Optical blocking performance of CCDs developed for the X-ray Astronomy Satellite XRISM

Uchida, Hiroyuki; Tanaka, Takaaki; Amano, Yoshiharu; Okon, Hiromichi; Tsuru, Takeshi Go; Nakajima, Hiroshi; Noda, Hirofumi; Hayashida, Kentaro; Matsumoto, Hironori; Hanaoka, Maho; Yoneyama, T.; Okazaki, Koki; Asakura, Kiyotaka; Sakuma, Shotaro; Hattori, Koichi; Ishikura, Ayami; Saito, Mariko; Nobukawa, Kumiko K.; Tomida, H.; Kanemaru, Yoshiaki; Sato, Jin; Takaki, Toshiyuki; Terada, Yuta; Mori, Koji; Kashimura, Hikari; Kohmura, Takayoshi; Hagino, K.; Murakami, Hiroshi; Kobayashi, Shōgo; Nishioka, Yusuke; Yamauchi, M.; Hatsukade, Isamu; Sako, T.; Nobukawa, Masayoshi; Urabe, Yukino; Hiraga, Junko S.; Uchiyama, Hideki; Yamaoka, K.; Dotani, Tadayasu; Tsunemi, H.; Suzuki, H.; Takagi, Shin ichiro; Sugimoto, Kenichi; Atsumi, Sho; Tanaka, Fumiya

doi:10.1016/j.nima.2020.164374

Cited by 7 publications

(3 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6 One is to add another aluminum layer on the top of the originally existing aluminum layer, resulting in a 100 nm + 100 nm thick aluminum coat, and to insert an extra aluminum layer under the electrode layer for the sake of the secure reduction of visible and infrared light leaks. 20 The other is to employ a notch structure, which is a narrow implant in the CCD channel confining a charge packet to a fraction of the pixel volume to reduce the charge transfer inefficiency (CTI). 21 We also changed the screening criteria of flight candidate CCDs before shipment from the manufacturer 22 and successfully excluded ones with the CTI anomaly observed in the Hitomi CCDs.…”

Section: Xtend Overviewmentioning

confidence: 99%

See 1 more Smart Citation

Xtend, the soft x-ray imaging telescope for the x-ray imaging and spectroscopy mission (XRISM)

Mori

Tomida

Nakajima

et al. 2022

Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray

Self Cite

View full text Add to dashboard Cite

Xtend is a soft X-ray imaging telescope developed for the X-Ray Imaging and Spectroscopy Mission (XRISM). XRISM is scheduled to be launched in the Japanese fiscal year 2022. Xtend consists of 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. The SXI uses the P-channel, back-illuminated type CCD with an imaging area size of 31 mm on a side. The four CCD chips are arranged in a 2×2 grid and can be cooled down to −120 • C with a single-stage Stirling cooler. The XMA nests thin aluminum foils coated with gold in a confocal way with an outer diameter of 45 cm. A pre-collimator is installed in front of the X-ray mirror for the reduction of the stray light. Combining the SXI and XMA with a focal length of 5.6m, a field of view of 38 × 38 over the energy range from 0.4 to 13 keV is realized. We have completed the fabrication of the flight model of both SXI and XMA. The performance verification has been successfully conducted in a series of sub-system level tests. We also carried out on-ground calibration measurements and the data analysis is ongoing.

show abstract

Section: Xtend Overviewmentioning

confidence: 99%

“…14 Although the reason of the degradation was not clear, the Hitomi spectrum might have been partly affected by a light leak issue, which we took multiple measures in XRISM/Xtend. 4,26 Fig. 7 shows the Xtend spectrum of the quasar 3C 273.…”

Section: Performances In Orbitmentioning

confidence: 99%

Xtend, the soft x-ray imaging telescope for the x-ray imaging and spectroscopy mission (XRISM)

Mori

Tomida

Nakajima

et al. 2022

Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray

Self Cite

View full text Add to dashboard Cite

show abstract

“…The basic design of the CCD camera is identical to that of the Hitomi SXI, and some improvements are adopted on the CCD chip and the scheme for preventing light leakage. The development and on-ground calibration status are reported in [26][27][28][29].…”

Section: Development Status Of Science Instrumentsmentioning

confidence: 99%

Status of x-ray imaging and spectroscopy mission (XRISM)

Tashiro

Maejima

Toda

et al. 2020

Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray

Self Cite

View full text Add to dashboard Cite

The X-Ray Imaging and Spectroscopy Mission (XRISM) is the successor to the 2016 Hitomi mission that ended prematurely. Like Hitomi, the primary science goals are to examine astrophysical problems with precise highresolution X-ray spectroscopy. XRISM promises to discover new horizons in X-ray astronomy. XRISM carries a 6 x 6 pixelized X-ray micro-calorimeter on the focal plane of an X-ray mirror assembly and a co-aligned X-ray CCD camera that covers the same energy band over a large field of view. XRISM utilizes Hitomi heritage, but all designs were reviewed. The attitude and orbit control system were improved in hardware and software. The number of star sensors were increased from two to three to improve coverage and robustness in onboard attitude determination and to obtain a wider field of view sun sensor. The fault detection, isolation, and reconfiguration (FDIR) system was carefully examined and reconfigured. Together with a planned increase of ground support stations, the survivability of the spacecraft is significantly improved.

show abstract

Experimental studies on the charge transfer inefficiency of CCD developed for the soft X-ray imaging telescope Xtend aboard the XRISM satellite

Kanemaru

Sato

Takaki

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

Optical blocking performance of CCDs developed for the X-ray Astronomy Satellite XRISM

Cited by 7 publications

References 14 publications

Xtend, the soft x-ray imaging telescope for the x-ray imaging and spectroscopy mission (XRISM)

Xtend, the soft x-ray imaging telescope for the x-ray imaging and spectroscopy mission (XRISM)

Status of x-ray imaging and spectroscopy mission (XRISM)

Experimental studies on the charge transfer inefficiency of CCD developed for the soft X-ray imaging telescope Xtend aboard the XRISM satellite

Contact Info

Product

Resources

About