# Aluminum Thickness Tests

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# 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
1 million electrons incident on Tantalum, single file
 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 the <300KeV photons from?

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
1 million electrons incident on Tantalum, single file
No beamstop present
 Physics Photon Kinetic Energy Spectrum (Vacuum) Photon Kinetic Energy Spectrum (Air) Photon Physics Off Photon Physics On

#### Conclusion

It is easy to see in these images that adding in air to the simulation creates the low energy photons. Although this peak is not as pronounced or have anywhere near as many photons as when the beamstop is present, therefore it is a combination of air in the tracker/chamber and the presences of an aluminum beamstop that is responsible for the low 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
1 million electrons incident on Tantalum, single file
 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

## 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
1 million electrons incident on Tantalum, single file
 Aluminum Thickness Photon Kinetic Energy Spectrum Z Position of Photon Creation Volume of Photon Creation 8.897cm 200px 200px 200px 1.5875cm (5/8") 200px 200px 200px 1.27cm (1/2") 200px 200px 200px 4.4485cm 200px 200px 200px 2.22425cm 200px 200px 200px
Note: Volume 1 = Target, Volume 2 = Beamstop, Volume 3 = Tracker, Volume 4 = Chamber, Volume 5 = else