Measurements and simulations of X-ray quantum efficiency and energy resolution of large area CCDs between 0.3 and 10 keV

Computer Science – Performance

Scientific paper

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Charge Coupled Devices, Performance Prediction, Quantum Efficiency, X Rays, Absorptivity, Pixels, Radiation Shielding, Test Facilities

Scientific paper

Large area CCD arrays, 770 x 1024 pixels, with 27 micron-square pixels and packaged in matching pairs in a ruggedized focal plane assembly, have been developed for the JET-X instrument for the Russian Spectrum-RG spacecraft. The devices achieve low noise readout (less than 5 electrons rms), low dark current (less than 1 electron/pixel/frame-integration time) and high charge transfer efficiency (above 0.99997), enabling the device to combine high quantum efficiency and good energy resolution over the operating range of JET-X. New results from flight prototype JET-X CCDs are presented which reveal the detail of charge spreading behavior in the device and the consequent effect on quantum efficiency, energy resolution and background rejection.

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