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

The G4Beamlin incident electron beam has the following properties

beam gaussian particle=e- nEvents=1000000 beamZ=0.0 
        sigmaX=1.0 sigmaY=1.0 sigmaXp=0.100 sigmaYp=0.100 
        meanMomentum=10.0 sigmaP=4.0 meanT=0.0 sigmaT=0.0


PbBi Thickness (mm) #positrons/million electrons (G4Beamline) #positrons/million electrons (MCNPX)
1 960,874, 916,934,897 1091
1.5 1508
2 1963,1919,1880,1877,1970 = 1902 [math]\pm[/math] 43 1984
2.5 1997
3 2233,2250, 2251,2226 , 2222=2236 [math]\pm[/math] 13 1986
3.5 2193
4 2184,2156,2089,2173,2181=2157 [math]\pm[/math] 39 1858
5 2042 1646
6 1851 1541
10 1480 1216

Energy Distribution

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

Angular distribution of positrons

TF Theta 04-28-15.png

Solenoid

Positrons#Simulations