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