Volume 476 - 42nd International Conference on High Energy Physics (ICHEP2024) - Detectors for Future Facilities, R&D, Novel Techniques
Operation and readout of CGEM inner Tracker
F.M. Melendi*  on behalf of the CGEM-IT working group
*: corresponding author
Full text: pdf
Pre-published on: December 17, 2024
Published on: April 29, 2025
Abstract
The extension of the BESIII experiment (IHEP, Beijing) until 2030 has triggered a program to
improve the accelerator and the detector. In particular, it is proposed to replace the current inner
drift chamber with a cylindrical GEM detector. The inner CGEM tracker consists of three coaxial
layers of triple GEM and is expected to restore efficiency, improve z-determination and secondary
vertex position reconstruction with a resolution of 130 μm in the xy-plane and better than 500 μm
along the beam direction. A special readout system was developed. The signals are processed
by TIGER, a custom 64-channel 110 nm ASIC that provides an analog charge readout via a fully
digital output to the GEM Read Out Card. The three layers were assembled in October 2023 and
a cosmic ray data collection campaign is underway to evaluate performance prior to installation
in BESIII. The general status of the CGEM-IT project will be presented, with a particular focus
on the first cosmic ray detection results.
DOI: https://doi.org/10.22323/1.476.1086
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