PKU HEP Seminar and Workshop (北京大学高能物理组)

PKU-SJTU Collider Physics Forum for Junior Scholars (京沪云坛 No.12): The New Small Wheel upgrade project of the ATLAS experiment

by Dr Rongkun Wang (Harvard University)

Online (Cloud)




STJU indico cross-reference:

Zoom Meeting: 658 6447 7064 (Passcode: 594697)



The LHC Run 4 is planned to start around 2029 marking the High-Luminosity LHC era with its instantaneous luminosity increased to 5-7.5 times 10^34 cm-2 s-1. The ATLAS end-cap inner muon detector Small Wheels (SWs) are expected to suffer performance degradation due to the high background rate and will cease to provide good quality muon for physics analysis. The New Small Wheels (NSWs) upgrade is designed to be able to operate efficiently in this high background rate environment. The NSWs are the largest ATLAS Phase-I upgrade project installed during the 2018-2022 Long Shutdown 2 (LS2). Each wheel consists of 16 sectors covering the end-cap region. Each sector features 8 layers of small-strip Thin Gap Chambers (sTGC) and 8 layers of MicroMegas (MM) detectors. I will discuss the NSW detector design, commissioning, preliminary performance studies, and the remaining challenges.



Dr. Rongkun Wang is a postdoctoral researcher at Laboratory for Particle Physics and Cosmology (LPPC) at Harvard University. He obtained bachelor’s degree in 2015 at University of Science and Technology of China (USTC), working on preliminary study of Higgs to tau tau analysis at Circular Electron Positron Collider (CEPC) and simulation of Gaseous Electron Multiplier (GEM). He continued his Ph.D. study at USTC and was joint-educated with University of Michigan, Ann Arbor. His thesis topic is on Higgs to four lepton production cross section measurement and ZZ to four lepton lineshape measurement. Starting from the end of 2018 he participated in NSW electronics integration for small-strip Thin Gap Chamber(sTGC). After joining Harvard group in 2020, he continues to make major contribution to NSW commissioning, software development and trigger coordination. He is also working on the search of the SM tri-boson processes.