INTEGRAL Image Gallery Comissioning and performance/verification phase
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IMAGER IBIS
First light data from the low energy detector array ISGRI of the IBIS imager.
For thermal uniformity reasons, all 8 modules were powered but only one module (shown in yellow) was biased to -120 V for about one hour. The module temperature was around -10°C. On the picture one notes the good uniformity of the active module and in the spectrum the W and CsI (probably) fluorescence lines as well as a weak 511 keV line due to the calibration source. The threshold was very low (close to 10 keV), it results in part from the exceptionally low temperature. This tests demonstrates the excellent performance of ISGRI.
