The new cylindrical GEM inner tracker of BESIII
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.
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Cite
@article{arxiv.1803.07258,
title = {The new cylindrical GEM inner tracker of BESIII},
author = {L. Lavezzi and M. Alexeev and A. Amoroso and R. Baldini Ferroli and M. Bertani and D. Bettoni and F. Bianchi and A. Calcaterra and N. Canale and M. Capodiferro and V. Carassiti and S. Cerioni and JY. Chai and S. Chiozzi and G. Cibinetto and F. Cossio and A. Cotta Ramusino and F. De Mori and M. Destefanis and J. Dong and F. Evangelisti and R. Farinelli and L. Fava and G. Felici and E. Fioravanti and I. Garzia and M. Gatta and M. Greco and CY. Leng and H. Li and M. Maggiora and R. Malaguti and S. Marcello and M. Melchiorri and G. Mezzadri and M. Mignone and G. Morello and S. Pacetti and P. Patteri and J. Pellegrino and A. Pelosi and A. Rivetti and M. D. Rolo and M. Savrie' and M. Scodeggio and E. Soldani and S. Sosio and S. Spataro and E. Tskhadadze and S. Verma and R. Wheadon and L. Yan},
journal= {arXiv preprint arXiv:1803.07258},
year = {2018}
}
Comments
Proceedings for "Particles and Nuclei International Conference 2017" (PANIC17) Conference, 1-5 September 2017, Beijing, China (prepared for submission to International Journal of Modern Physics: Conference Series)