Mori, KojiTomida, HiroshiNakajima, HiroshiOkajima, TakashiNoda, HirofumiUchida, HiroyukiSuzuki, HiromasaKobayashi, Shogo BenjaminYoneyama, TomokageHagino, KouichiNobukawa, KumikoTanaka, TakaakiMurakami, HiroshiUchiyama, HidekiNobukawa, MasayoshiMatsumoto, HironoriTsuru, TakeshiYamauchi, MakotoHatsukade, IsamuOdaka, HirokazuKohmura, TakayoshiYamaoka, KazutakaIshida, ManabuMaeda, YoshitomoHayashi, TakayukiTamura, KeisukeBoissay-Malaquin, RozennSato, ToshikiYoshida, TesseiKanemaru, YoshiakiHiraga, JunkoDotani, TadayasuOzaki, MasanobuTsunemi, HiroshiInoue, ShunAzuma, RyuishiAoki, YumaAsahina, YohNakamura, ShotaroKamei, TakamitsuFukuda, MasahiroAsakura, KazunoriYoshimoto, MarinaOde, YuichiHakamata, TomohiroAoyagi, Mioshima, KoheiAoki, YumaIto, YamatoAoki, DaikiFujisawa, KaitoShimizu, YasuyukiHiguchi, MayuMiyazaki, KeitaroKusunoki, KoheiOtsuka, YoshinoriYokosu, HaruhikoYonemaru, WakanaIchikawa, KazuhiroNakano, Hanakotakemoto, ReoMatsushima, TsukasaHayashida, Kiyoshi2024-07-262024-07-262024-06-28https://doi.org/10.48550/arXiv.2406.19911http://hdl.handle.net/11603/34992Proceedings of SPIE Astronomical Telescopes and Instrumentation 2024, 16 - 21 June 2024, Yokohama, JapanXtend is one of the two telescopes onboard the X-ray imaging and spectroscopy mission (XRISM), which was launched on September 7th, 2023. Xtend comprises the Soft X-ray Imager (SXI), an X-ray CCD camera, and the X-ray Mirror Assembly (XMA), a thin-foil-nested conically approximated Wolter-I optics. A large field of view of 38′ × 38′ over the energy range from 0.4 to 13 keV is realized by the combination of the SXI and XMA with a focal length of 5.6 m. The SXI employs four P-channel, back-illuminated type CCDs with a thick depletion layer of 200 µm. The four CCD chips are arranged in a 2×2 grid and cooled down to −110 ◦C with a single-stage Stirling cooler. Before the launch of XRISM, we conducted a month-long spacecraft thermal vacuum test. The performance verification of the SXI was successfully carried out in a course of multiple thermal cycles of the spacecraft. About a month after the launch of XRISM, the SXI was carefully activated and the soundness of its functionality was checked by a step-by-step process. Commissioning observations followed the initial operation. We here present pre- and post-launch results verifying the Xtend performance. All the in-orbit performances are consistent with those measured on ground and satisfy the mission requirement. Extensive calibration studies are ongoing.10 pagesen-USThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.Public Domainhttps://creativecommons.org/publicdomain/mark/1.0/Astrophysics - Instrumentation and Methods for AstrophysicsText