3.5 cm vs 7 cm bar width

DIRC@EIC prototype simulation with CERN18 beam parameters. Comparison of the performance for 3.5 cm vs 7 cm bar width.
  • 12 PMTs layout with 3mm x 3mm pixels
  • 3.5 cm vs 7 cm bar with 3-layer cylindrical lens
  • 1 cm beam diameter, no divergence
  • kaon, pions @ 6 GeV/c
  • time imaging reconstruction
  • 100 ps time precision

Hit pattern (50k pi) for 3.5 cm bar @ 20 deg:

Hit pattern (50k pi) for 7.0 cm bar @ 20 deg:

Photon yield:

Separation power from time imaging:

Photon yield as a function of bar width:

Separation power from time imaging and geometrical reco as a function of bar width: