G4Beamline PbBi
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 | 1963,1919,1880,1877,1970 | 1984 |
| 2.5 | 1997 | |
| 3 | 2233,2250 | 1986 |
| 3.5 | 2193 | |
| 4 | 2184 | 1858 |
| 5 | 2042 | 1646 |
| 6 | 1851 | 1541 |
| 10 | 1480 | 1216 |
