Radiation hardness of a p-channel notch CCD developed for the X-ray CCD camera onboard the XRISM satellite
astro-ph.IM
/ Authors
Yoshiaki Kanemaru, Jin Sato, Koji Mori, Hiroshi Nakajima, Yusuke Nishioka, Ayaki Takeda, Kiyoshi Hayashida, Hironori Matsumoto, Junichi Iwagaki, Koki Okazaki
and 23 more authors
Kazunori Asakura, Tomokage Yoneyama, Hiroyuki Uchida, Hiromichi Okon, Takaaki Tanaka, Takeshi G. Tsuru, Hiroshi Tomida, Takeo Shimoi, Takayoshi Kohmura, Kouichi Hagino, Hiroshi Murakami, Shogo B. Kobayashi, Makoto Yamauchi, Isamu Hatsukade, Masayoshi Nobukawa, Kumiko K. Nobukawa, Junko S. Hiraga, Hideki Uchiyama, Kazutaka Yamaoka, Masanobu Ozaki, Tadayasu Dotani, Hiroshi Tsunemi
/ Abstract
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 notch structure of potential for signal charges by increasing the implant concentration in the channel. The new device was exposed up to approximately $7.9 \times 10^{10} \mathrm{~protons~cm^{-2}}$ at 100 MeV. The charge transfer inefficiency was estimated as a function of proton fluence with an ${}^{55} \mathrm{Fe}$ source. A device without the notch structure was also examined for comparison. The result shows that the notch device has a significantly higher radiation hardness than those without the notch structure including the device adopted for Hitomi. This proves that the new CCD is radiation tolerant for space applications with a sufficient margin.