Fast Timing for High-Rate Environments with Micromegas

TL;DR

This paper presents a Micromegas-based detector capable of achieving 10-20 ps timing resolution for high-rate environments, suitable for high-luminosity collider experiments, demonstrated through laboratory tests with a prototype.

Contribution

The study introduces a novel Micromegas detector design that significantly improves timing resolution for high-rate, high-radiation environments, advancing beyond current state-of-the-art methods.

Findings

Achieved ~27 ps timing resolution with a prototype Micromegas detector.

Demonstrated effective conversion of UV photons to precise timing signals.

Proved suitability for high-rate, high-radiation experimental conditions.

Abstract

The current state of the art in fast timing resolution for existing experiments is of the order of 100 ps on the time of arrival of both charged particles and electromagnetic showers. Current R&D on charged particle timing is approaching the level of 10 ps but is not primarily directed at sustained performance at high rates and under high radiation (as would be needed for HL-LHC pileup mitigation). We demonstrate a Micromegas based solution to reach this level of performance. The Micromegas acts as a photomultiplier coupled to a Cerenkov-radiator front window, which produces sufficient UV photons to convert the ~100 ps single-photoelectron jitter into a timing response of the order of 10-20 ps per incident charged particle. A prototype has been built in order to demonstrate this performance. The first laboratory tests with a pico-second laser have shown a time resolution of the order of 27 ps for ~50 primary photoelectrons, using a bulk Micromegas readout.