VCI2016 - The 14th Vienna Conference on Instrumentation

Feb 15 – 19, 2016
Vienna University of Technology
Europe/Vienna timezone

High sensitivity particle tracker based on optically readout GEM

Not scheduled
15m
Vienna University of Technology

Vienna University of Technology

Gusshausstraße 27-29, 1040 Wien
Board: 22
Poster Gaseous Detectors

Speaker

Davide Pinci (Universita e INFN, Roma I (IT))

Description

GEM-based detectors have had a noticeable development in last years and have successfully been employed in different fields from High Energy Phisics to imaging applications. Light production associated to the electron multiplication allows to perform an optical readout of these devices. The big progress achieved in CMOS-based photosensors make possible to develop a high sensitivity, high granularity and low noise readout. In this work we present the results obtained by reading out the light produced by a triple-GEM structure by means of a 4 mega-pixel CMOS sensor with a noise level lesser than 2 photons per pixel. The choice of a CF$_4$ rich gas mixture (He/CF$_4$ 60/40) and a detailed optimization of the electric fields allowed to reach a ligh-yield enough high to obtain, for the first time, very visible signals of cosmic ray muons. About 600 photons/mm were collected in average along the muon tracks and about 40 pixels/mm gave a response three sigmas large than the pedestal. Tracks due to electrons produced in natural radioactivity were also acquired and a light yield 10 times larger than cosmics was measured. A test beam is foreseen for November 2015. More quantitative evaluations of the detector performance (e. g. space resolution, tracking efficiency, light yield, energy released resolution) are expected. These results will also be presented at the conference.

Primary author

Davide Pinci (Universita e INFN, Roma I (IT))

Co-authors

Adalberto Sciubba (Universita e INFN, Roma I (IT)) Alessio Sarti (Universita e INFN, Roma I (IT)) Eleuterio Spiriti (Istituto Nazionale Fisica Nucleare Frascati (IT)) Michela Marafini (Unknown) Vincenzo Patera (Dipartim.di Fisica G.Marconi RomeI)