14 avr 09 Production of positron using gamma from Bremsstralhung
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
Tags: bremsstralhung, positron
17 fév 09 Production of polarised positron using Bremsstralhung
Initial parameters :
- e- beam 80-50 MeV normal incidence, stat. 10^6
- 100% longitudinal electron polarisation S(0,0,1)
- Tungsten target of 1×X0 = 3.5 mm (Z=74, ρ = 19.3 g/cm3)
Positron Yield = Ne+/Ne- ~ 15 %
Energy deposited in the tungsten target per initial incident electron ~ 14 MeV
Mean positron polarisation : Sz ~ 30 %
Modification of the positron yield, positron polarisation considering differents target thickness and
two differents inital electron energy (50 MeV and 80 MeV)
Initial electron energy 50 MeV
Positron Yield versus target thickness (different energy selection are shown)
Mean positron energy versus target thickness (different energy selection are shown)
Positron polarisation versus target thickness (different energy selection are shown)
Initial electron energy 80 MeV
Positron yield versus target thickness (different energy selection are shown)
Mean positron energy versus target thickness (different energy selection are shown)
Positron polarisation versus target thickness (different energy selection are shown)
Statics studies
