NDLI: Prospects of hard X-ray polarimetry with Astrosat-CZTI

Content Provider	IEEE Xplore Digital Library
Author	Vadawale, S.V. Chattopadhyay, T. Rao, A.R.
Copyright Year	2013
Description	Author affiliation: Astron. & Astrophys. Div., Phys. Res. Lab., Ahmedabad, India (Vadawale, S.V.; Chattopadhyay, T.) \|\| Dept. of Astron. & Astrophys., Tata Inst. of Fundamental Res., Mumbai, India (Rao, A.R.)
Abstract	Astrosat is the first Indian satellite mission dedicated for astronomical studies. It is planned for launch during 2014 and will have five instruments for multi-wavelength observations from optical to hard X-rays. Cadmium Zing Telluride Imager (CZTI) is one of the five instruments aiming for simultaneous X-ray spectroscopy and imaging in the energy range of 10 to 100 keV (along with all sky photometric capability unto 250 keV). It is based on pixilated CZT detector array with total geometric area of 1024 $cm^{2}.$ It will have two-dimensional coded mask for medium resolution X-ray imaging. The CZT detector plane will be realized using CZT detector modules having integrated readout electronics. Each CZT detector module consists of 4 cm × 4 cm CZT with thickness of 5 mm which is further pixilated into 16 × 16 array of pixels. Thus each pixel has size of 2.5 mm × 2.5 mm and thickness of 5 mm. Such pixilated detector plane can in principle be used for hard X-ray polarization measurements based on the principle of Compton scattering by measuring azimuthal distribution of simultaneous events in two adjacent pixels. We have carried out detailed Geant4 simulations for estimating polarimetric capabilities of CZTI detector plane. The results indicate that events in the energy range of 100 to 250 keV, where the 5 mm thick CZT detector has significant detection efficiency, can be used for polarimetric studies. Our simulation results indicate the minimum detectable polarization (MDP) at the level of 5 % can be achieved for bright Crab like X-ray sources with exposure time of 500 ks. We also carried out preliminary experiments to verify the results from our simulations. Here we present detailed method and results of our simulations as well as preliminary results from the experimental verification of polarimetric capabilities of CZT detector modules used in Astrosat CZTI.
Starting Page	1
Ending Page	9
File Size	393422
Page Count	9
File Format	PDF
e-ISBN	9781479905348
DOI	10.1109/NSSMIC.2013.6829564
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-10-27
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Photonics Scattering Detectors Modulation Azimuthal angle X-ray imaging Polarimetry Astrosat-CZTI X-ray polarimetry Instrumentation Compton scattering
Content Type	Text
Resource Type	Article

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