Design criteria and development of components for a modular CCD-based detector for x-ray crystallography

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Abstract
X-ray detector systems for protein crystallographic applications require a large active area and a high detective quantum efficiency (DQE). Using large-format scientific CCDs we are developing a detector based on multiple modules each consisting of a fiberoptic taper with a phosphor x-ray converter deposited on the large end and a CCD coupled to the small end. This approach contrasts with the more typical method of imaging a large area onto a single sensor which requires intensification stages. This system will provide a greater DQE lower spatial and response nonuniformities a smaller package size higher spatial resolution and uniformity and greater reliability. The construction of this system has necessitated development and cha racterization of x-ray-tolight phosphor converters and techniques for coupling fiberoptics to COD imagers. Refinement of phosphor deposition and reflective enhancement methods has led to an increase in phosphor conversion efficiencies over our previous methods of -80. A system to epoxy bond fiberoptic tapers to both front and back illuminated COD imagers with precise control over positioning and clamp force has been developed and tested with fiber faceplates. 1.

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