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ATLAS Slides
Report number	ATL-MUON-SLIDE-2016-008
Title	Aging studies on the first resistive-micromegas quadruplet @ GIF++
Author(s)	Alvarez Gonzalez, Barbara (CERN)
Corporate author(s)	The ATLAS collaboration
Submitted to	4th International Conference on Micro Pattern Gaseous Detectors - MPGD2015, Trieste, Italy, 12 - 15 Oct 2015
Submitted by	[email protected] on 08 Jan 2016
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Micromgemas ; Muon ; Upgrade
Abstract	Aging studies of the first resistive-micromegas quadruplet at GIF++: preliminary results A resistive-micromegas quadruplet built at CERN, serving as prototype of the ATLAS micromegas, has been installed at the new CERN Gamma Irradiation Facility (GIF++) with the aim of carrying out a long-term aging study. The detector has four active layers about 0.5 m2 each equipped with 1024 read-out strips and sputtered resistive layer for spark protection. It is exposed to an intense gamma irradiation (~50 MHz/cm2 provided by the 16.65 TBq 137Cs source of GIF++), corresponding to ~10 times more the expected counting rate at High-Luminosity LHC. Two smaller resistive bulk-micromegas produced at the CERN PCB workshop have also been installed at GIF++ in order to provide a comparison of the aging behavior with the micromegas quadruplet. We will give an overview of the aging properties of the resistive micromegas after few months of irradiation at GIF++. Detector aging evolution will be presented in terms of dark and amplification currents, efficiency and noise stability as a function of the integrated charge. A first measurement of the sensitivity of the micromegas quadruplet to 137Cs gammas will also be presented.