Precision timing at the HL-LHC with the CMS MIP Timing Detector: current progress on validation and production

TL;DR

The CMS MIP Timing Detector aims to improve event reconstruction at the HL-LHC by providing precise timing information, with ongoing validation and production efforts for its subsystems to mitigate pileup effects.

Contribution

This paper reports on the current progress in validating and producing the CMS MIP Timing Detector, a novel timing layer for the HL-LHC upgrade.

Findings

System tests confirmed the performance of the full acquisition chain.

The BTL is currently under production.

ETL sensor prototyping and validation are ongoing.

Abstract

During the High Luminosity phase of LHC, up to 200 proton-proton collisions per bunch crossing will bring severe challenges for event reconstruction. To mitigate pileup effects, an extended upgrade program of the CMS experiment is expected. A new timing layer, the MIP Timing Detector (MTD), will be integrated between the tracker and the calorimeters. With a time resolution of 30-60 ps, the MTD will enable 4D vertexing and it will bring significant improvements in track-to-vertex association and object identification. The MTD is composed of two subsystems based on different technologies: the Barrel Timing Layer (BTL) consists of LYSO:Ce scintillating crystals readout by SiPMs and the Endcap Timing Layer (ETL) is made of Low Gain Avalanche Detectors. The BTL is currently under production, while ETL sensor prototyping and validation are ongoing. Recent system tests have confirmed the performance of the full acquisition chain. This talk will provide an overview of the MTD design, along with the physics motivation and the current status of BTL construction and ETL development.