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The Gas Imaging Spectrometer on Board ASCA
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1996
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EngineeringSpectrochemical AnalysisX-ray ImagingAnalytical InstrumentationOptical DiagnosticsCalibrationComputational ImagingInstrumentationRadiation ImagingRadiologyHealth SciencesGas Imaging SpectrometerRadiation DetectionImaging SpectroscopyBackground Rejection EfficiencyRadiometryInstrument ScienceSpectroscopyMass SpectrometryBoard AscaImaging
The Gas Imaging Spectrometer (GIS) system on board ASCA is described. The experiment consists of 2 units of imaging gas scintillation proportional counters with a sealed-off gas cell equipped with an imaging phototube. The performance is characterized by the high X-ray sensitivity (from 0.7 keV to over 10 keV), good energy resolution (7.8% FWHM at 6 keV following E−0.5 as a function of X-ray energy E), moderate position resolution (0.5 mm FWHM at 6 keV with E−0.5 dependence), fast time resolution down to 61 μs, and an effective area of 50 mm diameter. The on-board signal processing system and the data transmitted to the ground are also described. The background rejection efficiency of the GIS is reaching the level achieved by the non-imaging multi-cell proportional counters.