Scientific calibration of the PICsIT engineering model detector of the IBIS telescope

Details Scientific calibration of the PICsIT engineering model detector of the IBIS telescope Scientific calibration of the PICsIT engineering model detector of the IBIS telescope

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3765...33d&link_type=abstract

Proc. SPIE Vol. 3765, p. 33-41, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy X, Oswald H. Siegmund; Kathryn A. Flanag

Astronomy and Astrophysics

Astronomy

2

Scientific paper

IBIS is the imaging telescope onboard the ESA satellite INTEGRAL, which will be launched in September, 2001. IBIS will produce images of the gamma-ray sky in the region between 15 keV and 10 MeV by means of a position sensitive detection lane coupled with a coded aperture mask. The detection plane of IBIS comprises two position sensitive layers: ISGRI and PICsIT. PICsIT is a 64 X 64 unit array of approximately equals 0.75 cm2 crystals operative in the energy range between 150 keV and 10 MeV. The engineering model (EM) of PICsIT has now been calibrated and delivered to ESA. In this work we present the preliminary results obtained from the PICsIT EM scientific calibrations. These test were the first occasion for measuring the general behavior of the detector in terms of the key scientific performances. The gain, linearity, energy resolution, lower energy threshold and background counting rate for each detection unit and the variation of these parameters as a function of pixel position and were measured. Preliminary results regarding event multiplicity distribution, and energy resolution degradation for multiple events are also presented.

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