Difference between revisions of "Some specifications on PMTs"
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#* assume that 2000 photons are collected (20 % light collection efficiency) | #* assume that 2000 photons are collected (20 % light collection efficiency) | ||
#* 400 p.e. (assuming 20% quantum efficiency) | #* 400 p.e. (assuming 20% quantum efficiency) | ||
| + | |||
''' Counter rates (according to the latest Dan's design) ''' | ''' Counter rates (according to the latest Dan's design) ''' | ||
| − | + | * 1.1 μ A electron current, <math>10^{-4} X_{0}</math> radiator | |
(corresponds to the photon flux of <math>5x10^{7}</math> phot/sec in the cohrent peak region) | (corresponds to the photon flux of <math>5x10^{7}</math> phot/sec in the cohrent peak region) | ||
| − | + | * Counter rate around E_gamma = 9 GeV: '''1 - 1.5 MHz''' | |
| − | (counter | + | (counter with ~20 MeV) |
Revision as of 15:43, 14 September 2012
Light yield estimates
- 5 mm thick scintillators
- 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 μ A electron current,
radiator
(corresponds to the photon flux of 
phot/sec in the cohrent peak region)
- Counter rate around E_gamma = 9 GeV: 1 - 1.5 MHz
(counter with ~20 MeV)
