Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 71: Beschleunigerphysik XII (Kurze Pulse)

HK 71.6: Talk

Thursday, March 7, 2013, 15:15–15:30, WIL-C205

FLASH II - a Multi Beamline FEL facility. — •Sven Ackermann — DESY, Hamburg — Universität Hamburg

The Free-Electron Laser (FLASH) in Hamburg generates coherent XUV radiation used in various research projects. In order to provide more beam time for the growing community of photon users, DESY in collaboration with HZB started the FLASH II project in 2010. FLASH II is an extension of the existing FLASH facility consisting of a new undulator section in a separate tunnel and a new experimental hall. The two Free-Electron Lasers share the same super conducting linac. Due to the fixed gap undulators used in the present FLASH setup the radiation wavelength can be changed only by changing the electron energy. FLASH II, in contrast, will benefit from variable gap undulators which will allow to have largely independent radiation wavelength. For the generation of different electron bunch trains two different injector lasers will use the same photocathode RF gun. The linac will then accelerate the different bunch trains. This means that for the independent operation the gradients and phases of the superconducting acceleration modules have to be changed within the RF pulse. A first demonstration has been performed in 2012. In addition to the SASE operating mode, a HHG direct seeding option between 10 nm and 40 nm with a final repitition rate up to 100 kHz is foreseen. Other seeding schemes like HGHG, EEHG and Hybrid schemes are currently under investigation.