G4Beamline PbBi

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Development of a Positron source using a PbBi converter and a Solenoid

Converter target properties

Definition of Lead Bismuth


1cm diameter target 2 mm thick PbBi

0.5 Tesla solenoid

G4BeamLine and MCNPX

Target thickness optimization

First simple test is to send 1 million, 10 MeV electrons towards a PbBi target and count how many positrons leave the downstream side

The Random number seed is set by Time in G4beamline to use a different set of pseudo random numbers each time it is run

PbBi Thickness (mm) #positrons/million electrons (G4Beamline) #positrons/million electrons (MCNPX)
1 960 1091
1.5 1508
2 1963,1919,1880 1984
2.5 1997
3 2233 1986
3.5 2193
4 2184 1858
5 2042
6 1851 1541
10 1480 1216

TF PosE 04-28-15.png Positrons2.png

Solenoid

Positrons#Simulations