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HK: Fachverband Physik der Hadronen und Kerne
HK 38: Beschleuniger - Poster
HK 38.12: Poster
Wednesday, March 23, 2011, 14:00–16:00, Foyer Chemie
Duration measurement of laser-accelerated electron bunches using single-shot THz time-domain interferometry — •Alexander Debus1, Michael Bussmann1, Ulrich Schramm1, Roland Sauerbrey1, and Stefan Karsch2 — 1Forschungzentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328 Dresden, Germany — 2Max-Planck-Institute für Quantenoptik, Hans- Kopfermann-Strasse 1, 85748 Garching, Germany
Laser-plasma wakefield based electron accelerators are expected to deliver ultrashort electron bunches of unprecedented peak currents. However, their actual pulse duration has never been directly measured in a single-shot experiment. We present measurements of the ultrashort duration of such electron bunches by means of THz time-domain interferometry from coherent transition radiation. Using a ZnTe-based electro-optical setup and a 0.5J, 45fs, 800nm laser beam, we demonstrate that the duration of quasi-monoenergetic electron bunches from laser-wakefield acceleration is 32fs (FWHM) at a best fit and below 38fs at a 90% confidence level.