Ricerc@Sapienza

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