SLINK Misalignment & Single Plane Rate Analysis at Pixel Luminosity Telescope

This report shows the two analysis that has been done to understand in the Pixel Luminosity (PLT) data. The first one consisted in a misalignment observed between the PLT luminosity data and the CMS wbm reported luminosity. Meanwhile, the second analysis was about issues in the online data of the PLT. Both project were attacked in the same. Create or modify python, C++ scripts to get more data to analyze and find hints to solve the issues. Regarding to the first project, an important discovery in the data was crucial to understand that the misalignment was because of an conflict in the triggers, and it was finally solved. Meanwhile, the other analysis advanced greatly, after a python script to find the issues in the data was created

The Pixel Luminosity Telescope: a detector for luminosity measurement at CMS using silicon pixel sensors

International audienceThe Pixel Luminosity Telescope is a silicon pixel detector dedicated to luminosity measurement at the CMS experiment at the LHC. It is located approximately 1.75 m from the interaction point and arranged into 16 “telescopes”, with eight telescopes installed around the beam pipe at either end of the detector and each telescope composed of three individual silicon sensor planes. The per-bunch instantaneous luminosity is measured by counting events where all three planes in the telescope register a hit, using a special readout at the full LHC bunch-crossing rate of 40 MHz. The full pixel information is read out at a lower rate and can be used to determine calibrations, corrections, and systematic uncertainties for the online and offline measurements. This paper details the commissioning, operational history, and performance of the detector during Run 2 (2015–18) of the LHC, as well as preparations for Run 3, which will begin in 2022