G-RWELL performance studies for ePIC’s MPGD Endcap Tracker

Le résumé fourni par la source

ePIC will be the first experiment at the upcoming Electron-Ion Collider (EIC) at Brookhaven National Laboratory. The EIC will probe the internal structure of nucleons and nuclei with unprecedented precision, shedding light on confinement and on the intriguing behaviour of QCD in the non-perturbative regime. The detector is designed to maximise acceptance, with a tracking system that combines Silicon trackers with Micro Pattern Gaseous Detectors (MPGDs). For the Endcap Trackers, the G-RWELL (hybrid GEM/ μ -RWELL) technology will be used to cover the forward and backward regions ( 2.5 < | η | < 3.5 ). Stringent requirements on material budget ( ≃ 1 % X 0 ), timing (20 ns), and spatial resolution ( 150 μ m ) are set for the subsystem. A test beam campaign on G-RWELL prototypes with 10 × 10 cm 2 active area and two-dimensional strip readout was carried out in November 2024 at the PS-T10 beamline at CERN. Data acquisition relied on the Scalable Readout System (SRS) with APV25 frontend electronics, driven by the mmDAQ3 software. Event reconstruction was performed through custom-built modules within the Corryvreckan framework, and the subsequent analysis focused on assessing spatial resolution and efficiency at different angles of incidence. These results demonstrate the highly satisfactory performance of the G-RWELL technology, marking the first step in the R&D campaign to confirm its capability to meet ePIC’s efficiency and resolution requirements on larger-area detectors with optimised readout, in line with the experiment’s final design.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.