Ricerc@Sapienza

A study on the Gaseous Electron Multiplier (GEM) foil material is performed to determine the moisture diffusion rate, moisture saturation level and the effects on its mechanical properties. The study is focused on the foil contact with ambient air and moisture to determine the value of the diffusion coefficient of water in the foil material. The presence of water inside the detector foil can determine the changes in its mechanical and electrical properties. A simulated model is developed with COMSOL Multiphysics v.

We present a novel application of Fiber Bragg Grating(FBG) sensors in the construction and characterisation of Micro Pattern Gaseous Detector (MPGD),with particular attention to the realisation of the largest triple (Gas electron Multiplier) GEM chambers so far operated, the GE1/1 chambers of the CMS experiment at LHC.The GE1/1 CMS project consists of 144 GEM chambers of about 0.5m 2 active are aeach,employing three GEM foils per chamber,to be installed in the forward region of the CMS endcap during the long shut down of LHC in 2108-2019.The large active area of each GE1/1chamber consists o

Systematic studies on the GEM foil material are performed to measure the moisture diffusion rate and saturation level.These studies are important because the presence of this compound inside the detector’s foil can possibly change its mechanical and electrical properties,and in such a way,the detector performance can be affected.To understand this phenomenon,a model is developed with COMSOL Multiphysicsv.4.3 which described the adsorption and diffusion within the geometry of GEM foil,the concentration profiles and the time required to saturate the foil.The COMSOL model is verified by experi

CYGNO experiment is working at the construction of one cubic meter TPC, based on Optical Readout of Gas Electron Multipliers (GEMs), for Directional Dark Matter search. This kind of research demands for very long dataacquisition runs and thus for high operation stability and reliability. This is one of the key elements of INITIUM project (ERC-2018-COG). The performance of such an approach was studied with a 7 liter sensitive volume detector.

Modern imaging sensors can be used to detect the scintillation light produced in Micro Pattern Gaseous Detectors (MPGDs) during electron avalanche multiplication. Gas mixtures with scintillation light spectra compatible with the quantum efficiency of CCD or CMOS cameras, can be used to implement an optical readout and to build 2D images of the events. Cygno project aims at developing an optical Time Projection Chamber (TPC) for directional dark matter searches and neutrino scattering measurements.