DIRC

CORE barrel hpDIRC geometry: 47cm radius 290cm barbox length 16 barboxes, 5 long radiator bars side-by-side in a barbox Radiator bar: 10 x 35 x 2900 mm3 (T x W x L) (2-3 shorter bars glued together) Focusing optics: � Radiation-hard 3-layer spherical lens Expansion volume: � Solid fused silica prism: 24 x 18 x 30 cm3 (H x W x L)� Additional longitudinal space for MCP-PMTs, readout cards, cables: ~13cm Readout:� 12 commercial MCP-PMTs per prism, total 49k channels readout by hpDIRC Number of sectors, barrel radius and bar length can be still optimized for � integration, PID performance largely independent of barrel radius and bar length Expansion volume shape can be optimized for MCP-PMT magnetic field � performance (tilted backplane)