XII International Workshop on Ring Imaging Cherenkov Detectors - RICH2025

The high-performance DIRC (hpDIRC) detector for the ePIC experiment
at the future Electron-Ion Collider (EIC) has progressed into an
advanced development stage, transitioning from simulation-driven
design to component validation and integration testing.
The baseline design, optimized through detailed and
test-beam-validated Geant4 simulations, features a novel 3-layer
spherical lens, small pixel sensors, and fast readout. It plans to
leverage repurposed BaBar DIRC radiator bars. Construction of a
modular hpDIRC prototype is nearing completion, with validation
underway at the Cosmic Ray Telescope (CRT) facility at Stony Brook
University. These efforts include the reuse and quality assurance of
legacy DIRC components and the gradual replacement of interim hardware
with ePIC-specific systems. The project is on track toward a full
Technical Design Report (TDR) by late 2026. This talk will present the
current status of the hpDIRC development, the integration, and reuse
strategy for key optical components, and performance studies from
ongoing CRT-based testing.