time precision scan

Performance of the ePIC DIRC as a function of PMT's time precision.

  • 3-layer spherical lens with sapphire, r=[62,36]
  • 3 mm pixels HIQ400, CE=95%
  • pi/K @ 6 GeV/c
  • 0.5 mrad track smearing at tracking layer
  • phi = 0 (no field); vertex y-shifted by 0.5*barwidth (to hit middle of the bar)
  • [0.05 - 1] ns 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) (generated with 0.5 mrad track resolution); 5k for determining separation

Photon yield after GR:

Photon yield after TI: