Bonn 2010 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 68: Beschleunigerphysik V

HK 68.6: Talk

Friday, March 19, 2010, 15:20–15:35, HG ÜR 4

Temporal overlap of electron bunch and soft x-ray pulse at sFLASH — •Roxana Tarkeshian¹, Armin Azima¹, Joern Boedewadt¹, Hossein Delsim-Hashemi¹, Markus Drescher¹, Stefan Duesterer², Josef Feldhaus², Katja Honkanavaara², Rasmus Ischebeck³, Shaukat Khan⁴, Tim Laarmann², Theophilos Maltezopoulos¹, Atoosa Meseck⁵, Velizar Miltchev¹, Manuel Mittenzwey¹, Juliane Roensch¹, Joerg Rossbach¹, Holger Schlarb², Siegfried Schreiber², Michael Schulz¹, and Marek Wieland¹ — ¹Hamburg University, Germany — ²DESY, Hamburg, Germany — ³PSI, Villigen, Switzerland — ⁴DELTA, TU Dortmund, Germany — ⁵Helmholtz-Zentrum Berlin, Berlin, Germany

sFLASH is a seeded free-electron Laser (FEL) experiment at DESY-Hamburg, which uses a High Harmonic Generation(HHG)-based XUV laser pulse, overlapping with the electron bunch at the entrance of the seeding undulators. The temporal overlap between the electron bunch (600fs FWHM) and the HHG pulse (30fs FWHM) is critical for the seeding. To ensure the overlap, the synchronization of the HHG drive laser (Lambda:800nm) and the incoherent undulator radiation is determined by using a streak camera. Afterwards interaction of HHG drive laser with the electron bunch will modulate the beam in the undulator. After a dispersive section this Inverse FEL modulated beam will produce coherent light on a screen or in the following undulator which proves the overlap of two beams. The enhancement of coherent light will be analyzed spectrally. The layout of the experiment and simulation results of generation and transport of both pulses are presented.