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The Pixel Luminosity Telescope is a silicon pixel detector dedicated to luminosity measurement at the CMS experiment. It consists of 48 silicon sensor planes arranged into 16 "telescopes'' such that particles originating from the CMS interaction point will pass through all three planes in the telescope. It takes advantage of the "fast-or'' readout mode built into the CMS Phase-0 pixel readout chip, which can be processed at a frequency of 40 MHz, to determine the instantaneous luminosity from the rate of triple coincidences. The full pixel information, including hit position and charge, is read out at a lower rate of ~3 kHz and can be used for studies of systematic effects in the measurement. A full rebuild of the PLT was installed in early July 2021 in anticipation of Run 3 of the LHC, which incorporates a few silicon sensors developed for the CMS Phase-2 upgrade for the High-Luminosity LHC. Several detailed studies will be presented that illustrate the impact of radiation damage on the detector performance during Run 2. The lessons learned from Run 2 and the outlook for Run 3 will be underlined.
Invited by Janina Nicolini/Johannes Albrecht
Meeting ID: 913 8753 0254
Passcode: 561420
Hans Dembinski