Preliminary investigations were carried out to evaluate the resolution of Cd1-xZnxTe detectors at temperatures achievable with commercially available, low power Peltier refrigerators. Detectors were in the form of cubes, 2 mm on a side. They were tested using a preamplifier with optical feedback. The input FET was cooled along with the detectors. Resolutions of 409 eV and 326 eV were observed at the 5.9 keV line of Fe-55, at temperatures of -10 degree(s)C and -20 degree(s)C, respectively. Results indicate that a straightforward extension of this work will lead to resolutions well below 200 eV.
Heikki Sipila, Pekka Huttunen, Veikko Kamarainen, Osmi Vilhu, Jouko Kurki, Gilbert Leppelmeier, Ivor Taylor, Arto Niemela, Erik Laegsgaard, Rashid Sunyaev
The Silicon X-ray array, or 'SIXA' detector experiment will be carried by one of the 8-m focal length X-ray telescopes of the Spectrum-X-Gamma satellite. SIXA, which will measure X-ray spectra at good resolution simultaneously with the other X-ray telescope's gathering of images, uses 19 discrete, circular and closely packed Si(Li) detectors with an estimated resolution of 170-180 eV at 6 keV. The electronics of the SIXA instrument uses 19 parallel amplifier channels.
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