Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17020s&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The Astro-E2 mission, a replacement of the original Astro-E observatory that was lost during launch, has been approved for launch in early 2005. The baseline plan for the new version of the high resolution x-ray spectrometer (XRS) is to fly a spare calorimeter array from the Astro-E program. Since the flight design of the first XRS became fixed, however, new fabrication techniques have become available and our understanding of these devices has increased. These factors present an opportunity to complete the optimization of this technology and, potentially, to increase the science-return of the new XRS instrument. We have reduced the excess noise in the implanted thermistors by increasing their thickness. Test devices have already demonstrated 8.4 9.5 eV resolution at 6 keV, (to be compared with the typical 10.5 12.5 eV resolution of the previous design). We are developing robust, closely packed, monolithic two-dimensional calorimeter arrays of optimized versions of such devices. Optimization factors include focal plane coverage and speed, as well as spectral resolution. We will present the current state of the development and the process for deciding which array will fly. The choice of the new array would require no changes in any other part of the instrument.
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