Speaker
Description
"With the High-Luminosity Large Hadron Collider (HL-LHC) upgrade, the instantaneous luminosity will increase by almost an order of magnitude, reaching levels of up to (7.5\times10^{34}\ \mathrm{cm^{-2}s^{-1}}). This will lead to a substantial growth in the average pile-up density, with an expected average number of simultaneous proton-proton collisions per bunch crossing of approximately (\mu_b \approx 200), as well as a significantly harsher radiation environment in the forward region. These conditions impose extreme requirements on both the radiation hardness of the detector sensors and the precision and robustness of luminosity measurements.
a novel ATLAS Beam Monitoring Apparatus (BMA) has been specifically designed to perform precise and robust luminosity measurements under the demanding HL-LHC conditions. The BMA exploits the timing and counting capabilities of LGAD detectors to provide complementary and independent luminosity calibration, offering high segmentation, fast response, and intrinsic radiation tolerance.
This talk presents the research progress of LGAD detectors for the ATLAS BMA applications. In particular, we will report on the laboratory characterisation of the IHEP LGAD sensors developed for the ATLAS BMA luminosity monitoring, including static electrical performance, charge collection, and radiation hardness studies. Furthermore, we will describe the experimental setup, bias voltage tuning mothed and the luminosity measurement results obtained during beam tests conducted at CERN over the period from 2025 to 2026. The performance of the sensors in a real beam environment and the implications for luminosity monitoring under HL-LHC operating conditions will be discussed."
