ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
An x-ray area detector based on charged coupled device (CCD) readout has been designed and constructed for diffraction studies. Incident x-rays are converted to visible photons by a phosphor screen [Y2O2S or CsI(Na)] which is attached via fiber optic to the input surface of the demagnifying image intensifier with a 4:1 demagnification. The intensified visible image created on the output phosphor screen of the image intensifier is viewed through a 1:1 optical lens system by the cooled CCD (Thomson:THX31156) which has 1024×1024 pixels (pixel size: 19 μm×19 μm). The detector system should have the following characteristics: active area: 100 mm in diameter, spatial resolution: 0.1 mm×0.1 mm, detective quantum efficiency (DQE): about 70% for 8 keV, dynamic range: more than 104, readout time: 4 s. Nonuniformity of response due to the image intensifier is corrected by software. The CCD is cooled to −30° to −40° to reduce the dark current. The background noise level of the detector system corresponds to less than 10 x-ray photons per pixel. Detailed hardware and software configuration and measured performance of the system will be described. The system will be applied to small-angle x-ray scattering (SAXS) and protein crystallography.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1142682
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