Abstract
Many X-ray experiments at third-generation synchrotrons benefit from using single-photon-counting detectors, due to their high signal-to-noise ratio and potential for high-speed measurements. LAMBDA (Large Area Medipix3-Based Detector Array) is a pixel detector system based on the Medipix3 readout chip. It combines the features of Medipix3, such as a small pixel size of 55 μm and flexible functionality, with a large tileable module design consisting of 12 chips (1536 × 512 pixels) and a high-speed readout system capable of running at 2000 frames per second.To enable high-speed experiments with hard X-rays, the LAMBDA systemhas been combined with different high-Z sensormaterials. Room-temperature systems using GaAs and CdTe systems havebeen produced and tested with X-ray tubes and at synchrotronbeamlines. Both detector materials show nonuniformities in their rawimage response, but the pixel yield is high and the uniformity can beimproved by flat-field correction, particularly in the case ofGaAs. High-frame-rate experiments show that useful information can begained on millisecond timescales in synchrotron experiments with thesesensors.
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