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T: Fachverband Teilchenphysik
T 125: Beschleunigerphysik XII (Kurze Pulse)
T 125.9: Vortrag
Donnerstag, 7. März 2013, 16:00–16:15, WIL-C205
Status of the short bunch operation project at FLASH — Eugen Hass1, Alexander Kuhl1, •Marie Rehders1,2, Juliane Rönsch-Schulenburg1,2, Jörg Rossbach1, Holger Schlarb3, and Siegfried Schreiber3 — 1University of Hamburg — 2CFEL, Hamburg — 3DESY, Hamburg
The FEL FLASH (Free-Electron Laser in Hamburg) operates between 4.12 and 45nm. Typically photon pulses between 50 and 200fs are generated. Many users at FLASH work on pump-probe experiments, where time resolution is determined by the pulse duration. Therefore they have expressed a keen interest in being provided with shorter XUV pulses. The shortest possible SASE pulse is a single longitudinal optical mode of the FEL radiation. The most direct way to realize this at FLASH would be to reduce the electron bunch length to only a few μm at the entrance of the undulator section. In the ideal case a bunch charge of only 20pC is suited for the generation of such short bunches. Thus a shorter initial bunch length at the photo-cathode can be chosen, which in turn reduces the bunch compression required to reach single mode conditions. A new photo-injector laser with adjustable pulse duration is used to optimize the initial electron bunch length. Beam dynamic studies are being performed to optimize the injection and compression of small charge electron bunches, starting with the pulse parameters of the injector laser. Improvements of important diagnostics are under way to adapt for charges and bunch lengths that are very small compared to standard FLASH operation. An overview and current status of the project is given in this contribution.