Modeling charge transport in Swept Charge Devices for X-ray spectroscopy

TL;DR

This paper develops an analytical model to simulate charge transport in Swept Charge Devices, aiming to improve spectral response understanding and optimize X-ray spectroscopy performance for space missions.

Contribution

It introduces a novel analytical model that captures energy and position dependence of the spectral redistribution function in SCDs, aiding in spectral analysis and device optimization.

Findings

Model accurately simulates charge transport and spectral redistribution.

Helps optimize event selection and recovery in X-ray spectroscopy.

Provides a prototype physical model and algorithm for SCDs.

Abstract

We present the formulation of an analytical model which simulates charge transport in Swept Charge Devices (SCDs) to understand the nature of the spectral redistribution function (SRF). We attempt to construct the energy-dependent and position dependent SRF by modeling the photon interaction, charge cloud generation and various loss mechanisms viz., recombination, partial charge collection and split events. The model will help in optimizing event selection, maximize event recovery and improve spectral modeling for Chandrayaan-2 (slated for launch in 2014). A proto-type physical model is developed and the algorithm along with its results are discussed in this paper.