Tanmoy Chattopadhyay

I am working on the development of advanced X-ray CCDs and their readout electronics for Advanced X-ray Imaging Satellite (AXIS) which is a NASA X-ray probe mission.

I am involved in the development of novel X-ray detector technologies (e.g. Single electron Sensitive Read Out / SiSeRO) which can provide order of magnitude faster readout speeds and sub-electron noise sensitivity simultaneously. Such detectors will be key to the development of sensitive spectro-imagers for the next generation flagship astronomy missions, e.g. Lynx in X-rays or Habitable Worlds, Spec-S5 in visible wavelength.

I am interested in the hard X-ray polarimetric studies of X-ray sources. With the advent of hard X-ray mirrors (e.g. NuSTAR), it is now possible to conceive hard X-ray polarimeters at the focal plane of hard X-ray telescopes. I have been working on the performance study and development of one such instrument which consisted of a central plastic scatterer (viewed by a PMT) surrounded by an array of CsI(Tl) scintillators (read out by Si photo-multipliers). We are also exploring the feasibility of replacing the plastic scatterer by a fast Silicon imager (a fast X-ray CCD / SiSeRO matrix / X-ray HCD) to enable simultaneous X-ray spectroscopy, imaging, timing and polarimetry.

I am involved in the X-ray spectro-polarimetric studies with CdZnTe Imager (CZTI) onboard Indian astronomy mission – AstroSat for various bright X-ray sources. We verified polarimetric capabilities of CZTI by measuring polarization of Crab pulsar and nebula. Currently, I am leading the spectro-polarimetry studies of Gamma-ray Bursts and Cygnus X-1, a high mass black hole X-ray binary using AstroSat-CZTI data.

Google scholar link - https://scholar.google.com/citations?user=xD-mOikAAAAJ&hl=en