Fine-pitch CdTe detector for hard X-ray imaging and spectroscopy of the Sun with the FOXSI rocket experiment

Shin Nosuke Ishikawa; Miho Katsuragawa; Shin Watanabe; Yuusuke Uchida; Shin'ichiro Takeda; Tadayuki Takahashi; Shinya Saito; Lindsay Glesener; Juan Camilo Buitrago-Casas; Säm Krucker; Steven Christe

doi:10.1002/2016JA022631

Fine-pitch CdTe detector for hard X-ray imaging and spectroscopy of the Sun with the FOXSI rocket experiment

Shin Nosuke Ishikawa, Miho Katsuragawa, Shin Watanabe, Yuusuke Uchida, Shin'ichiro Takeda, Tadayuki Takahashi, Shinya Saito, Lindsay Glesener, Juan Camilo Buitrago-Casas, Säm Krucker, Steven Christe

Physics and Astronomy (Twin Cities)

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Abstract

We have developed a fine-pitch hard X-ray (HXR) detector using a cadmium telluride (CdTe) semiconductor for imaging and spectroscopy for the second launch of the Focusing Optics Solar X-ray Imager (FOXSI). FOXSI is a rocket experiment to perform high sensitivity HXR observations from 4 to 15 keV using the new technique of HXR focusing optics. The focal plane detector requires <100μm position resolution (to take advantage of the angular resolution of the optics) and ≈1 keV energy resolution (full width at half maximum (FWHM)) for spectroscopy down to 4 keV, with moderate cooling (>−30°C). Double-sided silicon strip detectors were used for the first FOXSI flight in 2012 to meet these criteria. To improve the detectors' efficiency (66% at 15 keV for the silicon detectors) and position resolution of 75 μm for the second launch, we fabricated double-sided CdTe strip detectors with a position resolution of 60 μm and almost 100% efficiency for the FOXSI energy range. The sensitive area is 7.67 mm × 7.67 mm, corresponding to the field of view of 791′′ × 791′′. An energy resolution of 1 keV (FWHM) and low-energy threshold of ≈4 keV were achieved in laboratory calibrations. The second launch of FOXSI was performed on 11 December 2014, and images from the Sun were successfully obtained with the CdTe detector. Therefore, we successfully demonstrated the detector concept and the usefulness of this technique for future HXR observations of the Sun.

Original language	English (US)
Pages (from-to)	6009-6016
Number of pages	8
Journal	Journal of Geophysical Research: Space Physics
Volume	121
Issue number	7
DOIs	https://doi.org/10.1002/2016JA022631
State	Published - Jul 1 2016

Bibliographical note

Funding Information:
This work was supported through KAKENHI grants 24244021, 20244017 and 24105007 from the Japan Society for the Promotion of Science. FOXSI was funded by NASA's LCAS program, grant NNX11AB75G. Hinode is a Japanese mission developed and launched by ISAS/JAXA, collaborating with NAOJ as a domestic partner, and NASA and STFC (UK) as international partners. Scientific operation of the Hinode mission is conducted by the Hinode science team organized at ISAS/JAXA. This team mainly consists of scientists from institutes in the partner countries. Support for the postlaunch operation is provided by JAXA and NAOJ (Japan), STFC (U.K.), NASA, ESA, and NSC (Norway). The authors will provide the data shown in this article to those who are interested. Please contact S.I.: [email protected].

Publisher Copyright:
©2016. American Geophysical Union. All Rights Reserved.

Keywords

Sun
X-ray
imaging spectroscopy
semiconductor detector
solar corona

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10.1002/2016JA022631

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Ishikawa, S. N., Katsuragawa, M., Watanabe, S., Uchida, Y., Takeda, S., Takahashi, T., Saito, S., Glesener, L., Buitrago-Casas, J. C., Krucker, S., & Christe, S. (2016). Fine-pitch CdTe detector for hard X-ray imaging and spectroscopy of the Sun with the FOXSI rocket experiment. Journal of Geophysical Research: Space Physics, 121(7), 6009-6016. https://doi.org/10.1002/2016JA022631

Ishikawa, SN, Katsuragawa, M, Watanabe, S, Uchida, Y, Takeda, S, Takahashi, T, Saito, S, Glesener, L, Buitrago-Casas, JC, Krucker, S & Christe, S 2016, 'Fine-pitch CdTe detector for hard X-ray imaging and spectroscopy of the Sun with the FOXSI rocket experiment', Journal of Geophysical Research: Space Physics, vol. 121, no. 7, pp. 6009-6016. https://doi.org/10.1002/2016JA022631

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title = "Fine-pitch CdTe detector for hard X-ray imaging and spectroscopy of the Sun with the FOXSI rocket experiment",

abstract = "We have developed a fine-pitch hard X-ray (HXR) detector using a cadmium telluride (CdTe) semiconductor for imaging and spectroscopy for the second launch of the Focusing Optics Solar X-ray Imager (FOXSI). FOXSI is a rocket experiment to perform high sensitivity HXR observations from 4 to 15 keV using the new technique of HXR focusing optics. The focal plane detector requires <100μm position resolution (to take advantage of the angular resolution of the optics) and ≈1 keV energy resolution (full width at half maximum (FWHM)) for spectroscopy down to 4 keV, with moderate cooling (>−30°C). Double-sided silicon strip detectors were used for the first FOXSI flight in 2012 to meet these criteria. To improve the detectors' efficiency (66% at 15 keV for the silicon detectors) and position resolution of 75 μm for the second launch, we fabricated double-sided CdTe strip detectors with a position resolution of 60 μm and almost 100% efficiency for the FOXSI energy range. The sensitive area is 7.67 mm × 7.67 mm, corresponding to the field of view of 791′′ × 791′′. An energy resolution of 1 keV (FWHM) and low-energy threshold of ≈4 keV were achieved in laboratory calibrations. The second launch of FOXSI was performed on 11 December 2014, and images from the Sun were successfully obtained with the CdTe detector. Therefore, we successfully demonstrated the detector concept and the usefulness of this technique for future HXR observations of the Sun.",

keywords = "Sun, X-ray, imaging spectroscopy, semiconductor detector, solar corona",

author = "Ishikawa, {Shin Nosuke} and Miho Katsuragawa and Shin Watanabe and Yuusuke Uchida and Shin'ichiro Takeda and Tadayuki Takahashi and Shinya Saito and Lindsay Glesener and Buitrago-Casas, {Juan Camilo} and S{\"a}m Krucker and Steven Christe",

note = "Funding Information: This work was supported through KAKENHI grants 24244021, 20244017 and 24105007 from the Japan Society for the Promotion of Science. FOXSI was funded by NASA's LCAS program, grant NNX11AB75G. Hinode is a Japanese mission developed and launched by ISAS/JAXA, collaborating with NAOJ as a domestic partner, and NASA and STFC (UK) as international partners. Scientific operation of the Hinode mission is conducted by the Hinode science team organized at ISAS/JAXA. This team mainly consists of scientists from institutes in the partner countries. Support for the postlaunch operation is provided by JAXA and NAOJ (Japan), STFC (U.K.), NASA, ESA, and NSC (Norway). The authors will provide the data shown in this article to those who are interested. Please contact S.I.: [email protected]. Publisher Copyright: {\textcopyright}2016. American Geophysical Union. All Rights Reserved.",

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AU - Ishikawa, Shin Nosuke

AU - Katsuragawa, Miho

AU - Watanabe, Shin

AU - Uchida, Yuusuke

AU - Takeda, Shin'ichiro

AU - Takahashi, Tadayuki

AU - Saito, Shinya

AU - Glesener, Lindsay

AU - Buitrago-Casas, Juan Camilo

AU - Krucker, Säm

AU - Christe, Steven

N1 - Funding Information: This work was supported through KAKENHI grants 24244021, 20244017 and 24105007 from the Japan Society for the Promotion of Science. FOXSI was funded by NASA's LCAS program, grant NNX11AB75G. Hinode is a Japanese mission developed and launched by ISAS/JAXA, collaborating with NAOJ as a domestic partner, and NASA and STFC (UK) as international partners. Scientific operation of the Hinode mission is conducted by the Hinode science team organized at ISAS/JAXA. This team mainly consists of scientists from institutes in the partner countries. Support for the postlaunch operation is provided by JAXA and NAOJ (Japan), STFC (U.K.), NASA, ESA, and NSC (Norway). The authors will provide the data shown in this article to those who are interested. Please contact S.I.: [email protected]. Publisher Copyright: ©2016. American Geophysical Union. All Rights Reserved.

PY - 2016/7/1

Y1 - 2016/7/1

N2 - We have developed a fine-pitch hard X-ray (HXR) detector using a cadmium telluride (CdTe) semiconductor for imaging and spectroscopy for the second launch of the Focusing Optics Solar X-ray Imager (FOXSI). FOXSI is a rocket experiment to perform high sensitivity HXR observations from 4 to 15 keV using the new technique of HXR focusing optics. The focal plane detector requires <100μm position resolution (to take advantage of the angular resolution of the optics) and ≈1 keV energy resolution (full width at half maximum (FWHM)) for spectroscopy down to 4 keV, with moderate cooling (>−30°C). Double-sided silicon strip detectors were used for the first FOXSI flight in 2012 to meet these criteria. To improve the detectors' efficiency (66% at 15 keV for the silicon detectors) and position resolution of 75 μm for the second launch, we fabricated double-sided CdTe strip detectors with a position resolution of 60 μm and almost 100% efficiency for the FOXSI energy range. The sensitive area is 7.67 mm × 7.67 mm, corresponding to the field of view of 791′′ × 791′′. An energy resolution of 1 keV (FWHM) and low-energy threshold of ≈4 keV were achieved in laboratory calibrations. The second launch of FOXSI was performed on 11 December 2014, and images from the Sun were successfully obtained with the CdTe detector. Therefore, we successfully demonstrated the detector concept and the usefulness of this technique for future HXR observations of the Sun.

AB - We have developed a fine-pitch hard X-ray (HXR) detector using a cadmium telluride (CdTe) semiconductor for imaging and spectroscopy for the second launch of the Focusing Optics Solar X-ray Imager (FOXSI). FOXSI is a rocket experiment to perform high sensitivity HXR observations from 4 to 15 keV using the new technique of HXR focusing optics. The focal plane detector requires <100μm position resolution (to take advantage of the angular resolution of the optics) and ≈1 keV energy resolution (full width at half maximum (FWHM)) for spectroscopy down to 4 keV, with moderate cooling (>−30°C). Double-sided silicon strip detectors were used for the first FOXSI flight in 2012 to meet these criteria. To improve the detectors' efficiency (66% at 15 keV for the silicon detectors) and position resolution of 75 μm for the second launch, we fabricated double-sided CdTe strip detectors with a position resolution of 60 μm and almost 100% efficiency for the FOXSI energy range. The sensitive area is 7.67 mm × 7.67 mm, corresponding to the field of view of 791′′ × 791′′. An energy resolution of 1 keV (FWHM) and low-energy threshold of ≈4 keV were achieved in laboratory calibrations. The second launch of FOXSI was performed on 11 December 2014, and images from the Sun were successfully obtained with the CdTe detector. Therefore, we successfully demonstrated the detector concept and the usefulness of this technique for future HXR observations of the Sun.

KW - Sun

KW - X-ray

KW - imaging spectroscopy

KW - semiconductor detector

KW - solar corona

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Fine-pitch CdTe detector for hard X-ray imaging and spectroscopy of the Sun with the FOXSI rocket experiment

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