Difference between revisions of "Positrons Using The HRRL"
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The electrons which penetrate a 1 mm Tungsten foil have the momentum distribution below | The electrons which penetrate a 1 mm Tungsten foil have the momentum distribution below | ||
| − | + | Accelerating 100,000 6 MeV electrons onto a 1 mm thick Tungsten target | |
[[File:HRRL_6MeVePdist_71812.png]] | [[File:HRRL_6MeVePdist_71812.png]] | ||
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| − | + | Accelerating 100,000 10 MeV electrons onto a 1 mm thick Tungsten target | |
[[File:HRRL_10MeVePdist_71812.png]] | [[File:HRRL_10MeVePdist_71812.png]] | ||
| − | + | Accelerating 100,000 15 MeV electrons onto a 1 mm thick Tungsten target | |
[[File:HRRL_15MeVePdist_71812.png]] | [[File:HRRL_15MeVePdist_71812.png]] | ||
Revision as of 05:56, 19 July 2012
The purpose of this research is to evaluate the veracity of a positron beam line using the quad triplet method to collect positrons produced when a 10 MeV electron beam impinges on a 1.25 mm thick Tungsten target.
Positron Beam Properties
Tungsten thickness
The optimal Tungsten target thickness to produce positrons using a 10 MeV incident electron beam appears to be 1.25 mm.
Reference Serkan Thesis
Positron Momentum and Phase space distribution
Assuming a 10 meV electron beam having a gaussian spot size with a = 3mm.
We may want the achromat to have a 10% or less energy spread to measure the above distribution but we will also wan to open the slits to maximize positron current. This may mean accepting an energy spread of 30%.
Reference serkan thesis
Electron Momentum Distributions
According to GEANT4
The electrons which penetrate a 1 mm Tungsten foil have the momentum distribution below
Accelerating 100,000 6 MeV electrons onto a 1 mm thick Tungsten target
If the incident beam is 100 mA then you might get a current of 100*400/100000 = 0.4 mA of 3 MeV electrons.
Accelerating 100,000 10 MeV electrons onto a 1 mm thick Tungsten target
Accelerating 100,000 15 MeV electrons onto a 1 mm thick Tungsten target
Measured HRRL emittance
HRRL beam line
