0000000001026482
AUTHOR
Cornelia B. Wunderer
Imaging test setup for the coded-mask /spl gamma/-ray spectrometer SPI
The European Space Agency's International Gamma-Ray Astrophysics Laboratory (INTEGRAL) will be launched in 2002. One of its two main instruments is the spectrometer SPI. It uses 19 HPGe detectors to observe the sky in the energy range of 20 keV to 8 MeV with a resolution of /spl Delta/E/E/spl ap/0.2%. Directional information is obtained using a coded mask. The expected angular resolution is about 20, The SPI imaging test setup (SPITS) was built at the Max-Planck-Institut fur Extraterrestische Physik, Germany, to allow experimental verification of the imaging properties of SPI. SPITS consists of a coded hexagonal uniformly redundant array (HURA) mask and two germanium detectors. The mask is …
SPI: The spectrometer aboard INTEGRAL
SPI is a high spectral resolution gamma-ray telescope on board the ESA mission INTEGRAL (International Gamma Ray Astrophysics Laboratory). It consists of an array of 19 closely packed germanium detectors surrounded by an active anticoincidence shield of BGO. The imaging capabilities of the instrument are obtained with a tungsten coded aperture mask located 1.7 m from the Ge array. The fully coded field-of-view is 16º, the partially coded field of view amounts to 31º, and the angular resolution is 2.5º. The energy range extends from 20 keV to 8 MeV with a typical energy resolution of 2.5 keV at 1.3 MeV. Here we present the general concept of the instrument followed by a brief description of …