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Proceedings Paper

Single-shot beam profile diagnostics for x-ray FEL's using gas fluorescence
Author(s): Yiping Feng; Diling Zhu; Clemens Weninger; Roberto Alonso-Mori; Matthieu Chollet; Daniel S. Damiani; James M. Glownia; Jerome B. Hastings; Silke Nelson; Sanghoon Song; Aymeric Robert
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Paper Abstract

We report experimental demonstration of capturing single-shot X-ray Free-electron Laser (FEL) beam profiles using gas fluorescence. The measurement was carried out at the Linac Coherent Light Source using 7 keV hard X-rays propagating through ambient air. The nitrogen fluorescence emitted upon the passage of the X-ray FEL beam were imaged using a highly sensitive optical setup, and there was sufficient optical yield that single-shot measurements were feasible. By taking two orthogonal and simultaneous images, the beam trajectory could be determined in a nearly non-invasive manner, and is best suited for photon energies in the soft X-ray regime, where such a diagnostic capability has been largely unavailable previously. The integrated intensity of the images could also serve as a non-invasive intensity monitor, complementary to current implementations of gas- and solidbased monitors. High repetition-rate Free-electron Lasers can greatly benefit from such a new diagnostic tool for eliminating potential thermal damages.

Paper Details

Date Published: 14 June 2017
PDF: 7 pages
Proc. SPIE 10237, Advances in X-ray Free-Electron Lasers Instrumentation IV, 102370M (14 June 2017); doi: 10.1117/12.2268862
Show Author Affiliations
Yiping Feng, SLAC National Accelerator Lab. (United States)
Diling Zhu, SLAC National Accelerator Lab. (United States)
Clemens Weninger, SLAC National Accelerator Lab. (United States)
Roberto Alonso-Mori, SLAC National Accelerator Lab. (United States)
Matthieu Chollet, SLAC National Accelerator Lab. (United States)
Daniel S. Damiani, SLAC National Accelerator Lab. (United States)
James M. Glownia, SLAC National Accelerator Lab. (United States)
Jerome B. Hastings, SLAC National Accelerator Lab. (United States)
Silke Nelson, SLAC National Accelerator Lab. (United States)
Sanghoon Song, SLAC National Accelerator Lab. (United States)
Aymeric Robert, SLAC National Accelerator Lab. (United States)


Published in SPIE Proceedings Vol. 10237:
Advances in X-ray Free-Electron Lasers Instrumentation IV
Thomas Tschentscher; Luc Patthey, Editor(s)

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