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Wuppertal 2015 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 4: FEL, Seeding and Thomson Scattering

AKBP 4.8: Talk

Monday, March 9, 2015, 18:30–18:45, F.10.01 (HS 4)

Demonstration of SASE suppression through a seeded microbunching instability — •Christoph Lechner1, Sven Ackermann2, Armin Azima1, Jörn Bödewadt2, Günter Brenner2, Martin Dohlus2, Markus Drescher1, Nagitha Ekanayake2, Torsten Golz2, Kirsten Hacker3, Katja Honkavaara2, Shaukat Khan3, Tim Laarmann2, Leslie Lamberto Lazzarino2, Torsten Limberg2, Theophilos Maltezopoulos1, Velizar Miltchev1, Robert Molo3, Tim Plath1, Juliane Rönsch-Schulenburg1, Jörg Rossbach1, Evgeny Schneidmiller2, Nikola Stojanovic2, and Mikhail Yurkov21University of Hamburg, Hamburg — 2DESY, Hamburg — 3TU Dortmund University, Dortmund

Collective effects and instabilities due to longitudinal space charge and coherent synchrotron radiation can degrade the quality of the ultra-relativistic, high-brightness electron bunches needed for the operation of free-electron lasers (FELs). In this contribution, we demonstrate the application of a laser-induced microbunching instability to manipulate the electron bunch properties and selectively suppress FEL lasing. A significant decrease of photon pulse energies was observed at the FEL user facility FLASH in coincidence with overlap of 800 nm laser pulses and electron bunches within a modulator located approximately 40 meters upstream of the undulators. We discuss these effects in the framework of longitudinal space charge amplification [E.A. Schneidmiller and M.V. Yurkov, Phys. Rev. ST Accel. Beams 13, 110701 (2010)] and present experimental results.

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