Abstract
Detectors with a time resolution of 20-30 ps and a reliable performance in high particles flux environments are necessary for an accurate vertex separation in future HEP experiments. The PICOSEC-Micromegas detector concept is a Micro-Pattern Gaseous Detector (MPGD) based solution addressing this particular challenge. The PICOSEC-Micromegas concept is based on a Micromegas detector coupled to a Cherenkov radiator and a photocathode. In this detector concept, all primary electrons are initiated in the photocathode and the time jitter fluctuations are reduced. Different resistive anode layers have been tested with the goal of preserving a stable detector operation in a high intensity pion beam. One important characteristic of a gaseous detector in a high flux environment is the ion backflow (IBF). That can cause damage to more fragile photocathode materials like CsI. Various types of photocathode materials have been tested in order to find a robust solution against IBF bombardment.
Highlights
Tracking detectors with improved spatial resolution and timing performance are one solution to mitigate the pile-up effects that will occur in the future high luminosity colliders [1]
We report a progress in the detector design with a focus on the photocathode material
With this development we aim for a detector able to sustain high fluxes of ionising particles and retain its performance, initially limited by the ion back-flow (IBF) produced in the detector, throughout its operational lifetime
Summary
Tracking detectors with improved spatial resolution and timing performance are one solution to mitigate the pile-up effects that will occur in the future high luminosity colliders [1]. We report a progress in the detector design with a focus on the photocathode material With this development we aim for a detector able to sustain high fluxes of ionising particles (such as pions) and retain its performance, initially limited by the ion back-flow (IBF) produced in the detector, throughout its operational lifetime. Cherenkov photons are generated by relativistic charged particles passing through the crystal and simultaneously converted into electrons at the photocathode These primary electrons are preamplified in the drift gap, partially traverse the Micromegas mesh, and are amplified in an avalanche in the Micromegas amplification gap. A time resolution of 76 ps was measured for single photoelectrons, and 24 ps for 150 GeV muons with a mean number of 10.4 photoelectrons produced per muon These results were obtained with a CsI photocathode. This method is known as the ”floating strip” resistive Micromegas [5]
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