Mr. Naoki Yokomizo Profile

Naoki Yokomizo

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Proceedings Article | 21 August 2024 Poster + Paper

Development of soft x-ray CMOS camera for the GEO-X mission

Yuki Satoh, Hiroshi Nakajima, Shoei Yamanoi, Naoki Yokomizo, Junko Hiraga, Koichi Hagino, Yuichiro Ezoe, Daiki Ishi, Masaki Numazawa

Proceedings Volume 13093, 130935Q (2024) https://doi.org/10.1117/12.3018816

KEYWORDS: X-rays, CMOS sensors, X-ray imaging, Satellites, Imaging spectroscopy

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We are developing a complementary metal oxide semiconductor (CMOS) camera to be onboard GEO-X (GEOspace X-ray imager) microsatellite. The GEO-X mission observes soft X-rays produced by Solar Wind Charge eXchange (SWCX), in which ions in the solar wind collide with atoms in the Earth’s exosphere and steal electrons, to visualize the day-side magnetospheric boundary. The payload of the satellite is approximately 3U (∼ L 10 cm ×W 10 cm × H 30 cm) in size and approximately 10 kg in mass and consists of the X-ray telescope and a focal plane detector. A back-side illuminated CMOS sensor is placed on the focal plane of the X-ray telescope, and the optical blocking filter is used for high-sensitivity imaging spectroscopy of X-rays from 0.3−2.0 keV. The design and fabrication of the printed circuit boards for housekeeping data collection and the housing assembly are also ongoing. We implement our own on-board event extraction logic to achieve data acquisition at 48 fps without any data loss. In addition, we performed functional testing of a digital processing board using SoC (Zynq) and its radiation tolerance investigation and found that the pedestal level is stable even when irradiated Zynq with 100 MeV/u protons. Furthermore, we irradiated the sensor cooled to −35 °C with polychromatic X-rays of 0.5 − 7.0 keV to evaluate the spectral performance of the sensor. The energy resolution is found to be 120 eV (FWHM) at 0.6 keV and the lower edge of the effective energy range is below 300 eV.

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