2012AnnihCountrRateEstimate

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Rate Estimates

Previous experiment at the IAC

052008PosProdApparatus.png 052008PosProdSignal.png 052008PosProdBackgrd.png
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
Bend 2 Dipole Spot size at 2nd Dipole D2 Spot size at Phosphorous Target
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


PePPO_2012Run