NSSDCA ID: 1990-049A-01
Mission Name: ROSATThe high resolution imager (HRI) was essentially a copy of the HRI provided for the HEAO 2 mission, modified to comply with the electrical and mechanical interfaces of ROSAT. Incoming X-ray photons were converted to electrons at a photocathode. The electrons were multiplied in a pair of cascaded microchannel plates (MCP) with a gain of about 100 million. A crossed grid at the exit of the MCP collected the electron cloud, thereby yielding a measurement of the location of the incoming photon with an positional accuracy of about 25 micrometers. A radioactive calibration source was attached to the retractable vacuum door in front of the HRI. For in-flight calibration, a UV source was integrated into the HRI.
Mass: 30.5 kg
Power (avg): 10.3 W
Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office
Name | Role | Original Affiliation | |
---|---|---|---|
Dr. John Gerdes | Experiment Manager | Smithsonian Astrophysical Observatory | |
Dr. Stephen S. Holt | Experiment Scientist | NASA Goddard Space Flight Center | holt@lheavx.gsfc.nasa.gov |
Dr. Frank R. Harnden, Jr. | Principal Investigator | Smithsonian Astrophysical Observatory | fjh@cfa.harvard.edu |