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:
