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ASCA BWASCA's Gas Imaging Spectrometers

ASCA's two Gas Imaging Spectrometers (GIS) were built by scientists and engineers at Tokyo University. The GIS, an imaging gas scintillation proportional counter, has two main parts: the gas cell, and the photon- sensitive phototube.

The gas cell is filled with a mixture of xenon (90 percent) and helium (10 percent). The cell has a front window made of beryllium (10 microns thick). The voltage across the gass cell is 8000 V.

The phototube was made by scientists and engineers at Hamamatsu Photonics. It has a quartz window (7.5 cm thick) and ten-stage dynodes.

The area of the GIS that is sensitive to X-rays is 50 mm in diameter. Other "vital statistics" of the GIS are as follows:

  • Energy Range : 0.7 keV to 10 keV
  • Energy Resolution: 8 percent at 5.9 keV
  • Field of View: circular, with a diameter of 50 arcmin
Effective area and energy resolution of GIS and SIS


More GIS Information

  • Further information of the GIS instrument can be obtained from the ASCA GIS page at HEASARC.

References:
Ohashi, T. et al. 1996, "The Gas Imaging Spectrometer on Board ASCA", PASJ, 48, 157
Makishima, K. et al. 1996, "In-Orbit Performance of the Gas Imaging Spectrometer onboard ASCA ", PASJ, 48, 171
Yasushi Ikebe's doctoral thesis (1995, Univ of Tokyo), "X-ray Measurements of Mass Distribution in Clusters of Galaxies"
Tashiro, M. et al. 1995, "In-orbit performance of the GIS instrument on-board ASCA (Astro-D)", SPIE, 2518, 2
Kohmura, Y. et al. 1993, "Calibration of imaging gas scintillation proportional counters on Astro-D", SPIE, 2006, 78
Ohashi, T. et al. 1991, "Imaging gas scintillation proportional counters for Astro-D", SPIE, 1549, 9

 
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