Difference between revisions of "Aluminum Thickness Tests"

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|4.4485cm || [[File:PhotonPhysOn_Half_Rad_Length_Al.png|200px]] || [[File:PhotonPhysOn_Half_Rad_Length_Al_ZPos.png|200px]] [[File:PhotonPhysOn_Half_Rad_Length_Al_ZPos_Grass.png|200px]] || [[File:PhotonPhysOn_Half_Rad_Length_Al_Volume.png|200px]]
 
|4.4485cm || [[File:PhotonPhysOn_Half_Rad_Length_Al.png|200px]] || [[File:PhotonPhysOn_Half_Rad_Length_Al_ZPos.png|200px]] [[File:PhotonPhysOn_Half_Rad_Length_Al_ZPos_Grass.png|200px]] || [[File:PhotonPhysOn_Half_Rad_Length_Al_Volume.png|200px]]
 
|-
 
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|2.22425cm || [[File:PhotonPhysOn_one_quarter_Rad_Length_Al.png|200px]] || [[File:PhotonPhysOn_one_quarter_Rad_Length_Al_Zpos.png|200px]] [[File:PhotonPhysOn_one_quarter_Rad_Length_Al_Zpos_Grass.png|200px]] || [[File:PhotonPhysOn_One_quarter_Rad_Length_Al_Volume.png|200px]]
+
|2.22425cm || [[File:PhotonPhysOn_one_quarter_Rad_Length_Al.png|200px]] || [[File:PhotonPhysOn_one_quarter_Rad_Length_Al_Zpos.png|200px]] [[File:PhotonPhysOn_one_quarter_Rad_Length_Al_Zpos_Grass.png|200px]] || [[File:PhotonPhysOn_one_quarter_Rad_Length_Al_Volume.png|200px]]
 
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Revision as of 20:01, 17 October 2017

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 1RadLengthAl.png OneRadLengthAl ZPos.png OneRadLengthAl Volume.png
4.4485cm Half Rad Length Al.png Half Rad Length Al ZPos.png Half Rad Length Al Volume.png
2.22425cm One quarter Rad Length Al.png One quarter Rad Length Al ZPos.png One quarter Rad Length Al Volume.png
1.5875cm (5/8") Five eighths inch Al.png Five eighths inch Al ZPos.png Five eighths inch Al Volume.png
1.27cm (1/2") Half inch Al.png Half inch Al ZPos.png Half inch Al Volume.png

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?

These simulations have photon physics turned on
Beamstop, tracker, chamber, world all in vacuum. Target is Tantalum of 0.0508cm thickness
Beamstop & world in vacuum, tracker and chamber are air. Target is Tantalum of 0.0508cm thickness



As seen in the first 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.
In the second image, the low energy peak reappears, but is not the same as with the earlier simulations when the beamstop was aluminum. Looking at the volume in which photons were created, I can see that there are some interactions in the air. This could be pair production or electrons interacting directly with the air. These photons were not present in the simulation without air.

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 1RadLengthAl PhotonPhysOn.png PhotonPhysOn oneRadLengthAl ZPos.png PhotonPhysOn oneRadLengthAl ZPos Grass.png PhotonPhysOn oneRadLengthAl Volume.png
1.5875cm (5/8") PhotonPhysOn five eighths inch Al.png PhotonPhysOn five eighths inch Al ZPos.png PhotonPhysOn five eighths inch Al ZPos Grass.png PhotonPhysOn five eighths inch Al Volume.png
1.27cm (1/2") PhotonPhysOn Half inch Al.png PhotonPhysOn Half inch Al ZPos.png PhotonPhysOn Half inch Al ZPos Grass.png PhotonPhysOn Half inch Al Volume.png
4.4485cm PhotonPhysOn Half Rad Length Al.png PhotonPhysOn Half Rad Length Al ZPos.png PhotonPhysOn Half Rad Length Al ZPos Grass.png PhotonPhysOn Half Rad Length Al Volume.png
2.22425cm PhotonPhysOn one quarter Rad Length Al.png PhotonPhysOn one quarter Rad Length Al Zpos.png PhotonPhysOn one quarter Rad Length Al Zpos Grass.png 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 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

Conclusion

TriMev Simulations

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