Overview of the Barrel Timing Layer Assembly for the High-Luminosity LHC

As part of the LHC's upcoming High Luminosity upgrade, more than triple the collisions per bunch crossing will occur than in previous runs. To accurately account for these collisions, the CMS detector is being augmented with a new timing detector in order to better localize these events. First, I will provide a broad overview of the MIP Timing Detector (MTD)'s Barrel Timing Layer (BTL). Some important points are the amount of precision achievable with this detector, which is predicted to localize events to 30 picoseconds in time, as well as the breakdown of the structure of the detection components. Along with data-collecting hardware, the BTL will be composed of 2,592 sensor modules, a quarter of which are being assembled at UVA before being placed into more complex modules to be shipped to CERN. I will be detailing UVA's efforts in starting the assembly of BTL, with a particular focus on the assembly and quality control/assurance of these sensor modules of the detector. This has involved not only the assembly of sensor modules themselves, but also the assembly and development of GAMBITs, tools specially made for consistent sensor module outcomes. Overall, strong progress has been made in establishing consistent procedure for sensor module assembly, feeding into the assembly of larger modules for the final detector. Finally, I will discuss the latest developments in this project and give a rough overview of the next steps on the road to its completion.