Speaker
Description
Detectors based on gas electron multipliers (GEM) are widely used in many high energy experiments due to its high rate capability, good energy resolution and low Ion back flow, for example in ALICE TPC, but they are also employed in applied physics, such as material analysis via x-ray fluorescence and tomography. In the case of a triple GEM, the detector operates by collecting the charge produced by some incident radiation in the sensitive volume, and multiplying it at each multiplication stage, achieving a final gain up to 104. These detectors need to circulate the gas in order to renovate the regions of multiplication and keep a good stability during long acquisition. However certain configurations of gas inlet and outlet can lead to a non-uniform gas renewal, resulting in spatial gain instabilities. This project aims to investigate different configurations for gas supply and its impacts on gas renewal. It also studies how other parameters can affect these areas, such as temperature and pressure and possible solutions for optimization of these detectors, regarding the geometry and high voltage system (e.g. temperature and pressure correction), especially for imaging applications.
| Name of the speaker | Daniel Neves Fachieri |
|---|---|
| Eligible for the Georges Charpak Young Scientist Award. | yes |