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Proceedings Paper

Absolute quantum efficiency calibration of the AXAF High-Resolution Camera
Author(s): Ralph Porter Kraft; John H. Chappell; Almus T. Kenter; K. Kobayashi; G. R. Meehan; Stephen S. Murray; Martin V. Zombeck; George W. Fraser; James F. Pearson; John Ernest Lees; Adam N. Brunton; Sarah E. Pearce
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Paper Abstract

We discuss the current status of the Advanced X-ray Astrophysics Facility (AXAF) High Resolution Camera (HRC) quantum efficiency (QE) calibration. The absolute quantum efficiency of flight candidate, CsI coated HRC microchannel plates (MCPs) for the imaging detector (HRC-I) manufactured by Galileo Electro-Optics Corporation (GEOC) has been measured at several energies. We find the absolute QE of these MCPs (measured at SAO) to be 0.41 at C Kalpha (E equals 277 eV) and 0.28 at Al Kalpha (E equals 1487) eV). The absolute QE of flight-like HRC-I MCPs manufactured by Phillips Components (measured at the University of Leicester) is approximately 0.40 at both C Kalpha and Si Kalpha (E equals 1739 eV). We are now in the process of measuring the absolute QE of both the HRC-I and HRC-S flight detectors at 22 different energies at 4 azimuthal and 5 polar angles. A summary of planned measurements is presented. In addition, we present data taken at the Daresbury Synchrotron Radiation Source to map out the detailed edge structure of the MCP glass and coatings. In particular, we present measurements of the relative QE of CsI coated MCPs around Cs and I M edges, and absolute measurements around the K K and Cs LIII edges. The absolute measurements of the flight instrument at the 22 discrete energies will be combined with the relative synchrotron measurements of flight-like detectors to produce the absolute QE of the HRC over the entire AXAF bandpass (0.1 to 10 keV).

Paper Details

Date Published: 31 October 1996
PDF: 16 pages
Proc. SPIE 2808, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VII, (31 October 1996); doi: 10.1117/12.255994
Show Author Affiliations
Ralph Porter Kraft, Smithsonian Astrophysical Observatory (United States)
John H. Chappell, Smithsonian Astrophysical Observatory (United States)
Almus T. Kenter, Smithsonian Astrophysical Observatory (United States)
K. Kobayashi, Smithsonian Astrophysical Observatory (United States)
G. R. Meehan, Smithsonian Astrophysical Observatory (United States)
Stephen S. Murray, Smithsonian Astrophysical Observatory (United States)
Martin V. Zombeck, Smithsonian Astrophysical Observatory (United States)
George W. Fraser, Univ. of Leicester (United Kingdom)
James F. Pearson, Univ. of Leicester (United Kingdom)
John Ernest Lees, Univ. of Leicester (United Kingdom)
Adam N. Brunton, Univ. of Leicester (United Kingdom)
Sarah E. Pearce, Univ. of Leicester (United Kingdom)

Published in SPIE Proceedings Vol. 2808:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VII
Oswald H. W. Siegmund; Mark A. Gummin, Editor(s)

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