Powered by Indico v3.0.3
https://cern.zoom.us/my/joaoguimaraes
Overall atlas upgrade Introduction (330 words): Joao, Zhijun
In order to study the newly discovered Higgs boson and find new physics, the Large Hadron Collider (LHC) of the European nuclear center will be upgraded to improve the brightness and collect more than 10 times the data, namely the high brightness LHC. LHC upgrade has become the focus of high energy physics. Therefore, the research and development of new detector technology to explore the physical potential of LHC has become the focus. The upgrade of high brightness LHC will respectively conduct proton cluster intersection every 25 nanoseconds in atlas experiment. Each intersection will produce about 200 collisions, forming a high pile up background of collision cases, which will seriously affect signal detection and data analysis. Therefore, the corresponding detector of atlas experiment needs major technical upgrading to deal with more severe radiation environment and more intensive physical cases.
This project selects several of the most critical topics in the atlas experiment upgrade to carry out pre research, including the development of a new high particle size time detector, and the upgrading of silicon track detector and muon detector.
Hgtd: 550 words
High particle size time detector is a new direction in the field of particle detection in the past two years. Compared with the nanosecond time resolution of the current atlas detector, the time resolution of the new detector can be increased by two orders of magnitude, up to 50 picoseconds. It will be like a high-speed camera, recording the time of arrival of particles with high accuracy, effectively judging which collision point the particle track comes from, so as to effectively reduce the accumulation background. Many new technologies will be developed for the development of high particle size time detectors, including high time resolution anti radiation sensor technology, front-end electronics ultrafast chip technology, large area ultrafast detector integration technology, etc. all countries are actively developing related technologies.
In terms of radiation resistance and high time resolution silicon sensors, Hamamatsu Corporation of Japan and FBK Research Institute of Italy once led the world. After 2021, two teams from the Institute of high energy physics of the Chinese Academy of Sciences (IHEP) and the University of science and technology of China (USTC) respectively developed high-time resolution radiation resistant silicon sensors using domestic technology, and the radiation resistance performance exceeded that of Hamamatsu and FBK sensors. In 2023, the Institute of high energy and the Institute of microelectronics jointly competed with Hamamatsu Corporation of Japan and FBK Institute of Italy for the international bidding of the silicon sensor on atlas high granularity time detector of the European nuclear center, and finally won the bidding, establishing the international leading position of domestic sensors in this technology.
In the aspect of detector module development, the Institute of high energy and Spain IFAE Institute led the advanced packaging development of sensors and ultrafast chips; Institute of high energy and University of science and technology led the automatic assembly of detector module; The Institute of high energy and the French team led the development of multiple detector units in a large area.
In terms of ultrafast readout electronics, the French ijlab National Laboratory and the European nuclear center led the research and development of ultrafast readout chips in the project. Institute of high energy and Nanjing University led the design of system level readout circuit and front-end readout circuit board, Institute of high energy and Shandong University led the development of high-voltage electronic system, and Shandong University also led the development of high-speed transmission flexible cable of the project.