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Proceedings Paper

In-flight calibration system for the INTEGRAL x-ray monitor JEM-X
Author(s): Enrico Costa; Marco Feroci; Lidia Barbanera; Massimo Frutti; Alda Rubini; Carl Budtz-Joergensen; Herbert W. Schnopper
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Paper Abstract

JEM-X is the x-ray monitor serving the two gamma-ray experiments imager and spectrometer onboard the ESA's INTEGRAL satellite. Due to the intrinsic weakness of the celestial sources in the gamma energy range they will need very long integration times. During these long pointings JEM-X will be able to detect very small variations on most x-ray sources, but only if accurately calibrated. The in- flight calibration system of the JEM-X experiment is devoted to measure the response of the detection chain (detector plus electronics) in a small set of positions and energies. The data from this system, together with on ground calibrations and simulations, must provide the capability to deconvolve pulse height spectra of celestial sources. The baseline for the in-flight calibration system foresees a set of four radioactive sources, maybe by Fe55 and Cd109 nuclides, and a pair of Amptek Cool-X15 X-ray generators. The latter is a novel product, based on a pyroelectric crystal used to generate energetic electrons that produce fluorescence lines by hitting a metallic target. We plan to use the four low intensity radioactive sources for monitoring the four independent anode chains, and the two x- ray tubes, one with a copper and the other with a molybdenum target, shared on the two twin detectors, for a flat illumination of the whole detectors area.

Paper Details

Date Published: 18 October 1996
PDF: 7 pages
Proc. SPIE 2806, Gamma-Ray and Cosmic-Ray Detectors, Techniques, and Missions, (18 October 1996); doi: 10.1117/12.253991
Show Author Affiliations
Enrico Costa, Istituto di Astrofisica Spaziale (Italy)
Marco Feroci, Istituto di Astrofisica Spaziale (Italy)
Lidia Barbanera, Istituto di Astrofisica Spaziale (Italy)
Massimo Frutti, Istituto di Astrofisica Spaziale (Italy)
Alda Rubini, Istituto di Astrofisica Spaziale (Italy)
Carl Budtz-Joergensen, Danish Space Research Institute (Denmark)
Herbert W. Schnopper, Danish Space Research Institute (Denmark)


Published in SPIE Proceedings Vol. 2806:
Gamma-Ray and Cosmic-Ray Detectors, Techniques, and Missions
Brian D. Ramsey; Thomas A. Parnell, Editor(s)

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