prism-pmt air gap

Prism-pmt air gap.

  • CERN 18
  • S403, bat with 3-layer spherical lens, 4x2 MCP-PMT layout
  • p/pi @ 7 GeV/c
  • delta t selection with s = 0.5 ns
  • with beam direction correction
  • with per-PMT Cherenkov angle correction

Event display with ans w/o gap:

Photon yield after GR:

Separation power using Time Imaging: