11 March 2003 Which part of the pixel is sensitive against the proton onto the CCD
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Abstract
The Chandra ACIS has seriously damaged by the low energy proton in orbit. Radiation hardness is an important characteristics of a device in space use. Therefore we applied the mesh experiment to a relatively low energy proton beam employing the CCD developed for the MAXI~(Monitor of All-sky X-ray Image) CCD camera named SSC that is scheduled to be onboard the International Space Station~(ISS) in 2005. It consists of 1024×1024 pixels with 24μm square. It is equipped with a `notch' structure in the middle of the pixel so that it is designed to be radiation hard. A mesh experiment is, so far, the only practical technique to study the CCD response with subpixel resolution. The mesh is made of gold with 10μm thick with many holes of 2μm in diameter. The proton beam is controlled so that the proton passing through the mesh hole can penetrate into the CCD chip with leaving damages near the buried channel inside.
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Junko Hiraga, Hiroshi Tsunemi, Emi Miyata, Hirohiko Kouno, Kazushisa Miyaguchi, Mitsunori Fukuda, Mototsugu Mihara, Kensaku Matsuta, Kanenobu Tanaka, Tadanori Minamisono, "Which part of the pixel is sensitive against the proton onto the CCD", Proc. SPIE 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, (11 March 2003); doi: 10.1117/12.461294; https://doi.org/10.1117/12.461294
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