Bonn 2010 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 89: Beschleunigerphysik XII
T 89.2: Vortrag
Dienstag, 16. März 2010, 17:05–17:20, HG ÜR 9
Laser-driven soft-X-ray undulator source — •Matthias Fuchs1,2, Raphael Weingartner1,2, Antonia Popp1, Zsuzsanna Major1,2, Stefan Becker2, Jens Osterhoff1,2, Isabella Cortrie2, Benno Zeitler1,2, Rainer Hörlein1,2, George D. Tsakiris1, Ulrich Schramm3, Tom P. Rowlands-Rees4, Simon M. Hooker4, Dietrich Habs1,2, Ferenc Krausz1,2, Stefan Karsch1,2, and Florian Grüner1,2 — 1Max-Planck-Institut für Quantenoptik, Garching, Germany — 2Ludwig-Maximilians-Universität, Garching, Germany — 3Forschungszentrum Dresden-Rossendorf, Germany — 4University of Oxford, U.K.
Latest developments of laser-wakefield accelerators (LWFA) have led to relatively stable electron beams from cm-scale interaction lengths. These beams are supposed to have ultrashort bunch durations and low normalized transverse emittances, which makes them perfectly suited for driving high-brightness undulator-based X-ray sources on a laboratory scale. We will present an experimental breakthrough: our laser-driven soft-X-ray undulator source. We were able to detect spectrally resolved undulator radiation with a fundamental at 18 nm in 70% of consecutive driver-laser shots, which is a remarkably high reproducibility for an LWFA experiment. This was achieved mainly due to the stable electron beam and our miniature magnetic quadrupole lenses which markedly reduce the divergence and the angular shot-to-shot fluctuations of the electron beam. The lenses act as an effective bandpass filter for the undulator radiation and so decrease the shot-to-shot variation as well as let us tune the wavelength of the radiation.