Mlr Summ TF

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VanWasshenova_Thesis#Mlr_Summ_TF

Moller Summary

Scattering Xsect

Moller Electron Angle Theta in Lab Frame
Figure 1: GEANT4 Simulation for the Moller electron scattering angle theta distribution for 6E6 incident 11 GeV electrons in the Lab frame of reference. The LH2 target reduces the mean free path of the Moller electron to around 60 degrees in the lab frame. This property of limiting the Moller angle is independent of the target length.


https://wiki.iac.isu.edu/index.php/Converting_to_barns


[math]\frac{d\sigma}{d\Omega}=\frac{ e^4 }{8E^2}\left \{\frac{1+cos^4\frac{\theta}{2}}{sin^4\frac{\theta}{2}}+\frac{1+sin^4\frac{\theta}{2}}{cos^4\frac{\theta}{2}}+\frac{2}{sin^2\frac{\theta}{2}cos^2\frac{\theta}{2}} \right \}[/math]




Moller Electron Energy vs Angle Theta in Lab Frame
Figure 2: Using the theoretical differential cross section, the distribution of Moller electrons for a CM energy of approximately 53Mev can be distributed through the CM scattering angle Theta. Using Lorentz transformations, these distributions can be transformed to the lab frame. At around 60 degrees in the lab the Moller electron has an energy of close to 1 MeV. Such a low energy does not allow the Moller electron to leave the constrains of the target where they are created.


Theory Frame Moller CM Frame
Figure 3a: A plot of the number of Moller scattering angle theta in the center of mass frame versus the theoretical differential cross section. The width of the bins is 0.001 degrees for the angles in the center of mass frame corresponding to angles of 5 to 40 degrees in the lab frame. A weight has been assigned for each value in theta which will give the theoretical differential cross section when applied.
Theory Lab Frame Moller Frame
Figure 3b: A plot of the number of Moller scattering angle theta in the lab frame versus the theoretical differential cross section. The width of the bins is 0.5 degrees for the angles in the lab frame. A weight has been assigned for each value in theta which will give the theoretical differential cross section when applied.

Baseline

Moller events using an lH2 target geometry No Raster

DC

Beamline

Magnet Components

FTOn

FTOff

clas12


DC hits -vs- Solenoid

With the Torus at zero Magnetic field the solenoid is changes to show how moller electrons move off the faces of R1 DC.


With Magnet Components

ChangingRates S1 PhiThetaHits Full.png


HitMakeUp.png


ComparingOppositeFields S1 PhiThetaHits.png

Without Magnet Components

ComparingMagnetComponents S1 PhiThetaHits.png


ChangingSolenoidRates wo Magnets.png

With Only S1R1 DC
What happens when Endplate material is vacuum?

ComparingDCcomponents S1 PhiThetaHits.png

Moller Electron Events(1st hits)

S1 50nA PrimaryElectronSigmasWeightedRates Full.png

Photons Hits in R1

S1 PhiThetaGammaHits Full.png



Tomography

S1 PhiThetaGammaVertex wo MagnetComponents.png


GammaVertexLocations.png

Moller events using an dual polarized target geometry with Raster

Photon Hits in R1 when Raster size has radius of 0.2 cm

Moller rate -vs- length of a single taerget

0.5 cm radius -vs- Z

Target is a one 0.5 cm radius cylinder of length Z.

By how much does the moller rate change at full field ?

Latest Stuff

VanWasshenova_Thesis#Mlr_Summ_TF