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Abstract:
The talk includes the development of high granularity timing detectors for the ATLAS experiment on the Large Hadron Collider (LHC) and the development of pixel detectors for the next-generation high-energy circular electron-positron collider (CEPC).
To address the issue of event pile-up in the high-luminosity LHC, the ATLAS experiment is developing high timing resolution silicon detectors. A key technology involved is the new Low-Gain Avalanche Diode (LGAD) sensors. The Institute of high energy physics (IHEP) team has developed domestically produced radiation-hard LGAD sensors for the ATLAS experiment. After undergoing the radiation doses required for the ATLAS upgrade, their timing resolution remains better than 35 picoseconds.
In mid-2023, the European Organization for Nuclear Research (CERN) decided to purchase over 15,000 pieces of LGAD sensors from the speaker’s team, covering an area of more than 6 square meters. This marks the first application of domestically produced silicon sensors in the LHC. These types of sensors can also be used in applications such as next-generation 4D tracking detectors and proton CT imaging.
The next-generation Circular Electron Positron Collider (CEPC) presents new challenges for the vertex detector in terms of material budget, spatial resolution, readout speed,and power consumption. To address these challenges, the CEPC team has been conducting research and development for several years and successfully developed the first full-scale prototype of a silicon vertex detector in 2023. The detector prototype was tested on a high-energy beamline, and its spatial resolution was verified to be better than 5 micrometers, with a detection efficiency exceeding 99%. This presentation will provide an overview of the development of the silicon vertex detector.
Biography：
Zhijun Liang is a professor in the IHEP Experimental Physics Division. He serves as deputy leader of the IHEP ATLAS group. He is working on electroweak physics and silicon detector development in the ATLAS Collaboration and the CEPC. After obtaining his Ph.D. from Sun Yat-sen University in 2010, he worked as a postdoctoral researcher at the University of Oxford and University of California, Santa Cruz. In 2016, he joined IHEP through the Hundred-Talent Program of CAS.
During 2012 and 2013, he was appointed as the co-convener of the ATLAS electroweak physics group and the LHC electroweak physics group. He played a significant role in precision measurements of electroweak processes. From 2019 to the present, he has been appointed as the module and detector unit group Level-2 co-convener in the ATLAS High Granularity Timing Detector (HGTD) upgrade project. He has played a leading role in the development of radiation-hard ultra-fast sensors based on Low Gain Avalanche Diodes (LGADs). The LGAD sensor developed by IHEP is currently the most radiation-hard among all LGAD prototypes. CERN has chosen the LGAD sensor developed by IHEP in the procurement process for the ATLAS HGTD sensors. During 2021 and 2023, He served as a publication committee member in ATLAS Collaboration. Since 2019, he has served as the Level-2 convener for the High Granularity Timing Detector (HGTD) module group of the ATLAS experiment. As the task leader, he is responsible for the national key research and development project titled "Upgrade of the ATLAS Experiment High Granularity Timing Detector". In addition, he currently serves as the convener for the CEPC vertex detector system.
Alternative online link: https://meeting.tencent.com/dm/CWFzTBCTCFgg
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