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Proceedings Paper

The SXI: CCD camera onboard the NeXT mission
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Paper Abstract

The Soft X-ray Imager (SXI) is the X-ray CCD camera on board the NeXT mission that is to be launched around 2013. We are going to employ the CCD chips developed at Hamamatsu Photonics, K.K. We have been developing two types of the CCD: an N-channel chip and a P-channel chip. The effective area of the detector system will be 5-6 cm square with a depletion layer of 100-200μm. The P-channel chip will have thicker depletion layer that makes it easy to develop it to back-illuminated type CCD. It will need a year or so for us to reach the final conclusion which type will be available. Based on the Suzaku experience, we will incorporate the charge injection gate so that we can reduce the proton damage. Furthermore, we will employ a mechanical cooler to keep the CCD working temperature down to -120°C in spite that NeXT will be in the low earth orbit. We can expect the radiation damage on our system very small. The CCD will have an Al coat on the chip to prevent optical photons from entering. This also eliminates the vacuum-tight chamber and the door-opening mechanism. We are planning to employ a custom-made analog ASIC that will reduce the power consumption and the size. The ASIC may speed up the frame-time if we can use a multi-node CCD. With using the focal length of 6m, the SXI will fully function with the optics around 20" resolution. We will report the current plan of the SXI in detail.

Paper Details

Date Published: 15 July 2008
PDF: 10 pages
Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70110Q (15 July 2008); doi: 10.1117/12.788132
Show Author Affiliations
Hiroshi Tsunemi, Osaka Univ. (Japan)
Takeshi Go Tsuru, Kyoto Univ. (Japan)
Tadayasu Dotani, Institute of Space and Aeronautical Science, Japan Aerospace Exploration Agency (Japan)
Kiyoshi Hayashida, Osaka Univ. (Japan)
Marshall W. Bautz, Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 7011:
Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray
Martin J. L. Turner; Kathryn A. Flanagan, Editor(s)

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