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 | |
|
|
| 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
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?
- 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") |  |
  |
200px |
| 1.27cm (1/2") |  |
  |
|
| 4.4485cm |  |
  |
|
| 2.22425cm |  |
  |
200px |
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 | 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