ORANGE: A high sensitivity particle tracker based on optically read out GEM

Marafini, M.; Patera, V.; Pinci, D.; Sarti, A.; Sciubba, A.; Spiriti, E.

doi:10.1016/j.nima.2016.04.014

ORANGE: A high sensitivity particle tracker based on optically read out GEM

Feb 11, 2017

4 pages

Part of Proceedings, 14th Vienna Conference on Instrumentation (VCI 2016) : Vienna, Austria, February 15-19, 2016, 285-288

Published in:

Nucl.Instrum.Meth.A 845 (2017) 285-288

Contribution to:

- VCI 2016
, 285-288

Published: Feb 11, 2017

DOI:

10.1016/j.nima.2016.04.014

reference search24 citations

Citations per year

Abstract: (Elsevier)

GEM-based detectors had a noticeable development in last years and have successfully been employed in different fields from High Energy Physics 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 makes possible to develop a high sensitivity, high granularity and low noise readout. In this paper 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 having a noise level less than two photons per pixel. The choice of a CF 4 rich gas mixture (He/CF 4 60/40) and a detailed optimisation of the electric fields allowed to reach a light-yield high enough to obtain very visible signals from minimum ionizing particles. In a test performed with 450 MeV electron beam, 800 photons per millimeter were collected and a space resolution of about 75μm was obtained.