Further Development Of CCD X-Ray Detectors For Astronomy

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Abstract
A number of future space-borne X-ray astronomy missions have now been proposed, which will utilise CCD imaging devices in their focal planes. The CCDs will offer simultaneously high spatial resolution, excellent energy resolution and detection sensitivity. However, a number of technological developments are still to be demonstrated before the X-ray performance of CCDs is optimised. The development of CCDs fabricated on high resistivity silicon wafers, combined with back thinning and annealing processes, allows the production of fully depleted detectors. These devices are capable of detecting single X-ray photons , with high efficiency throughout the 0.1-15keV energy band. Efficient coverage of focal planes is facilitated with the introduction of new large area CCDs. The EEV P88000 series CCDs have a range of formats up to 1242 x 1152 pixels (6.5 sq cm), and have included process changes to optimise noise (5.5 electrons rms) and dark current. Results of a programme to investigate the tolerance of EEV CCDs to ionising radiation are also presented.© (1989) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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