Speaker
Description
The PICOSEC Micromegas (MM) is a gaseous detector for a precise timing measurement at the level of tens of ps. It combines a Cherenkov radiator equipped with a photocathode and a two-stage MM amplification structure. During the proof-of-concept phase, the first detector achieved an excellent time resolution below 25 ps for measurements with 150 GeV muons. Current developments towards applicable detector are progressing in several areas, including scaling the detector for larger areas, studies of the robust photocathode materials, implementation of the resistive detectors, multichannel readout and the optimization of the detector design. This work presents a new single channel detector prototype, developed to improve stability and ensure signal integrity to optimize timing performance. The first tests on the new detector, utilizing a MM with a metallic anode (Φ10 mm) and a CsI photocathode, achieved an excellent time resolution of 12.5 ps in muon beam tests. Due to the improvements observed on MM with metallic anode, the design was adapted to a resistive MM. Single photoelectron measurements were performed to evaluate the signal characteristics of both prototypes with metallic and resistive anodes. Additionally, timing performance was assessed with either CsI or DLC photocathode during beam tests, and both detectors exhibited similar time resolution. During these measurements, the impact of vertical digitization noise on the time resolution was also observed and investigated.
| Primary experiment | Picosec Micromegas Collaboration |
|---|
