Aluminum Thickness Tests

=No Photon Physics=

Varying Aluminum beamstop thickness

Tantalum thickness of 0.0508cm

All electron physics turned on

No photon physics turned on

Chamber and Tracker matter is vacuum

1 Radiation Length of Aluminum is 8.897cm

Aluminum Thickness	Photon Kinetic Energy Spectrum	Z Position of Photon Creation	Volume of Photon Creation
8.897cm
1.5875cm (5/8")
1.27cm (1/2")
4.4485cm
2.22425cm

Note: Volume 1 = Target, Volume 2 = Beamstop, Volume 3 = Tracker, Volume 4 = Chamber, Volume 5 = else

No Photon Physics

Varying Aluminum beamstop thickness

Tantalum thickness of 0.0508cm

All electron physics turned on

No photon physics turned on

Chamber and Tracker matter is vacuum

1 Radiation Length of Aluminum is 8.897cm

Aluminum Thickness	Photon Kinetic Energy Spectrum	Z Position of Photon Creation	Volume of Photon Creation
8.897cm
4.4485cm
2.22425cm
1.5875cm (5/8")
1.27cm (1/2")

Note: Volume 1 = Target, Volume 2 = Beamstop, Volume 3 = Tracker, Volume 4 = Chamber, Volume 5 = else

Conclusion

Without photon physics active and vacuum in the tracker and chamber, I cannot say whether electrons are making it though the target and beamstop.

Where are photons below 300 keV from?

Beamstop, tracker, chamber, world all in vacuum. Target is Tantalum of 0.0508cm thickness

As seen in this image, if I remove the Aluminum beamstop, the <300KeV photon peak disappears. This leads me to believe that the it was electrons/photons interacting in the aluminum to create the lower energy photons.

Photon Physics On

Varying Aluminum beamstop thickness

Tantalum thickness of 0.0508cm

All electron physics turned on

All photon physics turned on

Chamber and Tracker matter is vacuum

1 Radiation Length of Aluminum is 8.897cm

Aluminum Thickness	Photon Kinetic Energy Spectrum	Z Position of Photon Creation	Volume of Photon Creation
8.897cm
1.5875cm (5/8")			File:PhotonPhysOn Five eighths inch Al Volume.png
1.27cm (1/2")
4.4485cm
2.22425cm			File:PhotonPhysOn One quarter Rad Length Al Volume.png

Note: Volume 1 = Target, Volume 2 = Beamstop, Volume 3 = Tracker, Volume 4 = Chamber, Volume 5 = else

Conclusion

Why is tail 16 cm long?

I am going to rerun the 1 rad length simulation to see if i get the same result which will help me determine if i had an error in which matter i used in tracker/chamber, etc.

Photon Physics On with Air in Chamber and Tracker

Varying Aluminum beamstop thickness

Tantalum thickness of 0.0508cm

All electron physics turned on

All photon physics turned on

Chamber and Tracker matter is air (70% Nitrogen, 30% Oxygen)

1 Radiation Length of Aluminum is 8.897cm

Aluminum Thickness	Photon Kinetic Energy Spectrum	Z Position of Photon Creation	Volume of Photon Creation
8.897cm	File:Air PhotonPhysOn 1RadLengthAl.png	File:Air PhotonPhysOn oneRadLengthAl ZPos.png	File:Air PhotonPhysOn oneRadLengthAl Volume.png
1.5875cm (5/8")	File:Air PhotonPhysOn Five eighths inch Al.png	File:Air PhotonPhysOn Five eighths inch Al ZPos.png	File:Air PhotonPhysOn Five eighths inch Al Volume.png
1.27cm (1/2")	File:Air PhotonPhysOn Half inch Al.png	File:Air PhotonPhysOn Half inch Al ZPos.png	File:Air PhotonPhysOn Half inch Al Volume.png
4.4485cm	File:Air PhotonPhysOn Half Rad Length Al.png	File:Air PhotonPhysOn Half Rad Length Al ZPos.png	File:Air PhotonPhysOn Half Rad Length Al Volume.png
2.22425cm	File:Air PhotonPhysOn One quarter Rad Length Al.png	File:Air PhotonPhysOn One quarter Rad Length Al ZPos.png	File:Air PhotonPhysOn One quarter Rad Length Al Volume.png

Note: Volume 1 = Target, Volume 2 = Beamstop, Volume 3 = Tracker, Volume 4 = Chamber, Volume 5 = else

Conclusion

TriMev Simulations