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Title: Spectral encoding method for measuring the relative arrival time between x-ray/optical pulses

The advent of few femtosecond x-ray light sources brings promise of x-ray/optical pump-probe experiments that can measure chemical and structural changes in the 10–100 fs time regime. Widely distributed timing systems used at x-ray Free-Electron Laser facilities are typically limited to above 50 fs fwhm jitter in active x-ray/optical synchronization. The approach of single-shot timing measurements is used to sort results in the event processing stage. This has seen wide use to accommodate the insufficient precision of active stabilization schemes. In this article, we review the current technique for “measure-and-sort” at the Linac Coherent Light Source at the SLAC National Accelerator Laboratory. The relative arrival time between an x-ray pulse and an optical pulse is measured near the experimental interaction region as a spectrally encoded cross-correlation signal. The cross-correlation provides a time-stamp for filter-and-sort algorithms used for real-time sorting. Sub-10 fs rms resolution is common in this technique, placing timing precision at the same scale as the duration of the shortest achievable x-ray pulses.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [4] ;  [4] more »;  [3] ;  [6] ;  [7] ;  [8] ; « less
  1. Université de Toulouse, UPS, Laboratoire Collisions Agrégats Réactivité, IRSAMC, F-31062 Toulouse (France)
  2. (France)
  3. (United States)
  4. The Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025 (United States)
  5. (Switzerland)
  6. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States)
  7. Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551 (United States)
  8. Mesa Photonics, LLC., 1550 Pacheco St., Santa Fe, New Mexico 87505 (United States)
Publication Date:
OSTI Identifier:
22314416
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 43 PARTICLE ACCELERATORS; ACCURACY; ALGORITHMS; CORRELATIONS; FILTERS; FREE ELECTRON LASERS; LIGHT SOURCES; OPTICAL PUMPING; PULSES; RESOLUTION; REVIEWS; SIGNALS; STANFORD LINEAR ACCELERATOR CENTER; SYNCHRONIZATION; X RADIATION