Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Beschleuniger II

HK 45.4: Talk

Wednesday, March 23, 2011, 17:30–17:45, A-1

Long optical undulators with Traveling-Wave Thomson Scattering — •Alexander Debus, Klaus Steiniger, Mathias Siebold, Axel Jochmann, Arie Irman, Michael Bussmann, Ulrich Schramm, Thomas Cowan, and Roland Sauerbrey — Forschungzentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328 Dresden, Germany

We present a novel concept for optical undulators that avoids the restrictions by the Rayleigh limit of the laser, which allows to define interaction length and diameter independent of each other. With an ultrashort, high-power laser pulse in an oblique angle scattering geometry using tilted pulse fronts, electrons and laser remain overlapped while both beams travel over distances much longer than the Rayleigh length. This allows to realize side-scattering in laser-electron beam interactions, without compromises with regard to luminosity or overlap. This is of particular interest for linac-driven Thomson sources, where this Traveling-wave Thomson scattering (TWTS) setup could increase per pulse photon yields 2-3 orders of magnitudes beyond current head-on (180°) scattering designs. Also, the smallest achievable scattered bandwidth is controlled by the width of a cylindrically focused laser beam and thus is independent of the ultrashort laser bandwidth. Due to the flexibility in side-scattering angle, photon energies become tunable over a large spectral range without requiring a change in electron energy.