Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 84, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4824350
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Funding
- U S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- U.S. Department of Energy, Office of Science, Office of High Energy Physics [DE-FG02-12ER41837]
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Diamond sensors are evaluated as incident beam monitors for X-ray absorption spectroscopy experiments. These single crystal devices pose a challenge for an energy-scanning experiment using hard X-rays due to the effect of diffraction from the crystalline sensor at energies which meet the Bragg condition. This problem is eliminated by combination with polycapillary lenses. The convergence angle of the beam exiting the lens is large compared to rocking curve widths of the diamond. A ray exiting one capillary from the lens meets the Bragg condition for any reflection at a different energy from the rays exiting adjacent capillaries. This serves to broaden each diffraction peak over a wide energy range, allowing linear measurement of incident intensity over the range of the energy scan. Extended X-ray absorption fine structure data are measured with a combination of a polycapillary lens and a diamond incident beam monitor. These data are of comparable quality to data measured without a lens and with an ionization chamber monitoring the incident beam intensity. (C) 2013 AIP Publishing LLC.
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