BOLOMETERS AS SPECTROMETERS FOR X-RAY ASTRONOMY.

N. Coron, G. Artzner, G. Dambier, G. Jegoudez, J. Leblanc, J. Y. Deschamps, R. Rocchia, A. Tarrius, O. Testard, H. R. Ravn, H. H. Stroke, B. Jonson

    Research output: Contribution to journalConference articlepeer-review

    Abstract

    We have investigated the possibility to use composite diamond-germanium bolometers, originally developed for I. R. astronomy, for the individual detection of X-ray photons. The advantage of a composite bolometer is that it separates the absorption and detection functions. Diamond, as absorber, is especially interesting because of its high-thermal diffusivity and low heat capacity. The thermalization time of the whole device for a 1 multiplied by 1 mm**2 absorber is less than 50 mu s and allows the detection of a few tens or hundreds counts per second without degradation of the spectral resolution. The theoretical energy resolution DELTA E//f//w//h//m is proportional to T C1/2 where C, the specific heat of the bolometer, is a rapidly decreasing function of the temperature T. The expected value of DELTA E is less than 10eV at 0. 1 degree K. Associated with a 10**3 cm**2 telescope such a device, whose performance is essentially signal limited, is able to detect an emission line of 10** minus **7 ph. cm** minus **2 s** minus **1 in 10**5 seconds in the spectrum of a faint X-ray source.

    Original languageEnglish (US)
    Pages (from-to)229-231
    Number of pages3
    JournalEuropean Space Agency, (Special Publication) ESA SP
    StatePublished - 1985

    ASJC Scopus subject areas

    • Aerospace Engineering
    • Space and Planetary Science

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