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Single crystal CVD diamond membranes as Position Sensitive X-ray Detector

K. Desjardins 1, * C. Menneglier 1 M. Pomorski 2
* Corresponding author
2 LCD-LIST - Laboratoire Capteurs Diamant
DM2I - Département Métrologie Instrumentation & Information : DRT/LIST/DM2I
Abstract : Transparent X-ray Beam Position Monitor (XBPM) has been specifically developed for low energy X-ray beamlines (1.4 keV < E < 5 keV) allowing to transmit more than 80% of 2 keV energy beam. The detector is based on a free-standing single crystal CVD diamond membrane of 4 μm thickness with position-sensitive DLC (Diamond-Like Carbon) resistive electrodes in duo-lateral configuration. The measured X-ray beam induced current (XBIC) due to the interaction of X-rays with diamond membrane allows precise monitoring of the absolute beam flux and the beam position (by the reconstruction of its center-of-gravity) at beam transmissions reaching 95%. This detector has been installed at SOLEIL synchrotron on the SIRIUS beamline monochromator output and it has shown charge collection efficiency (CCE) reaching 100% with no lag-effects and excellent beam intensity sensitivity monitoring. X-ray beam mapping of the detector showed an XBIC response inhomogeneity of less than 10% across the membrane, corresponding mainly to the measured variation of the diamond plate thickness. The measured beam position resolution is at sub-micron level depending on the beam flux and the readout electronics bandwidth.
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K. Desjardins, C. Menneglier, M. Pomorski. Single crystal CVD diamond membranes as Position Sensitive X-ray Detector. Journal of Instrumentation, IOP Publishing, 2017, 12, pp.C12046. ⟨10.1088/1748-0221/12/12/C12046⟩. ⟨cea-01830786⟩

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