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Title: Performance of a hard X-ray split-and-delay optical system with a wavefront division

The performance of a hard X-ray split-and-delay optical (SDO) system with a wavefront division scheme was investigated at the hard X-ray free-electron laser facility SACLA. For the wavefront division, beam splitters made of edge-polished perfect Si(220) crystals were employed. We characterized the beam properties of the SDO system, and investigated its capabilities for beam manipulation and diagnostics. First, it was confirmed that shot-to-shot non-invasive diagnostics of pulse energies for both branches in the SDO system was feasible. Second, nearly ideal and identical focal profiles for both branches were obtained with a spot size of ~1.5 µm in full width at half-maximum. Third, a spatial overlap of the two focused beams with a sub-µm accuracy was achieved by fine tuning of the SDO system. Finally, a reliable tunability of the delay time between two pulses was confirmed. The time interval was measured with an X-ray streak camera by changing the path length of the variable-delay branch. As a result, errors from the fitted line were evaluated to be as small as ±0.4 ps over a time range of 60 ps.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ;  [1] ;  [1] ;  [3] ;  [3] ;  [4] ;  [1] ; ORCiD logo [3] ; ORCiD logo [5] ;  [5] ;  [1] ; ORCiD logo [4]
  1. Osaka Univ., Osaka (Japan)
  2. Osaka Univ., Osaka (Japan); RIKEN SPring-8 Center, Hyogo (Japan)
  3. RIKEN SPring-8 Center, Hyogo (Japan); Japan Synchrotron Radiation Research Institute (JASRI), Hyogo (Japan)
  4. RIKEN SPring-8 Center, Hyogo (Japan)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
JP17J01667; AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Journal of Synchrotron Radiation (Online)
Additional Journal Information:
Journal Name: Journal of Synchrotron Radiation (Online); Journal Volume: 25; Journal Issue: 1; Journal ID: ISSN 1600-5775
Publisher:
International Union of Crystallography
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; hard X-ray free-electron laser; split-and-delay optics; multi-crystal optics; X-ray photon correlation spectroscopy
OSTI Identifier:
1417639