Soft X-ray Imager aboard Hitomi (ASTRO-H)
Takaaki Tanaka, Hiroyuki Uchida, Hiroshi Nakajima, Hiroshi Tsunemi,, Kiyoshi Hayashida, Takeshi G. Tsuru, Tadayasu Dotani, Ryo Nagino, Shota, Inoue, Shohei Katada, Ryosaku Washino, Masanobu Ozaki, Hiroshi Tomida,, Chikara Natsukari, Shutaro Ueda, Masachika Iwai, Koji Mori

TL;DR
The paper describes the design, testing, and performance verification of the Soft X-ray Imager (SXI) on the Hitomi observatory, highlighting its capabilities, challenges, and solutions for X-ray astronomy.
Contribution
It introduces the SXI instrument's design, performance verification methods, and solutions for issues like charge transfer inefficiency and optical light blocking.
Findings
Energy resolution of 161-170 eV at 5.9 keV
Identification of position-dependent CTI issues and developed correction methods
Increased Al coating thickness to block optical light effectively
Abstract
The Soft X-ray Imager (SXI) is an imaging spectrometer using charge-coupled devices (CCDs) aboard the Hitomi X-ray observatory. The SXI sensor has four CCDs with an imaging area size of arranged in a array. Combined with the X-ray mirror, the Soft X-ray Telescope, the SXI detects X-rays between and and covers a field-of-view. The CCDs are P-channel fully-depleted, back-illumination type with a depletion layer thickness of . Low operation temperature down to as well as charge injection is employed to reduce the charge transfer inefficiency of the CCDs. The functionality and performance of the SXI are verified in on-ground tests. The energy resolution measured is - in full width at half maximum for X-rays. In…
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