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Proceedings Paper

Intensity interferometry measurements with hard x-ray FEL pulses at the Linac Coherent Light Source
Author(s): Sanghoon Song; Diling Zhu; Andrej Singer; Juhao Wu; Marcin Sikorski; Matthieu Chollet; Henrik Lemke; Roberto Alonso-Mori; James M. Glownia; Jacek Krzywinski; Alberto Lutman; Yuantao Ding; Timothy Maxwell; James L. Turner; Oleg Gorobtsov; Ivan A. Vartanyants; Aymeric Robert; Yiping Feng
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Paper Abstract

Intensity interferometry measurements were carried out to study the spatial coherence properties of a Free-Electron Laser (FEL) in the Self-Amplified Spontaneous Emission (SASE) mode in the hard X-ray regime. Statistical analyses based on ensemble averages of the spatial intensity correlation function were performed on a large number of pulses, overcoming challenges associated with the FEL beam being non-stationary in time and highly collimated. The second-order intensity correlation functions consistently show deviations from unity, reminiscent of the classical Hanbury-Brown and Twiss effect. They also exhibit a slow decaying spatial dependence at length-scales larger than the width of the beam, indicating a high degree of spatial coherence. These measurements are consistent with the behavior of a highly brilliant but chaotic source obeying Gaussian statistics as expected for a SASE FEL. Our study could be used to devise an in-line diagnostic capable of providing quasi real-time feedback for understanding and tuning the FEL process.

Paper Details

Date Published: 8 October 2014
PDF: 10 pages
Proc. SPIE 9210, X-Ray Free-Electron Lasers: Beam Diagnostics, Beamline Instrumentation, and Applications II, 92100M (8 October 2014); doi: 10.1117/12.2069362
Show Author Affiliations
Sanghoon Song, SLAC National Accelerator Lab. (United States)
Diling Zhu, SLAC National Accelerator Lab. (United States)
Andrej Singer, Univ. of California, San Diego (United States)
Juhao Wu, SLAC National Accelerator Lab. (United States)
Marcin Sikorski, SLAC National Accelerator Lab. (United States)
Matthieu Chollet, SLAC National Accelerator Lab. (United States)
Henrik Lemke, SLAC National Accelerator Lab. (United States)
Roberto Alonso-Mori, SLAC National Accelerator Lab. (United States)
James M. Glownia, SLAC National Accelerator Lab. (United States)
Jacek Krzywinski, SLAC National Accelerator Lab. (United States)
Alberto Lutman, SLAC National Accelerator Lab. (United States)
Yuantao Ding, SLAC National Accelerator Lab. (United States)
Timothy Maxwell, SLAC National Accelerator Lab. (United States)
James L. Turner, SLAC National Accelerator Lab. (United States)
Oleg Gorobtsov, Deutsches Elektronen-Synchrotron (Germany)
Ivan A. Vartanyants, Deutsches Elektronen-Synchrotron (Germany)
Aymeric Robert, SLAC National Accelerator Lab. (United States)
Yiping Feng, SLAC National Accelerator Lab. (United States)


Published in SPIE Proceedings Vol. 9210:
X-Ray Free-Electron Lasers: Beam Diagnostics, Beamline Instrumentation, and Applications II
Stefan P. Hau-Riege; Stefan P. Moeller; Makina Yabashi, Editor(s)

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