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Ultra-thin optical grade scCVD diamond as X-ray beam position monitor

Abstract : Results of measurements made at the SIRIUS beamline of the SOLEIL synchrotron for a new X-ray beam position monitor based on a super-thin single crystal of diamond grown by chemical vapor deposition (CVD) are presented. This detector is a quadrant electrode design processed on a 3 µm-thick membrane obtained by argon-oxygen plasma etching the central area of a CVD-grown diamond plate of 60 µm thickness. The membrane transmits more than 50% of the incident 1.3 keV energy X-ray beam. The diamond plate was of moderate purity (~1 p.p.m. nitrogen), but the X-ray beam induced current (XBIC) measurements nevertheless showed a photo-charge collection efficiency approaching 100% for an electric field of 2 V µm-1, corresponding to an applied bias voltage of only 6 V. XBIC mapping of the membrane showed an inhomogeneity of more than 10% across the membrane, corresponding to the measured variation in the thickness of the diamond plate before the plasma etching process. The measured XBIC signal-to-dark-current ratio of the device was greater than 105, and the X-ray beam position resolution of the device was better than a micrometer for a 1 kHz sampling rate.
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https://hal-cea.archives-ouvertes.fr/cea-01831921
Contributor : Marie-France Robbe <>
Submitted on : Friday, July 6, 2018 - 1:06:00 PM
Last modification on : Monday, February 10, 2020 - 6:14:10 PM

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Kewin Desjardins, Michal Pomorski, John Morse. Ultra-thin optical grade scCVD diamond as X-ray beam position monitor. Journal of Synchrotron Radiation, International Union of Crystallography, 2014, 21 (6), pp.1217 - 1223. ⟨10.1107/S1600577514016191⟩. ⟨cea-01831921⟩

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