skip to content
ASCA Guest Observer Facility

ASCA's Solid-state Imaging Spectrometers

The construction of ASCA's two Solid-state Imaging Spectrometers (SIS) was a joint effort of MIT, ISAS and Osaka University. Each SIS camera is based around four, 420x422 square pixel CCD chips, abutted side-by-side, front-side illuminated, operated in frame-store configuration.

The "vital statistics" of the SIS are as follows:

  • Energy Range: 0.4 keV to 10 keV keV
  • Energy Resolution: 2 percent at 5.9 keV
  • Field of View: 22 by 22 arcmin square
Effective area and energy resolution of SIS and GIS


Cross section of SIS (figure was taken from K.C.Gendreau's thesis).


Left:Four individual CCDs are combined in a single package to make a single SIS focal plane (figure was taken from K.C.Gendreau's thesis). Right:Configuration of the two SIS on the ASCA focal plane.

More SIS Information

Keith C. Gendreau's doctoral thesis (1995, MIT), "X-Ray CCD Calibration; X-Ray CCD Radiation Damage Evaluation and Modeling; Use of CCDs to Measure the Spectrum of the Cosmic X-Ray Backgrounds with ASCA"

If you have any questions concerning ASCA, visit our Feedback form.

This file was last modified on Tuesday, 19-Oct-2021 15:31:55 EDT

NASA Astrophysics

  • FAQ/Comments/Feedback
  • Education Resources
  • Download Adobe Acrobat
  • A service of the Astrophysics Science Division (ASD) at NASA/ GSFC

    ASCA Project Scientist: Dr. Nicholas E. White

    Responsible NASA Official: Dr. Andy Ptak

    Privacy Policy and Important Notices.