Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Beschleunigerphysik VI

HK 11.1: Vortrag

Montag, 15. März 2010, 16:45–17:00, HG ÜR 8

Focusing and spectral selection of laser-driven X-ray undulator radiation using magnetic quadrupole lenses — •Benno Zeitler1,2, Matthias Fuchs1,2, and Florian Grüner1,21Department für Physik, Ludwig-Maximilians-Universität, Am Coulombwall 1, 85748 Garching, Germany — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany

Magnetic quadrupole lenses are widely used in accelerator physics to transport charged particle beams. The chromaticity of these devices can be exploited to reduce the energy bandwidth of spontaneous undulator radation. This has been shown in a recent experiment by our group, using permanent magnet quadrupoles to focus a laser-driven electron beam. Furthermore, undulators have intrinsic focusing which is important for beam energies around 200 MeV used in this experiment. There is a significant change of the electron trajectories, and therefore of the beam waist position, which leads to a different energy-filter curve for the above setup. By including undulator focusing, an effective electron energy spread which is in excellent agreement with the measured photon spectrum was deduced.

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