Last modified: 2015-06-26
Abstract
F. Mammoliti1,2, V. Bellini1,2, M. Capogni3, E. Cisbani4,5, P. Musico6, F. Noto1,2, R. Perrino7, L.Re1,2, M.C. Sutera2
1Dipartimento di Fisica ed Astronomia, Università di Catania, via Santa Sofia 64,
I-95123 Catania, Italy
2INFN - Sezione di Catania, via Santa Sofia 64, I-95123 Catania, Italy
3Enea Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti(INMRI-ENEA), C.R.Casaccia,
C.P. 2400 I-00100 Roma, Italy
4INFN - Sezione di Roma La Sapienza, P.le Aldo Moro, 2 I-00185 Roma, Italy
5Istituto Superiore di Sanità, viale Regina Elena 299, I-00161 Roma, Italy
6INFN – Sezione di Genova, via Dodecaneso 33, I-16146 Genova, Italy
7INFN – Sezione di Lecce, via Arnesano, I-73100 Lecce, Italy
Corresponding Author: Francesco Mammoliti, Dipartimento di Fisica e Astronomia Via Santa Sofia 64, 95123 Catania (Italy). Email: francesco.mammoliti@ct.infn.it, tel.: +390953785266.
A new Large-Acceptance Forward Angle Spectrometer (Super BigBite) is under development at JLab/Hall A to optimally exploit the exciting opportunities offered by the 12 GeV upgrade of the electron beam. The tracking of this new apparatus is based on the Gas Electron Multiplier (GEM) technology [1], which has been chosen to optimize cost/performance, position resolution and meet the high hits rate (>1 MHz/cm2) [2].
The first GEM detector were designed, built and tested, during different periods, at the DESY test beam facility in Hamburg, by using an electron beam with an energy from 2.0 to 6.0 GeV. In particular, different chambers, with a dimension of 10x10 cm2 and 40x50 cm2, were equipped with a new implementation of the APV25 readout chip [3]. Measurements were performed at different impact points and angles between the electron beam and the plane of the GEM chambers.
In this report we present the technical characteristics of the detector and comment on the presently achieved performance.
Keywords: GEM Detector, Tracker.
[1] F. Sauli, “ GEM: A new concept for electron amplification in gas detectors “ Nucl. Instr. Meth. A 386 (1997) 531.
[2] V. Bellini et al. – “GEM tracker for high luminosity experiments at the JLab Hall A”, proceedings of the MPGD 2012 conference, to be published on JINST.
[3] M.J. French et al., “Design and results from the APV25, a deep sub-micron CMOS front-end chip for the CMS tracker”, NIM A466 (2002) 359.