Difference between revisions of "G4Beamline PbBi"

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Line 114: Line 114:
  
 
[[File:ElectronEnergy.png| 200 px]][[File:PhotonEnergy.png| 200 px]]
 
[[File:ElectronEnergy.png| 200 px]][[File:PhotonEnergy.png| 200 px]]
 
I was unable to do anything other than a gaussian beam right now,  I will try to do one later
 
 
For now I have a gaussian with an 8mm RMS and 10 MeV incident electrons as shown below.
 
 
The positron and electron momentum distributions after the PbBi converter are shown below
 
 
 
[[File:4-30-2015_PositronMomentum_2mm.png| 200 px]][[File:4-30-2015_ElectronMomentum_2mm.png| 200 px]]
 
 
A comma delimited text file with the above events in the format of
 
 
x,y,z,Px,Py,Pz
 
 
in units of cm for distance and MeV for momentum is located at
 
 
for positrons
 
 
http://www2.cose.isu.edu/~foretony/Positrons_2mm10MeV.dat
 
 
 
and
 
 
http://www2.cose.isu.edu/~foretony/Electrons_2mm10MeV.dat
 
 
 
for electrons
 
 
For now I have a gaussian with an 1mm RMS and 10 MeV incident electrons as shown below.
 
 
[[File:4-30-2015_BeamPosDelta.png| 200 px]][[File:4-30-2015_ElectronMomentum.png| 200 px]]
 
 
 
The positron and electron momentum distributions after the PbBi converter are shown below
 
 
 
[[File:4-30-2015_PositronMomentum_2mmDelta.png| 200 px]][[File:4-30-2015_ElectronMomentum_2mmDelta.png| 200 px]]
 
 
A comma delimited text file with the above events in the format of
 
 
x,y,z,Px,Py,Pz
 
 
in units of cm for distance and MeV for momentum is located at
 
 
for positrons
 
 
http://www2.cose.isu.edu/~foretony/Positrons_2mm10MeVDelta.dat
 
 
 
and
 
 
http://www2.cose.isu.edu/~foretony/Electrons_2mm10MeVDelta.dat
 
 
 
for electrons
 
  
 
=== 2mm thick PbBi, 10 MeV,  point source===
 
=== 2mm thick PbBi, 10 MeV,  point source===

Revision as of 16:39, 1 May 2015

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=916 +/- 33 1091
1.5 1508 1728
2 1963,1919,1880,1877,1970 = 1902 [math]\pm[/math] 43 1984
2.5 1997 2062
3 2233,2250, 2251,2226 , 2222=2236 [math]\pm[/math] 13 1986
3.5 2193 1938
4 2184,2156,2089,2173,2181=2157 [math]\pm[/math] 39 1858
5 2042 1646
6 1851, 1932, 1857, 1896,1924 = 1892[math] \pm[/math] 37 1541
10 1480,1488 1216

Comparison of G4Beamline and MCNPX


Comparison.png


Energy Distribution

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

Angular distribution of positrons

TF Theta 04-28-15.png


2mm thick PbBi, 10 MeV, 1 cm cylindrical incident electron distribution

G4beamline pencil beam 10 cm radius

beam ellipse particle=e- nEvents=1000000 beamZ=0.0 beamX=0. beamY=0. \
        sigmaX=10.0 sigmaY=10.0 sigmaXp=0.000 sigmaYp=0.000 \
      meanMomentum=10. sigmaE=0. maxR=10.
PbBi Thickness (mm) #positrons/million electrons (G4Beamline) #positrons/million electrons (MCNPX)
1 1091
1.5 1728
2 1902[math]\pm[/math] 43 1984
2.5 2062
3 [math]\pm[/math] 13 1986
3.5 1938
4 [math]\pm[/math] 39 1858
5 1646
6 [math] \pm[/math] 37 1541
10 1216


Layout.png

ElectronTracks.pngPhotonTracks.png

ElectronEnergy.pngPhotonEnergy.png

2mm thick PbBi, 10 MeV, point source

G4beamline pencil beam 10 cm radius

beam ellipse particle=e- nEvents=1000000 beamZ=0.0 beamX=0. beamY=0. \
        sigmaX=10.0 sigmaY=10.0 sigmaXp=0.000 sigmaYp=0.000 \
      meanMomentum=10. sigmaE=0. maxR=10.
PbBi Thickness (mm) #positrons/million electrons (G4Beamline) #positrons/million electrons (MCNPX)
1 1091
1.5 1728
2 1902[math]\pm[/math] 43 1984
2.5 2062
3 [math]\pm[/math] 13 1986
3.5 1938
4 [math]\pm[/math] 39 1858
5 1646
6 [math] \pm[/math] 37 1541
10 1216

Solenoid

Positrons#Simulations