Speaker
Description
Detectors based on gas electron multipliers (GEM) are widely used in many high energy experiments due to their high rate capability, good energy resolution and low Ion back flow, 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 amplification stage, achieving a final gain up to $10^4$. These detectors need to circulate the gas in order to renovate the regions of multiplication and keep a good stability during long acquisition periods. However, certain configurations of gas inlet and outlet can lead to inhomogeneities in 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.
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