PKU HEP Seminar and Workshop (北京大学高能物理组)
An overview on the BESIII Cylindrical GEM Internal Tracker
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Asia/Shanghai
B105 (CHEP)
B105
CHEP
West Building, School of Physics, PKU
Description
In 1997 the Gas Electron Multiplier was invented, to be adopted in the multiplication stage of gas detectors. The first advantage of this method of avalanche generation is the high stability even at higher rates, with respect to standard wire-based gas trackers. During the following years, the technique was improved and developed by adding more stages of multiplication: triple-GEM detectors are usually used to reach high gains with low discharge rates. KLOE-2, Laboratori Nazionali di Frascati (Italy), was the first experiment to build and successfully use a cylindrically shaped triple-GEM detector.
BESIII is the second experiment which will adopt a CGEM as inner tracker. It is following the legacy of KLOE-2 experience, but with some peculiarities and improvements, in the mechanics, electronics and reconstruction. The most important aspect of BESIII CGEM will be the analog readout, in the 1T magnetic field of the experiment. This will grant the possibility to exploit both the charge centroid and the micro-TPC position reconstruction methods and will grant an optimum spatial resolution. Several beam tests have been performed as well as a detailed detector response simulation has been implemented to evaluate and refine the detector performance. In this talk, an overview of the detector and some results will be discussed.
