — 1Universität Hamburg, Germany — 2Deutsches Elektronen Sychrotron DESY, Hamburg, Germany — 3Helmholz-Zentrum Berlin, Germany — 4PSI, Villingen, Switzerland — 5Technische Universität DELTA, Dortmund, Germany
The free-electron laser in Hamburg (FLASH) delivers intense femtosecond pulses in the extreme ultra violet (XUV) and soft X-ray spectral range for experiments in material science or time resolved atomic physics. These XUV pulses are generated by the interaction of ultra relativistic electron bunches and the spontaneously emitted synchrotron radiation within an undulator. Due to the statistic behavior of the spontaneous emission of light the spectral distribution of the FEL pulses changes from shot to shot. By seeding the FEL process with an external laser field these fluctuation can be decreased. At FLASH a direct seeding scheme for wavelengths below 40 nm is presently realized. This talk will present the concepts and the diagnostics to control the transverse overlap of the seed and the electron beam.