Optimizing floating guard ring designs for FASPAX N-in-P silicon sensors

TL;DR

This paper discusses the design and optimization of silicon sensors with floating guard rings for the FASPAX X-ray detector, focusing on TCAD simulations and prototype characterization to meet high-speed, wide dynamic range requirements.

Contribution

It introduces a novel sensor design with optimized floating guard rings for improved performance in high-rate X-ray detection applications.

Findings

TCAD simulations guided guard ring optimization

Prototype sensors demonstrated effective high-speed performance

Design improvements enhanced dynamic range and sensitivity

Abstract

FASPAX (Fermi-Argonne Semiconducting Pixel Array X-ray detector) is being developed as a fast integrating area detector with wide dynamic range for time resolved applications at the upgraded Advanced Photon Source (APS.) A burst mode detector with intended $\mbox{13 $MHz$}$ image rate, FASPAX will also incorporate a novel integration circuit to achieve wide dynamic range, from single photon sensitivity to $10^{\text{5}}$ x-rays/pixel/pulse. To achieve these ambitious goals, a novel silicon sensor design is required. This paper will detail early design of the FASPAX sensor. Results from TCAD optimization studies, and characterization of prototype sensors will be presented.