A&A Supplement series, Vol. 122, April II 1997, 309-326
Received May 15; accepted July 2, 1996
A.N. Parmar - D.D.E. Martin - M. Bavdaz - F. Favata - E. Kuulkers - G. Vacanti - U. Lammers - A. Peacock - B.G. Taylor
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Astrophysics Division, Space Science Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
The payload of the Italian/Dutch spacecraft BeppoSAX includes a set of four X-ray concentrators each of geometric area together with imaging gas scintillation proportional counter detectors located at the focal planes. One of these detectors, the Low-Energy Concentrator Spectrometer (LECS), is sensitive to X-rays in the energy range 0.1-10 keV, while the other three cover a narrower energy range of 1.3-10 keV. In order to achieve the extended low-energy response of the LECS a novel type of gas scintillation proportional counter has been developed which dispenses with the separate drift and scintillation regions of conventional instruments. The design and performance of the instrument together with its calibration and data analysis system are described here.
keywords: instrumentation: detectors -- methods: data analysis -- methods: observational -- techniques: spectroscopic -- X-rays: general