A. Rivetti | Researchain

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Journal of Instrumentation | 2017

A custom readout electronics for the BESIII CGEM detector

M. Da Rocha Rolo; M. Alexeev; A. Amoroso; R. Baldini Ferroli; M. Bertani; D. Bettoni; F. Bianchi; Ricardo Bugalho; A. Calcaterra; Nicola Canale; M. Capodiferro; V. Carassiti; S. Cerioni; Jy. Chai; S. Chiozzi; G. Cibinetto; F. Cossio; A. Cotta Ramusino; F. De Mori; M. Destefanis; A. Di Francesco; J. Dong; F. Evangelisti; R. Farinelli; L. Fava; G. Felici; E. Fioravanti; Isabella Garzia; M. Gatta; M. Greco

For the upgrade of the inner tracker of the BESIII spectrometer, planned for 2018, a lightweight tracker based on an innovative Cylindrical Gas Electron Multiplier (CGEM) detector is now under deve ...

Journal of Instrumentation | 2017

The Cylindrical GEM Inner Tracker of the BESIII experiment: Prototype test beam results

L. Lavezzi; N. Canale; R. Baldini Ferroli; E. Soldani; R. Malaguti; L. Yan; S. Spataro; S. Chiozzi; Jy. Chai; G. Morello; M. Gatta; S. Cerioni; M. Scodeggio; J. Pellegrino; S. Sosio; I. Garzia; S. Verma; M. Bertani; E. Fioravanti; G. Felici; R. Wheadon; F. Evangelisti; Rolo; M. Mignone; F. Cossio; P. Patteri; C. Leng; E. Tskhadadze; D. Bettoni; M. Maggiora

A cylindrical GEM detector is under development, to serve as an upgraded inner tracker at the BESIII spectrometer. It will consist of three layers of cylindrically-shaped triple GEMs surrounding the interaction point. The experiment is taking data at the e+e− collider BEPCII in Beijing (China) and the GEM tracker will be installed in 2018. Tests on the performances of triple GEMs in strong magnetic field have been run by means of the muon beam available in the H4 line of SPS (CERN) with both planar chambers and the first cylindrical prototype. Efficiencies and resolutions have been evaluated using different gains, gas mixtures, with and without magnetic field. The obtained efficiency is 97–98% on single coordinate view, in many operational arrangements. The spatial resolution for planar GEMs has been evaluated with two different algorithms for the position determination: the charge centroid and the micro time projection chamber (μ-TPC) methods. The two modes are complementary and are able to cope with the asymmetry of the electron avalanche when running in magnetic field, and with non-orthogonal incident tracks. With the charge centroid, a resolution lower than 100 μm has been reached without magnetic field and lower than 200 μm with a magnetic field up to 1 T. The μ-TPC mode showed to be able to improve those results. In the first beam test with the cylindrical prototype, the detector had a very good stability under different voltage configurations and particle intensities. The resolution evaluation is in progress.

Int. J. Mod. Phys. Conf. Ser. | 2018

arXiv : The new cylindrical GEM inner tracker of BESIII

L. Lavezzi; N. Canale; R. Baldini Ferroli; E. Soldani; R. Malaguti; S. Spataro; S. Chiozzi; L. Yan; G. Morello; M. Gatta; C. Leng; S. Cerioni; M. Scodeggio; J. Pellegrino; S. Sosio; I. Garzia; S. Verma; M. Bertani; E. Fioravanti; G. Felici; R. Wheadon; F. Evangelisti; Rolo; M. Mignone; F. Cossio; Jy. Chai; E. Tskhadadze; D. Bettoni; M. Maggiora; J. Dong

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 ...

Proceedings of The European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2017) | 2017

The new CGEM Inner Tracker and the new TIGER ASIC for the BES III Experiment

S. Marcello; Maxim Alexeev; A. Amoroso; Rinaldo Baldini Ferroli; Monica Bertani; D. Bettoni; Fabrizio Bianchi; Alessandro Calcaterra; N. Canale; Manlio Capodiferro; Vittore Carassiti; Stefano Cerioni; Jun-Yin Chai; Stefano Chiozzi; G. Cibinetto; F. Cossio; Angelo Cotta Ramusino; Giorgio Cotto; M. Rolo; Francesca De Mori; M. Destefanis; Jing Dong; Federico Evangelisti; R. Farinelli; L. Fava; G. Felici; I. Garzia; Maurizio Gatta; Michela Greco; L. Lavezzi

A new detector exploiting the technology of Gas Electron Multipliers is under construction to replace the innermost drift chamber of BESIII experiment, since its efficiency is compromised owing the high luminosity of Beijing Electron Positron Collider. The new inner tracker with a cylindrical shape will deploy several new features. The analogue readout and two complementary algorithms to reconstruct the position will allow achieving a spatial resolution of 130 µm in a 1 T magnetic field. For this purpose, TIGER, a new custom 64-channel ASIC, providing time and charge measurements, has been developed. Here, a summary of the most recent results on detector and electronics prototypes is given.