Difference between revisions of "Optimization of Positron Capturing"

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Phase space for positrons coming out W-target.
 
Phase space for positrons coming out W-target.
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Include 100 % of the particles
  
 
=== X phase space ===
 
=== X phase space ===
  
Include 100 % of the particles
 
  
 
[[File:e+_X-Phase-Space_Ellipse_100-Per_Particles.png | 300 px]]
 
[[File:e+_X-Phase-Space_Ellipse_100-Per_Particles.png | 300 px]]
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=== Y phase space ===
 
=== Y phase space ===
  
Include 100 % of the particles
 
  
 
[[File:e+_Y-Phase-Space_Ellipse_100-Per_Particles.png | 300 px]]
 
[[File:e+_Y-Phase-Space_Ellipse_100-Per_Particles.png | 300 px]]
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 +
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== Phase Spaces ellipse of 39% particles ==
 +
 +
Total positrons created are 75483, and 39 % of them will be 29438. Core 39% area of the phase space ellipse is RMS emittance, <math>\epsilon_{rms}</math>.
 +
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a = 3.791; b = 1.189;
 +
 +
c = 3.791; d = 1.189;

Revision as of 21:39, 3 October 2011

  • Thickness of the Tungsten target: 1.25 mm
  • Beam size at Tungsten target: Gaussian, [math]\sigma_{x,y} = 3~mm[/math]

Optimization with ELEGANT Simulation on the Region from Gun Exit to Tungsten Target

Emittance: [math] \epsilon_{x,y} = 13~\mu m[/math] (Not sure yet, need to be calculated)

Average Peak [math] Q = 14~pC [/math]

Beam Energy: [math] 10~MeV [/math]

Energy Spread: [math] \sigma_{\delta}=4.23% [/math]

Alpha Function: [math] \alpha = [/math]

Beta Function: [math] \beta = [/math]

RMS longitudinal Bunch Length: [math] \sigma_{z} = 10.6~ps[/math]

GEANT4 Simulation for 2 mm W-Target

Thickness of the Tungsten target: 2 mm

Electron Beam:

Beam size at Tungsten target: Gaussian, [math]\sigma_{x,y} = 3~mm[/math]

Beam divergence at target: 0

Beam Energy: [math] 10~MeV [/math]

Energy Spread: [math] \sigma_{\delta}=4.23% [/math]


A volume called "detector" is placed at the of the W-target to get the information on the only of the outgoing positrons from the W-target. Followings are from "detector".

Phase Spaces of e+ Created

Phase space for positrons coming out W-target. Include 100 % of the particles

X phase space

E+ X-Phase-Space Ellipse 100-Per Particles.png

Y phase space

E+ Y-Phase-Space Ellipse 100-Per Particles.png


Phase Spaces ellipse of 39% particles

Total positrons created are 75483, and 39 % of them will be 29438. Core 39% area of the phase space ellipse is RMS emittance, [math]\epsilon_{rms}[/math].


a = 3.791; b = 1.189;

c = 3.791; d = 1.189;