A 10GeV mono energetic electron beam (with au gaussian distribution in x and y
-in root : gRandom->Gaus(0,2.5e-3)/sqrt(2.)-) impinging on 0.1 cm amorphous tungsten produced gamma with this phase space (yield=#gamma/#e-=138966/50000~2.78)
Gamma energy distribution
X distribution
Y distribution
Those gamma are using to produce positron by impinging on 0.8 cm of amorphous tungsten
(distance between the two amophous target is 2m).
Positron phase space distribution(yield=#positron/#electron=143443/50000 ~2.86)
Energy distribution
X distribution
Y distribution
Momentum in X distribution
Momentum in Y distribution
Momentum in Z distribution