Radiation study of swept-charge devices for the Chandrayaan-1 X-ray Spectrometer (C1XS) instrument

Gow, J.; Smith, D. R.; Holland, A. D.; Madison, B.; Howe, C.; Grande, M.; Sreekumar, P. and Huovelin, J. (2008). Radiation study of swept-charge devices for the Chandrayaan-1 X-ray Spectrometer (C1XS) instrument. In: Proceedings of SPIE: High Energy, Optical, and Infrared Detectors for Astronomy III, 23-27 Jun 2008, Marseille.

DOI: https://doi.org/10.1117/12.791732

Abstract

The Chandrayaan-1 X-ray Spectrometer (C1XS) will be launched as part of the Indian Space Research Organisation (ISRO) Chandrayaan-1 payload in September 2008, arriving at the Moon within 7 days to begin a two year mission in lunar orbit conducting mineralogical surface mapping over the range of 1 - 10 keV. The detector plane of the instrument consists of twenty four e2v technologies CCD54 swept-charge devices (SCDs). Such devices were first flown in the Demonstration of a Compact Imaging X-ray Spectrometer (D-CIXS) instrument onboard SMART-1 [4, 5]. The detector plane in each case provides a total X-ray collection area of 26.4 cm2. The SCD is capable of providing near Fano-limited spectroscopy at -10°C, and at -20°C, near the Chandrayaan-1 mission average temperature, it achieves a total system noise of 6.2 electrons r.m.s. and a FWHM of 134 eV at Mn-K. This paper presents a brief overview of the C1XS mission and a detailed study of the effects of proton irradiation on SCD operational performance.

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