Some specifications on PMTs

Light yield estimates

1. 5 mm thick scintillators
2. 10000 initial photons per tagged electron
   • assume that 2000 photons are collected (20 % light collection efficiency)
   • 400 p.e. (assuming 20% quantum efficiency)

Counter rates (according to the latest Dan's design)

1. 1.1 μ A electron current, $10^{{-4}}X_{{0}}$ radiator (corresponds to the photon flux of $5x10^{{7}}$ phot/sec.