Abstract Details
| Name: Mithun N P S Affiliation: Physical Research Laboratory, Ahmedabad Conference ID: ASI2016_444 Title : Characterizing scintillator with Si photomultiplier for Compton X-ray polarimeter Authors and Co-Authors : S. V. Vadawale, T. Chattopadhyay, S. K. Goyal, A. R. Patel, Physical Research Laboratory, Ahmedabad Abstract Type : Poster Abstract Category : Instrumentation and Techniques Abstract : Scintillator detectors coupled with conventional photo-multipliers are being used in hard X-ray and gamma ray observatories since long. Now there is growing interest in scintillators coupled with silicon photo-multipliers (SiPM) for their potential use in spectroscopy, imaging and polarimetry in hard X-rays. With the use of new generation SiPM, it is now possible to bring down the lower energy threshold of scintillators to few tens of keV. In earlier work we have demonstrated successfully the use of CsI(Tl) scintillators read by SiPM in focal plane Compton polarimeter. To further improve the sensitivity of the polarimeter, the performance of different scintillators and SiPMs needs to be evaluated. In this context we characterize CsI(Tl) scintillator (5mm x 5mm x 15mm) read by SiPM at one end. We studied the detection probability for different incident photon energies as a function of distance from the SiPM. Geant4 simulations of X-ray interaction in scintillator and subsequent generation and transport of optical photons were carried out and was compared with the experimental results. How these results will help in deciding amongst the different scintillators and SiPMs and in arriving at optimum configuration will also be discussed. |