CERN Accelerating science

Article
Report number	arXiv:1803.07258
Title	The new cylindrical GEM inner tracker of BESIII
Author(s)	Lavezzi, L. (Beijing, Inst. High Energy Phys. ; INFN, Turin) ; Alexeev, M. (INFN, Turin) ; Amoroso, A. (INFN, Turin ; Turin U.) ; Baldini Ferroli, R. (Beijing, Inst. High Energy Phys. ; Frascati) ; Bertani, M. (Frascati) ; Bettoni, D. (INFN, Ferrara) ; Bianchi, F. (INFN, Turin ; Turin U.) ; Calcaterra, A. (Frascati) ; Canale, N. (INFN, Ferrara) ; Capodiferro, M. (Frascati ; INFN, Rome) ; Carassiti, V. (INFN, Ferrara) ; Cerioni, S. (Frascati) ; Chai, Jy (Beijing, Inst. High Energy Phys. ; INFN, Turin ; Turin Polytechnic) ; Chiozzi, S. (INFN, Ferrara) ; Cibinetto, G. (INFN, Ferrara) ; Cossio, F. (INFN, Turin ; Turin Polytechnic) ; Cotta Ramusino, A. (INFN, Ferrara) ; De Mori, F. (INFN, Turin ; Turin U.) ; Destefanis, M. (INFN, Turin ; Turin U.) ; Dong, J. (Frascati) ; Evangelisti, F. (INFN, Ferrara) ; Farinelli, R. (INFN, Ferrara ; Ferrara U.) ; Fava, L. (INFN, Turin) ; Felici, G. (Frascati) ; Fioravanti, E. (INFN, Ferrara) ; Garzia, I. (INFN, Ferrara ; Ferrara U.) ; Gatta, M. (Frascati) ; Greco, M. (INFN, Turin ; Turin U.) ; Leng, Cy (Beijing, Inst. High Energy Phys. ; INFN, Turin ; Turin Polytechnic) ; Li, H. (Beijing, Inst. High Energy Phys. ; INFN, Turin) ; Maggiora, M. (INFN, Turin ; Turin U.) ; Malaguti, R. (INFN, Ferrara) ; Marcello, S. (INFN, Turin ; Turin U.) ; Melchiorri, M. (INFN, Ferrara) ; Mezzadri, G. (INFN, Ferrara ; Ferrara U.) ; Mignone, M. (INFN, Turin) ; Morello, G. (Frascati) ; Pacetti, S. (INFN, Perugia ; Perugia U.) ; Patteri, P. (Frascati) ; Pellegrino, J. (INFN, Turin ; Turin U.) ; Pelosi, A. (Frascati ; INFN, Rome) ; Rivetti, A. (INFN, Turin) ; Rolo, M.D. (INFN, Turin) ; Savrié, M. (INFN, Ferrara ; Ferrara U.) ; Scodeggio, M. (INFN, Ferrara ; Ferrara U.) ; Soldani, E. (Frascati) ; Sosio, S. (INFN, Turin ; Turin U.) ; Spataro, S. (INFN, Turin ; Turin U.) ; Tskhadadze, E. (Frascati ; Dubna, JINR) ; Verma, S. (Ferrara U.) ; Wheadon, R. (INFN, Turin) ; Yan, L. (INFN, Turin)
Publication	2018-05-03
Imprint	2018-03-20
Number of pages	6
In:	Int. J. Mod. Phys. Conf. Ser. 46 (2018) 1860077
In:	The 21st Particles & Nuclei International Conference, Beijing, China, 1 - 5 Sep 2017, pp.1860077
DOI	10.1142/S2010194518600777
Subject category	hep-ex ; Particle Physics - Experiment ; physics.ins-det ; Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN SPS
Test beam	H4
Abstract	The Cylindrical GEM-Inner Tracker (CGEM-IT) is the upgrade of the internal tracking system of the BESIII experiment. It consists of three layers of cylindrically-shaped triple GEMs, with important innovations with respect to the existing GEM detectors, in order to achieve the best performance with the lowest material budget. It will be the first cylindrical GEM running with analog readout inside a 1T magnetic field. The simultaneous measurement of both the deposited charge and the signal time will permit to use a combination of two algorithms to evaluate the spatial position of the charged tracks inside the CGEM-IT: the charge centroid and the micro time projection chamber modes. They are complementary and can cope with the asymmetry of the electron avalanche when running in magnetic field and with non-orthogonal incident tracks. To evaluate the behavior under different working settings, both planar chambers and the first cylindrical prototype have been tested during various test beams at CERN with 150 GeV/c muons and pions. This paper reports the results obtained with the two reconstruction methods and a comparison between the planar and cylindrical chambers.
Copyright/License	CC-BY-4.0 publication: © 2018-2024 The Author(s) preprint: (License: arXiv nonexclusive-distrib 1.0)

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