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Proceedings Paper

Hartmann wavefront measurements at FLASH
Author(s): Barbara Keitel; Bernhard Flöter; Svea Kreis; Marion Kuhlmann; Klaus Mann; Tobias Mey; Elke Plönjes; Bernd Schäfer; Kai Tiedtke
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Paper Abstract

We report on online measurements of photon beam parameters during mirror alignment in the soft x-ray spectral region of FLASH, the free-electron laser in Hamburg. A compact Hartmann sensor operating in the wavelength range from 6 to 35nm was used to determine the wavefront quality of individual free-electron laser (FEL) pulses during the alignment procedure as well as aberrations. Beam characterization and alignment of beamline BL3 was performed with λ13.5𝑛𝑚/ 116 accuracy for wavefront rms (W𝑟𝑚𝑠). Second moment beam parameters are computed using a spherical reference wavefront generated by a 5μm pinhole. The Hartmann sensor was used for alignment of the ellipsoidal focusing mirror of beamline BL3, resulting in a reduction of (W𝑟𝑚𝑠) by 33%.

Paper Details

Date Published: 3 May 2013
PDF: 7 pages
Proc. SPIE 8778, Advances in X-ray Free-Electron Lasers II: Instrumentation, 877814 (3 May 2013); doi: 10.1117/12.2020850
Show Author Affiliations
Barbara Keitel, Deutsches Elektronen-Synchrotron (Germany)
Bernhard Flöter, Laser-Lab. Göttingen e.V. (Germany)
Svea Kreis, Deutsches Elektronen-Synchrotron (Germany)
Marion Kuhlmann, Deutsches Elektronen-Synchrotron (Germany)
Klaus Mann, Laser-Lab. Göttingen e.V. (Germany)
Tobias Mey, Laser-Lab. Göttingen e.V. (Germany)
Elke Plönjes, Laser-Lab. Göttingen e.V. (Germany)
Bernd Schäfer, Laser-Lab. Göttingen e.V. (Germany)
Kai Tiedtke, Deutsches Elektronen-Synchrotron (Germany)

Published in SPIE Proceedings Vol. 8778:
Advances in X-ray Free-Electron Lasers II: Instrumentation
Thomas Tschentscher; Kai Tiedtke, Editor(s)

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