Performance of the DIRC@EIC reconstruction for a configuration with a plate as part of the expansion volume.
- DIRC@EIC, EPIC
- 3-layer spherical lens with sapphire, r=[62,36] vs ideal lens
- 16x16 pixels MCP-PMTs with HIQ400, CE=95%
- pions and kaons @ 6 GeV/c; phi = 0 (no field); theta = 30 deg; vertex y-shifted by 0.5*barwidth (to hit middle of the bar)
- 0.5 mrad tracking
- 100 ps time precision
- geometrical reconstruction with averaged LUT from 15M photons
- GR with per-PMT and chromatic corrections
- 20k tracks for pdf generation (per each particle species); 5k for determining separation
Lens between bars and EV (EV-CL-bars-bars):
Lens between plate and EV (EV-CL-plate-bars):
Lens between bars and plate (EV-plate-CL-bars):
No Lens between bars and plate (EV-plate-bars):
Photon yield without cuts:
TI:
Lens between plate and bars (EV-plate-CL-bars), side view. Photons are lost on the sides of first two layers of the lens. Sides of 3rd layer are reflective.
Lens between plate and bars and THICK plate (EV-plate-CL-bars), side view:
Lens between plate and bars and THICK plate (EV-plate-CL-bars), side view, zoomed:
Photon yield without cuts:
TI:
Cylindrical lens with short first two layers (EV-thickplate-CL2s-bars):
Photon yield without cuts:
TI:
=> improvement in separation power was coming not from the increased photon yield but from the thicker plate.
Performance with spherical 3-layer lens between bars and 40 mm thick plate:
TI:
Per-angle plots: