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Cornell Stanford Pixel Array Detector (CSPAD) is an imaging X-ray detector made of silicon sensors (2x1) covering about 20x20cm² surface, as shown in the plot:

Although pixel Pixel coordinates in 2x1 sensor chip are known with sub-micrometer precision, construction . Construction of the detector allows significant freedom in relative positions of 2x1 sensors. To get precise measurement pixel positions in the detector the 2x1 sensor coordinates needs to be calibrated. In this note we describe geometry of the CSPAD detector, optical and quad alignment procedure, parameters, and software providing access to precise geometry information.

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