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Title: Design and performance characterisation of the HAPG von Hámos Spectrometer at the High Energy Density Instrument of the European XFEL

Journal Article · · Journal of Instrumentation
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  1. European X-ray Free-Electron Laser (XFEL), Hamburg (Germany)
  2. Helmholtz-Zentrum Dresden, (Germany)
  3. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  4. Sorbonne Univ., Paris (France)
  5. Univ. of California, Berkeley, CA (United States)
  6. Helmholtz-Zentrum Dresden, (Germany); Dresden Univ. of Technology (Germany); Inst. of Physics of the ASCR (Czech Republic)
  7. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  8. Helmholtz-Zentrum Dresden, (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  9. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  10. Univ. of Oxford (United Kingdom)
  11. Helmholtz-Zentrum Dresden, (Germany); Dresden Univ. of Technology (Germany)
+ Show Author Affiliations

The von Hámos spectrometer setup at the HED instrument of the European XFEL is described in detail. The spectrometer is designed to be operated primarily between 5 and 15 keV to complement the operating photon energy range of the HED instrument. Four Highly Annealed Pyrolitic Graphite (HAPG) crystals are characterised with thicknesses of 40 μm or 100 μm and radius-of-curvature 50 mm or 80 mm, in conjunction with either an ePix100 or Jungfrau detector. The achieved resolution with the 50 mm crystals, operated between 6.5 and 9 keV, matches that reported previously: ~8 eV for a thickness of 40 μm, whereas, with an 80 mm crystal of thickness 40 μm, the resolution exceeds that expected. Namely, a resolution of 2 eV is demonstrated between 5–6 keV implying a resolving power of 2800. Therefore, we posit that flatter HAPG crystals, with their high reflectivity and improved resolving power, are a powerful tool for hard x-ray scattering and emission experiments allowing unprecedented measurements of collective scattering in a single shot.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC02-76SF00515; AC52-07NA27344
OSTI ID:
1769411
Alternate ID(s):
OSTI ID: 1890803
Report Number(s):
LLNL-JRNL-820062; TRN: US2206751
Journal Information:
Journal of Instrumentation, Vol. 15, Issue 11; ISSN 1748-0221
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

47 OTHER INSTRUMENTATION
Plasma diagnostics
Spectrometers
X-ray detectors