The New Cylindrical GEM Inner Tracker of BESIII

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Zeitschriftentitel:	International Journal of Modern Physics: Conference Series
Personen und Körperschaften:	Lavezzi, L., Alexeev, M., Amoroso, A., Baldini Ferroli, R., Bertani, M., Bettoni, D., Bianchi, F., Calcaterra, A., Canale, N., Capodiferro, M., Carassiti, V., Cerioni, S., Chai, JY., Chiozzi, S., Cibinetto, G., Cossio, F., Cotta Ramusino, A., De Mori, F., Destefanis, M., Dong, J., Evangelisti, F., Farinelli, R., Fava, L., Felici, G., Fioravanti, E., Garzia, I., Gatta, M., Greco, M., Leng, CY., Li, H., Maggiora, M., Malaguti, R., Marcello, S., Melchiorri, M., Mezzadri, G., Mignone, M., Morello, G., Pacetti, S., Patteri, P., Pellegrino, J., Pelosi, A., Rivetti, A., Rolo, M. D., Savrié, M., Scodeggio, M., Soldani, E., Sosio, S., Spataro, S., Tskhadadze, E., Verma, S., Wheadon, R., Yan, L.
In:	International Journal of Modern Physics: Conference Series, 46, 2018, S. 1860077
Format:	E-Article
Sprache:	Englisch
veröffentlicht:	World Scientific Pub Co Pte Lt
Schlagwörter:	General Medicine

Details
Zusammenfassung:	<jats:p> 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 behaviour under different working settings, both planar chambers and the first cylindrical prototype have been tested during various test beams at CERN with 150 GeV/[Formula: see text] muons and pions. This paper reports the results obtained with the two reconstruction methods and a comparison between the planar and cylindrical chambers. </jats:p>
Umfang:	1860077
ISSN:	2010-1945
DOI:	10.1142/s2010194518600777