Speaker
Description
In preparation for the extreme operating conditions of the HL-LHC and to introduce state-of-the-art capabilities to the experiment, the Compact Muon Solenoid (CMS) detector will undergo a major upgrade. A key innovation consists of the MIP Timing Detector (MTD), designed to measure the hit time of charged particles with a resolution better than 50 ps. The MTD will enable 4D reconstruction algorithms and allow the discrimination of interaction vertices within the same bunch crossing thanks to the time tagging information added to each track. To achieve the necessary time precision, the Endcap Timing Layer (ETL), covering the pseudorapidity region 1.6 < η < 3, will utilize Low-Gain Avalanche Diodes (LGADs), a novel silicon-based technology, read out by a custom-designed ASIC called ETROC. The ETL module exploits 16x16 pixels LGAD arrays that are bump-bonded to the corresponding ASIC ETROC. Over the past year, the first bump-bonded assemblies featuring ETROC2— the first full-size, fully functional prototype—were produced and tested in beam test campaigns at DESY and SPS. This presentation will cover the main design features of both the LGAD and ETROC2, recent progress in the ETL collaboration, the testing procedures for the newly fabricated assemblies, and the latest results obtained from beam tests of the full bump-bonded assemblies.
