22 September 2015 Proton-induced Random Telegraph Signal in the CMOS imaging sensor for JANUS, the visible imaging telescope on JUICE
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Abstract
JUpiter ICy moons Explorer (JUICE) is an ESA L class mission due for launch in 2022 as part of the agency’s Cosmic Vision program [1][2]. The primary science goal is to explore and characterise Jupiter and several of its potentially habitable icy moons, particularly Ganymede, Europa and Callisto.

The JANUS instrument is designated to be the scientific imager on-board the spacecraft with a wavelength range between 400 nm and 1000 nm and consists of a catoptric telescope coupled to a CMOS detector [3], specifically the CIS115 monolithic active pixel sensor supplied by e2v technologies[3]. A CMOS sensor has been chosen due to a combination of the high radiation tolerance required for all systems aboard the spacecraft and its capability of operating with integration times as low as 1 ms, which is required to prevent blur when imaging the moons at fast ground velocities since the camera has no mechanical shutter. However, an important consideration of using CMOS in high radiation environments is the generation of defects or defect clusters that result in pixels exhibiting Random Telegraph Signal (RTS)[5].

A study of RTS effects in the CIS115 has been undertaken, and the method applied to identify pixels in the array that display RTS behaviour is discussed and individual RTS-exhibiting pixels are characterised. The changes observed in RTS behaviour following irradiation of the CIS115 with protons is presented and the temperature dependence of the RTS behaviour is studied. The implications on the camera design and imaging requirements of the mission are examined.
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G. P. Winstone, G. P. Winstone, M. R. Soman, M. R. Soman, E. A. H. Allanwood, E. A. H. Allanwood, A. D. Holland, A. D. Holland, J. P. D. Gow, J. P. D. Gow, K. Stefanov, K. Stefanov, M. Leese, M. Leese, } "Proton-induced Random Telegraph Signal in the CMOS imaging sensor for JANUS, the visible imaging telescope on JUICE", Proc. SPIE 9602, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VII, 96020N (22 September 2015); doi: 10.1117/12.2187011; https://doi.org/10.1117/12.2187011
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