Wuppertal 2015 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 4: FEL, Seeding and Thomson Scattering
AKBP 4.1: Vortrag
Montag, 9. März 2015, 16:45–17:00, F.10.01 (HS 4)
Seeding at FLASH -- Challenges and perspectives — Joern Boedewadt1, Ralph Assmann1, Nagitha Ekanayake1, Bart Faatz1, Ingmar Hartl1, Rosen Ivanov1, Tim Laarmann1, Jost Mueller1, Kirsten Elaine Hacker3, Shaukat Khan3, Robert Molo3, Sven Ackermann1, Philipp Amstutz2, Armin Azima2, Markus Drescher2, Leslie Lamberto Lazzarino2, Christoph Lechner2, Theophilos Maltezopoulos2, •Tim Plath2, and Jörg Rossbach2 — 1Deutsches Elektronen-Synchrotron (DESY), Hamburg — 2Universität Hamburg, Hamburg — 3DELTA, Dortmund
Free-Electron Lasers (FELs) operated in the self-amplified spontaneous emission (SASE) mode start from shot-noise. The chaotic behaviour of this statistical process entails limited longitudinal coherence and spectral shot-to-shot stability of the emitted photon pulse. These drawbacks can be overcome by seeding the FEL process with an external light field.
The linear accelerator at the FLASH user facility drives two undulator beamlines, FLASH1 and FLASH2.
At FLASH1, the seeding experiment comprises two electro-magnetic undulators, three chicanes, and a variable-gap undulator system. Thanks to this variable infrastructure, the FLASH1 seeding beamline is an ideal test bed to study different seeding schemes and to learn from experiments for the design of FLASH2 seeding.
In this contribution we report on current activities at FLASH1 and possible seeding options for the second FEL beamline FLASH2.