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Proceedings Paper

Shielding simulations for the Advanced X-Ray Astrophysics Facility (AXAF)
Author(s): Kurtis L. Dietz; Ronald F. Elsner; Marshall K. Joy; Stephen L. O'Dell; Brian D. Ramsey; Martin C. Weisskopf; Anthony W. Armstrong; Bonnie L. Colborn; Nina Kanvec
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Paper Abstract

The Advanced X ray Astrophysics Facility (AXAF) contains two focal-plane science instruments -- the microchannel-plate high-resolution camera (HRC) and the AXAF CCD imaging spectrometer (ACIS). Each of these instruments provides two low-internal- background detectors, one for imaging and the other for reading out AXAF's objective transmission gratings. Taking maximum advantage of the low internal background of these instruments requires shielding against external electromagnetic and particle radiation. To optimize the shielding within weight constraints, we performed extensive numerical simulations of the photon transport and of the particle transport and activation within the AXAF. We discuss the simulations and report the results of the shielding study. With the adopted shielding design, the particle-induced background and the x-ray-induced background are each comparable to or less than the anticipated internal background of AXAF's imaging detectors (HRC and ACIS). Thus, the predicted total non-imaged background is very low -- less than 0.2 counts arcsec-2 day-1 for the HRC and even lower for the ACIS half-arcsec angular resolution, this low background has negligible effect upon point-source detection, for reasonable observation durations.

Paper Details

Date Published: 1 September 1995
PDF: 12 pages
Proc. SPIE 2518, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VI, (1 September 1995); doi: 10.1117/12.218409
Show Author Affiliations
Kurtis L. Dietz, NASA Marshall Space Flight Ctr. (United States)
Ronald F. Elsner, NASA Marshall Space Flight Ctr. (United States)
Marshall K. Joy, NASA Marshall Space Flight Ctr. (United States)
Stephen L. O'Dell, NASA Marshall Space Flight Ctr. (United States)
Brian D. Ramsey, NASA Marshall Space Flight Ctr. (United States)
Martin C. Weisskopf, NASA Marshall Space Flight Ctr. (United States)
Anthony W. Armstrong, Science Applications International Corp. (United States)
Bonnie L. Colborn, Science Applications International Corp. (United States)
Nina Kanvec, TRW Space & Electronics Group (United States)


Published in SPIE Proceedings Vol. 2518:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VI
Oswald H. W. Siegmund; John V. Vallerga, Editor(s)

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