Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 72: Beschleunigerphysik XIII (Synchrotronstrahlung/THz)

HK 72.6: Talk

Thursday, March 7, 2013, 15:15–15:30, WIL-C207

A Transmittive Photon Flux Detector for Laser-Plasma-Driven Soft X-Ray Undulator Radiation — •Niels Delbos, Christian Werle, Benno Zeitler, Andreas Richard Maier, and Florian Grüner — University of Hamburg, Center for Free-Electron Laser Science

In recent experiments early 2012 our group demonstrated the energy tunability of a laser-plasma driven undulator source, emitting ultrashort soft x-ray (SXR) pulses of only a few femtoseconds with energies up to the water window.

Based on these results, the next step is to use the generated SXR pulses in pump-probe experiments. The photon flux of the undulator, however, is subject to fluctuations, as the electron beam parameters vary from shot to shot. Hence a diagnostic, measuring the photon flux on-line with high transmission, efficiency and sensitivity is needed to bedeveloped for future experiments.

Since SXR radiation shows a characteristically high degree of absorption in matter,the development of a detector that meets the particularly high requirements posed a considerable challenge. This talk discusses the development and calibration of a detector, which is easy to use and shows high and adjustable transmission for a broad photon energy range, based on the photoionization of noble gases.