Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 27: Ultrashort Laser Pulses: Applications I

Q 27.8: Talk

Wednesday, March 10, 2010, 12:15–12:30, F 342

Design considerations for high-yield x-ray sources using travelling-wave Thomson scattering — •Alexander Debus, Matthias Siebold, Axel Jochmann, Michael Bussmann, Ulrich Schramm, and Roland Sauerbrey — Forschungzentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328 Dresden, Germany

Our design of a high-yield Thomson source makes use of the compact electron bunches, as achievable from laser wakefield accelerators or advanced, low-emittance linear accelerators. We show that the restrictions on the x-ray photon yield by the Rayleigh limit can be avoided with an ultrashort laser pulse in an oblique angle scattering geometry using tilted pulse fronts, where electrons and laser remain overlapped while both beams travel over distances much longer than the Rayleigh length. For large scattering angles up to 75^∘ the use of varied line-spacing (VLS) gratings is proposed for spatio-temporal beam shaping to achieve optimal overlap. Compared to head-on (180^∘) Thomson scattering the photon numbers for ultrashort and bright x-ray pulses could with this approach be improved by several orders of magnitude. For small interaction angles (≤ 10^∘) interaction distances can be scaled up into the meter range, which could make the SASE-FEL regime accessible using optical undulators driven by existing laser technology.