Cory Gerrity L&S Sciences
Modeling of COSI Detector Fields for Charge Transport Simulation
In Compton telescopes with crossstrip germanium detectors, interactions on the detector strip borders where charge is split between strips result in significant signal loss that degrades spectral resolution. Thus, modeling this charge loss mechanism is essential for making corrections and maximizing the resolving power of the instrument. Yet despite this, the mechanism is not entirely understood. My project seeks to model charge collection and transport in the detectors of the Compton Spectrometer and Imager (COSI), a balloonborne gamma ray telescope operated out of the Space Sciences Laboratory. The research hopes to answer three main questions: What mechanism causes this charge loss? How can the charge loss be described in a numerical model? How can this model be used to apply corrections to the COSI data pipeline? Using Monte Carlo techniques, it is hoped that we can address these questions and extend the results to the next generation of detectors, which are much more susceptible to charge splitting due to their narrower strips.