An. Parmar et al., THE LOW-ENERGY CONCENTRATOR SPECTROMETER ON-BOARD THE BEPPOSAX X-RAY ASTRONOMY SATELLITE, Astronomy & Astrophysics. Supplement series, 122(2), 1997, pp. 309-326
The payload of the Italian/Dutch spacecraft BeppoSAX includes a set of
four X-ray concentrators each of geometric area 124 cm(2) together wi
th imaging gas scintillation proportional counter detectors located at
the focal planes. One of these detectors, the Low-Energy Concentrator
Spectrometer (LEGS), 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 LE
GS a novel type of gas scintillation proportional counter has been dev
eloped which dispenses with the separate drift and scintillation regio
ns of conventional instruments. The design and performance of the inst
rument together with its calibration and data analysis system are desc
ribed here.