Speakers
Description
Micromegas detectors are a cornerstone of modern high-rate tracking and imaging applications, including muon tomography, where precise spatial resolution and stable operation are essential for accurate trajectory reconstruction. While conventional (non-resistive) Micromegas detectors offer excellent signal localization, they are susceptible to discharges under high-rate conditions. Resistive Micromegas, incorporating a resistive anode layer, provide intrinsic spark protection but introduce charge-spreading effects that can influence position resolution.
In this work, we present a comparative study of resistive and non-resistive Micromegas detectors in the context of muon tomography. The study is based on ongoing experimental efforts involving the characterization of a high-granularity resistive Micromegas prototype alongside available non-resistive Micromegas. The experimental workflow focuses on absolute gas-gain and spatial-resolution measurements using standard radioactive sources.
To support and interpret the measurements, simulations are performed using the Garfield++ framework coupled with an enhanced neBEM (nearly exact Boundary Element Method) solver. The simulations focus on modeling the electric-field configuration, signal induction, and the influence of accumulated space charge on detector response. By combining experimental observations with simulation-based outcomes, this work aims to establish a consistent framework for evaluating the trade-offs between spark tolerance and spatial resolution in Micromegas detectors. The outcomes of this study are expected to provide useful insights for the optimization of Micromegas-based tracking systems in muon tomography and related applications.
| Name of the speaker | Shubhabrata Dutta |
|---|---|
| Eligible for the Georges Charpak Young Scientist Award. | yes |