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Development of a CMOS pixel based inner tracker for the BES-III experiment at BEPC-II

Abstract : The thesis addresses the upcoming particle physics program foreseen at the Beijing Electron Positron Collider II, for which the Beijing Electron Spectrometer III (BESIII) is being upgraded. The work presented focused on the upgrade of the central tracker of the experiment by exploring the possibilities offered by a new approach using CMOS Pixel Sensors (CPS) instead of the present gas drift chamber. The performance of CPS with a larger pixel (39.0X50.8 µm2) and a lower power consumption has been validated, which will help to develop long ladders. A general strategy and software to optimise the design of a barrel pixelated tracker has also been developed, and its application on the BESIII silicon tracker indicates that the layout of three evenly placed single-sided layers is favoured by BESIII physics for the best momentum resolution, with an option using one double-sided ladder to achieve a higher tracking efficiency.
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Submitted on : Wednesday, March 7, 2018 - 10:26:09 AM
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  • HAL Id : tel-01725127, version 1

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Qingyuan Liu. Development of a CMOS pixel based inner tracker for the BES-III experiment at BEPC-II. Instrumentation and Detectors [physics.ins-det]. Université de Strasbourg, 2017. English. ⟨NNT : 2017STRAE021⟩. ⟨tel-01725127⟩

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