Dresden 2014 – wissenschaftliches Programm
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BE: Beschleunigerphysik
BE 12: Free-Electron Lasers
BE 12.2: Vortrag
Donnerstag, 3. April 2014, 10:00–10:15, MOL 213
Modal Analysis of a Seeded Free-Electron Laser — •Sven Ackermann1,2, Bart Faatz1, and Velizar Miltchev2 — 1Deutsches Elektronen-Synchrotron (DESY), Hamburg — 2Universität Hamburg, Hamburg
The free-electron lasers (FEL) are bright photon sources which emit light in a broad wavelength range down to some tenth of an Angstrom. The FELs became an indispensable tool for the scientific research in many fields like physics, biology, chemistry and medicine. Some FELs can amplify the radiation from an external laser field ("seed") which is a promising option to improve the coherence and temporal stability of the FEL radiation. In this contribution, we study the impact of the quality of the seed beam on the power of the output FEL radiation. By the means of numerical simulations the authors investigate the power of the radiation from an FEL seeded using a laser beam of different quality. The obtained results are then compared to experimental results from a directly seeded FEL operated in the XUV range. In addition, a method to measure the beam quality factor from single transverse intensity profiles is discussed and applied.
[1] S. Ackermann, B. Faatz, and V. Miltchev, Phys. Rev. ST Accel. Beams 16, 100702 (2013)