Computer Science – Performance
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........34w&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF CALIFORNIA, BERKELEY, 1994.Source: Dissertation Abstracts International, Volume: 55-09, Section: B
Computer Science
Performance
1
Xenon, Neutrinos
Scientific paper
Development of high sensitivity, high resolution hard X-ray detectors is important to improve scientific observations--especially astrophysical observations in the 30-300 keV energy range for hard X-rays. This thesis describes the operating principles, design, construction, and testing of a prototype gas scintillation drift chamber (GSDC). Focal points of this description include a general discussion of gas chamber operating principles with specific attention to the gas scintillation mechanisms; detailed description of the operation of our prototype GSDC, including a summary of performance results; and the development of an auto-calibration scheme to improve the energy resolution of our detector. This auto-calibration represents the principal original contributions to our GSDC research program and uses off-line analysis techniques to correct for channel -to-channel variations in signal intensity which introduce a spatial variation in energy measurements for a mono-energetic test source. The best energy resolution obtained using a xenon/helium (90/10) gas mixture at 15 atm and a reduced scintillation field of 1.67 kV/cm/atm is 8.1% FWHM at 60 keV. This figure is still short of the optimum value of 5.8% computed for these chamber conditions, but the auto -calibration introduces an improvement of roughly a factor of 2 for spectra which include events throughout the entire fiducial volume and is within 10% of the best energy resolution measured using extremely restrictive location cuts. Operation of this prototype has led to the design and construction of a hard X-ray telescope (SIGHT). This high-sensitivity telescope has excellent imaging characteristics and good energy resolution and should provide high quality astrophysical data on a variety of hard X-ray sources. Applications using the GSDC technology also include high-rate, low-background beta spectroscopy to look for evidence of massive neutrinos in beta decay and development of highly sensitive medical imaging detectors which would permit lower radiation doses for imaging patients.
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