Difference between revisions of "Thesis outline"

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*''Phase space''
 
*''Phase space''
 
*''Emittance (thermal, phase space, geometric)''
 
*''Emittance (thermal, phase space, geometric)''
*''Effective(drift) emittance (emittance of the magnetized beam)''
+
*''Effective(drift) emittance (emittance of a magnetized beam)''
*''Measuring the beam emittance''
+
*''Measuring/calculating the beam emittance''
  
 
==Space charge effect==
 
==Space charge effect==
*''Space charge effect in the magnetized beam''
+
*''Space charge effect in a magnetized electron beam''
  
 
==Simulations on the magnetized electron beam==  
 
==Simulations on the magnetized electron beam==  
 
===''ASTRA''===
 
===''ASTRA''===
**''Initial particle distribution''
+
*''Initial particle distribution''
**''Field maps (3D E field map, 2D B field map)''
+
*''Field maps (3D E field map, 2D B field map)''
**''Space charge calculation mechanism''
+
*''Space charge calculation mechanism''
**''Emittance''
+
*''Emittance''
 
===''GPT''===
 
===''GPT''===
**''Initial particle distribution (Laser*QE image processing)''
+
*''Initial particle distribution (Laser*QE image processing)''
**''Field maps (3D E field map, 2D B field map)''
+
*''Field maps (3D E field map, 2D B field map)''
**''Space charge calculation mechanism''
+
*''Space charge calculation mechanism''
**''Emittance''
+
*''Emittance''
 
===''Post-processing (MATLAB)''===
 
===''Post-processing (MATLAB)''===
  
==Characterization of the magnetized beam==
+
==Characterization of the magnetized electron beam==
 
===''Experimental method''===
 
===''Experimental method''===
**''Beam size vs solenoid I''
+
*''Beam size vs solenoid I''
**''Rotation angle vs solenoid I''
+
*''Rotation angle vs solenoid I''
**''Emittance vs solenoid I - two different laser sizes''
+
*''Emittance vs solenoid I - three different laser sizes''
**''Emittance vs laser spot sizes - max solenoid current''
+
*''Emittance vs laser spot sizes - max solenoid current''
===''ASTRA/GPT simulations (Simulation of all the above variations)''===
+
===''ASTRA/GPT simulations (Simulations of all the above variations)''===
 
*''Conclusions (comparisons -measurements vs simulations, mismatch oscillations, negative rotation angles, etc.)''
 
*''Conclusions (comparisons -measurements vs simulations, mismatch oscillations, negative rotation angles, etc.)''
  
==Experiments and numerical simulations of the space charge dominated magnetized beam==
+
==Experimental and numerical simulation results of the space charge dominated magnetized electron beam==
 
===''Experimental method''===
 
===''Experimental method''===
**''Pulse energy vs extracted charge-for different magnetizations''
+
*''Pulse energy vs extracted charge-for different magnetizations''
**''Space charge current limitation dependence on gun high voltage-for different magnetizations''
+
*''Space charge current limitation dependence on gun high voltage-for different magnetizations''
**''Space charge current limitation dependence on pulse width-for different magnetizations''
+
*''Space charge current limitation dependence on pulse width-for different magnetizations''
**''Space charge current limitation dependence on laser spot size-for different magnetizations''
+
*''Space charge current limitation dependence on laser spot size-for different magnetizations''
 
===''GPT simulations''===
 
===''GPT simulations''===
 
*''Conclusions (Comparison-measurements and simulations)''
 
*''Conclusions (Comparison-measurements and simulations)''
Line 56: Line 56:
 
*''High voltage conditioning''
 
*''High voltage conditioning''
  
==Repeated experimental and numerical simulations results of the space charge dominated magnetized beam with the new photogun ==
+
==Repeated experimental and numerical simulation results of the space charge dominated magnetized electron beam with the new photogun ==
  
 
==Summary and Conclusions==
 
==Summary and Conclusions==
  
 
------------------------------------------------------------------------------------------------------------------------------------
 
  
 
[[Sajini Wijethunga | Return to Sajini Wijethunga]]
 
[[Sajini Wijethunga | Return to Sajini Wijethunga]]

Latest revision as of 11:11, 29 May 2020

Introduction

  • Magnetized electron beam
  • Applications of the magnetized electron beam
    • Magnetized electron cooling
  • Jefferson Lab magnetized electron source for the JLEIC cooler

Generation of the magnetized electron beam

  • Experimental setup (DC HV gun, photocathode, cathode solenoid, RF laser, focusing solenoids, etc.)
  • Beam diagnostics

Beam dynamics

  • Beam matrix
  • Phase space
  • Emittance (thermal, phase space, geometric)
  • Effective(drift) emittance (emittance of a magnetized beam)
  • Measuring/calculating the beam emittance

Space charge effect

  • Space charge effect in a magnetized electron beam

Simulations on the magnetized electron beam

ASTRA

  • Initial particle distribution
  • Field maps (3D E field map, 2D B field map)
  • Space charge calculation mechanism
  • Emittance

GPT

  • Initial particle distribution (Laser*QE image processing)
  • Field maps (3D E field map, 2D B field map)
  • Space charge calculation mechanism
  • Emittance

Post-processing (MATLAB)

Characterization of the magnetized electron beam

Experimental method

  • Beam size vs solenoid I
  • Rotation angle vs solenoid I
  • Emittance vs solenoid I - three different laser sizes
  • Emittance vs laser spot sizes - max solenoid current

ASTRA/GPT simulations (Simulations of all the above variations)

  • Conclusions (comparisons -measurements vs simulations, mismatch oscillations, negative rotation angles, etc.)

Experimental and numerical simulation results of the space charge dominated magnetized electron beam

Experimental method

  • Pulse energy vs extracted charge-for different magnetizations
  • Space charge current limitation dependence on gun high voltage-for different magnetizations
  • Space charge current limitation dependence on pulse width-for different magnetizations
  • Space charge current limitation dependence on laser spot size-for different magnetizations

GPT simulations

  • Conclusions (Comparison-measurements and simulations)

Redesigning and performance of the photogun

  • Existing electrostatic design
  • Modified electrostatic design
  • Polishing and gun assembly
  • High voltage conditioning

Repeated experimental and numerical simulation results of the space charge dominated magnetized electron beam with the new photogun

Summary and Conclusions

Return to Sajini Wijethunga