Difference between revisions of "Some specifications on PMTs"
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* Counter rate around E_gamma = 9 GeV: '''1 - 1.5 MHz''' | * Counter rate around E_gamma = 9 GeV: '''1 - 1.5 MHz''' | ||
: (counter with ~20 MeV) | : (counter with ~20 MeV) | ||
+ | * The rate is about 4 times larger for the last counter (at 3 GeV) |
Revision as of 15:56, 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)
- The rate is about 4 times larger for the last counter (at 3 GeV)