Speaker
Description
ePIC will be the first experiment at the upcoming Electron-Ion Collider (EIC) at Brookhaven National Laboratory. It will enable precision studies of nucleon and nuclear structure, addressing key open questions on confinement and on the behaviour of QCD in the non-perturbative regime.
The ePIC detector is designed to ensure large acceptance and excellent tracking performance. In the endcap regions, the G-RWELL technology, a hybrid of Gas Electron Multiplier (GEM) and micro Resistive Well ($\mu$-RWELL), has been chosen to provide precise tracking and good timing at pseudorapidity $|\eta|>2$.
The detector must satisfy stringent requirements in terms of material budget of about $1\%~X_0$ per disk, efficiency, $\sim 97\%$ per layer, time resolution better than $20$ ns, and spatial resolution of $150~\mu$m.
A dedicated test beam campaign was carried out at CERN in November 2025 at the H4 beamline to validate full-scale G-RWELL Engineering Test Article quadrants with $140$ GeV muon beams. Two detectors were tested, featuring a 2D strip readout with a pitch of $600~\mu$m. The data was collected using APV25 front-end electronics coupled to the Scalable Readout System and controlled by mmDAQ3. Reconstruction and analysis were tackled using custom libraries developed for strip-based MPGD detectors within the Corryvreckan framework.
Early results from the H4 test beam are promising, with detector efficiencies approaching requirements and spatial and time resolutions within the design specifications. This contribution will introduce the detector's design, the experimental setup, and the first performance estimates obtained with full-scale G-RWELL quadrants, demonstrating the suitability of this technology for the ePIC endcap tracker.
| Name of the speaker | Elena Sidoretti |
|---|---|
| Eligible for the Georges Charpak Young Scientist Award. | yes |