Cooled CdZnTe detectors for X-ray astronomy

Details Cooled CdZnTe detectors for X-ray astronomy Cooled CdZnTe detectors for X-ray astronomy

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nimpa.436..150b&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 436, Issue 1-2, p. 150-154.

Physics

8

Scientific paper

Recent results combining thermoelectrically cooled CdZnTe detectors with a low-noise Pentafet preamplifier are presented. Cooling between -30°C and -40°C reduces the leakage current of the detectors and allows the use of a pulsed reset preamplifier and long shaping times, significantly improving the energy resolution. Mn Kα X-rays at 5.9keV have been observed with a resolution of less than 280eV FWHM and a peak to background of more than 200:1. The Fano factor of the material has been estimated at 0.11+/-0.012 at -40°C. The detector requirement for X-ray astronomy will be a photon-counting imaging spectrometer. A 16×16 element, bump bonded pixel detector is described and results from a prototype silicon array presented. The detector is constructed with ASIC amplifiers with a system noise of <25 electrons rms and should give an energy resolution comparable to the Pentafet results presented here.

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