Speaker
Description
Modern high-energy physics experiments make considerable use of Gas Electron Multipliers (GEMs), a crucial type of Micro-Pattern Gas Detectors (MPGDs), because of their exceptional spatial resolution, high-rate capabilities, and operational stability. Ion backflow, which results in space-charge accumulation, electric-field distortions, and gain instabilities under high-luminosity circumstances, is still a significant drawback of traditional bi-conical GEM devices. For the development of next-generation detectors, simultaneous adjustment of gain and ion backflow is crucial since they are two of the most important performance characteristics.
In this work, we use ANSYS Mechanical APDL and Garfield++ simulations to study GEM detectors utilizing a redesigned single-conical hole shape with increased lower copper thickness. In order to assess electron multiplication, ion absorption, and ion backflow suppression, the research methodically expands from single- to multi-layer GEM setups. Compared with the conventional bi-conical geometry, the modified design consistently demonstrates enhanced gain and significantly reduced ion backflow, while ion absorption improves with increasing GEM layers and approaches saturation beyond five foils. These results highlight the potential of optimized GEM geometries to achieve superior detector stability and performance, providing valuable guidance for the design of future high-luminosity GEM-based experiments.
| Name of the speaker | Mohammad Kaosor Ali Mondal |
|---|---|
| Eligible for the Georges Charpak Young Scientist Award. | yes |