Radiation hardness of a p-channel notch CCD developed for the X-ray CCD camera onboard the XRISM satellite
2019
We report the radiation hardness of a p-channel CCD developed for the X-ray CCD camera onboard the XRISM satellite. This CCD has basically the same characteristics as the one used in the previous Hitomi satellite, but newly employs a
notchstructure of potential for signal charges by increasing the implant concentration in the channel . The new device was exposed up to approximately 7.9 × 1010 protons cm−2 at 100 MeV . The charge transfer inefficiency was estimated as a function of proton fluence with an 55Fe source. A device without the
notchstructure was also examined for comparison. The result shows that the
notchdevice has a significantly higher radiation hardness than those without the
notchstructure including the device adopted for Hitomi. This proves that the new CCD is radiation tolerant for space applications with a sufficient margin.
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