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High Bragg reflectivity of diamond crystals exposed to multi-kW mm–2 X-ray beams

Journal Article · · Journal of Synchrotron Radiation (Online)
 [1];  [2];  [2];  [2];  [3];  [2];  [4];  [2];  [2];  [2];  [2];  [2];  [5];  [5];  [2];  [6];  [6];  [2]
  1. Argonne National Lab. (ANL), Lemont, IL (United States); AGH Univ. of Science and Technology, Krakow (Poland)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
  3. Cornell Univ., Ithaca, NY (United States)
  4. Argonne National Lab. (ANL), Lemont, IL (United States); Washington State Univ., Lemont, IL (United States)
  5. Advanced Photon Source, Lemont, IL (United States)
  6. Technological Institute for Superhard and Novel Carbon Materials, Troitsk (Russian Federation)

X-ray free-electron lasers in the oscillator configuration (XFELO) are future fully coherent hard X-rays sources with ultrahigh spectral purity. X-ray beams circulate in an XFELO optical cavity comprising diamond single crystals. They function as high-reflectance (close to 100%), narrowband (~10 meV) Bragg backscattering mirrors. The average power density of the X-ray beams in the XFELO cavity is predicted to be as high as ~10 kW mm–2. Therefore, XFELO feasibility relies on the ability of diamond crystals to withstand such a high radiation load and preserve their high reflectivity. Here the endurance of diamond crystals to irradiation with multi-kW mm–2 power density X-ray beams is studied. It is shown that the high Bragg reflectivity of the diamond crystals is preserved after the irradiation, provided it is performed at ~1 × 10–8 Torr high-vacuum conditions. In conclusion, irradiation under 4 × 10–6 Torr results in a ~1 meV shift of the Bragg peak, which corresponds to a relative lattice distortion of 4 × 10–8, while the high Bragg reflectivity stays intact.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1465532
Journal Information:
Journal of Synchrotron Radiation (Online), Journal Name: Journal of Synchrotron Radiation (Online) Journal Issue: 4 Vol. 25; ISSN 1600-5775; ISSN JSYRES
Publisher:
International Union of CrystallographyCopyright Statement
Country of Publication:
United States
Language:
English

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