Difference between revisions of "2012AnnihCountrRateEstimate"
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Assume a 2 mm thick Tungsten target that is 1" square | Assume a 2 mm thick Tungsten target that is 1" square | ||
| − | The target is located at -80 < Z < -80.2 | + | 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 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 | The NaI crystal is 8" from the target then the opening angle is atan(2.32/8/2) = 8.25 degrees | ||
Revision as of 17:20, 19 January 2012
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 |
| If all Homework is complete and Simulation project is turned in on time | (50%) Homework + (50%)(Simulation Project) |
| If 1 homework set is incomplete or more than 48 hours late | (60%)Homework + (40%)(Simulation Project) |
| Otherwise | (70%)Homework + (30%)(Simulation Project) |
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