15 July 2008 Instrumental background of the x-ray CCD camera in space: its dependence on the configuration parameters of CCD
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Abstract
We studied how the configuration parameters of a CCD (pixel size and depletion layer thickness) affect the instrumental background of an X-ray CCD camera in the space environment through the Monte-Carlo simulation. X-ray detectors are in general sensitive not only to X-rays but also to charged particles. The latter produce pseudo-signal indistinguishable from that of X-rays, which is called instrumental background. It is essential to reduce the instrumental background for the observations of dim and diffuse X-ray sources, but the low background was not considered as a design goal of an X-ray CCD camera so far. We utilized the Monte-Carlo simulator, which could successfully reproduce the Suzaku XIS background, for the current analysis. We found that thicker depletion layer tends to increase the background except for the >5 keV band of the backside-illuminated CCD. On the other hand, pixel-size dependence was different between the frontside and backside illuminated CCDs. These results are interpreted in terms of the interaction of cosmic/X-rays with the CCD.
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Takayasu Anada, Takayasu Anada, Tadayasu Dotani, Tadayasu Dotani, Masanobu Ozaki, Masanobu Ozaki, Hiroshi Murakami, Hiroshi Murakami, } "Instrumental background of the x-ray CCD camera in space: its dependence on the configuration parameters of CCD", Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70113X (15 July 2008); doi: 10.1117/12.788138; https://doi.org/10.1117/12.788138
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