2012AnnihCountrRateEstimate
Revision as of 17:31, 20 January 2012 by Foretony (talk | contribs) (→NaI rate Ratio of positron to electron beam)
Rate Estimates
Previous experiment at the IAC
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| IAC apparatus for positron production experiment | Counts observed when the dipole is tuned to direct positrons onto the Ta target | Counts from electrons on Ta target |
- HpGe observed about 1 annihilation photon per 10 microCoulombs of electrons on the upstream Tungsten target
- Ratio of annihilation photons observed when using positrons to electrons 120 to 10
| Condition | Grade Calculation |
| Electron Beam Energy | 10 MeV |
| Peak current | 40 mA |
| Pulse width | 100 ns |
| Rep Rate | 300 Hz |
NaI rate Ratio of positron to electron beam
Assumed Geometry
Assume a 2 mm thick Tungsten target that is 1" square
The target is located at -80 < Z < -80.2
The NaI crystal is 2.32" or 56.49 mm in diameter
The NaI crystal is 8" from the target then the opening angle is atan(2.32/8/2) = 8.25 degrees