Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Poster

HK 52.24: Poster

Thursday, March 1, 2018, 16:30–18:45, Audimax Foyer

The Cylindrical Gas Electron Multiplier Inner Tracker for the BESIII Spectrometer — •Cristina Morales Morales for the BESIII collaboration — Helmholtz-Institut Mainz, Staudingerweg 18, 55129 Mainz, Germany

The BESIII experiment is a multi-purpose detector operating at the electron-positron collider BEPCII in Beijing. The experiment has been in operation since 2008 and has collected the world's largest data samples at the main charmonium resonances and XYZ exotic states. The innner drift chamber used as inner tracker will be replaced. In 2014 an upgrade was proposed based on the Cylindrical Gas Electron Multipliers (CGEM) technology with several innovations. The new mechanical support for the GEM foils will reduce the total radiation length of the detector and improve its tracking performance. An innovative design of the CGEM anode will allow for smaller capacitance and hence for bigger signals. The relatively strong BESIII magnetic field requires a new analogue charge and time readout. Full custom front-end electronics, including a dedicated ASIC, will be designed and produced for optimal data collection. Specific software will be developed to first simulate, and then reconstruct the CGEM hits to detect the reaction products. Proper benchmark channels will be identified and investigated to maximise the outcome of the project. In this contribution, an overview of the project will be presented.