Difference between revisions of "Positrons Using The HRRL"

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[[File:HRRL_6MeVePdist_71812.png]]
 
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If the incident beam is 100 mA then you might get a current of 100*400/100000 = 0.4 mA of 3 MeV electrons.
  
 
=Measured HRRL emittance=
 
=Measured HRRL emittance=

Revision as of 04:40, 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.

PositronProduction-vs-Energy 10MeVelectrons.png

Reference Serkan Thesis

Positron Momentum and Phase space distribution

Assuming a 10 meV electron beam having a gaussian spot size with a [math]\sigma_{xy}[/math]= 3mm.

PositronMom Phase 10MeVelectrons.png


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

For a 100,000 6 MeV incident electrons

HRRL 6MeVePdist 71812.png

If the incident beam is 100 mA then you might get a current of 100*400/100000 = 0.4 mA of 3 MeV electrons.

Measured HRRL emittance

HRRL beam line

HRRL BeamLine 20101022.png

Fig.1 HRRL beamline for positron generation.


Positrons