Difference between revisions of "Thesis outline"

From Ciswikidb
Jump to: navigation, search
Line 23: Line 23:
  
 
==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 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 - two 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 (Simulation 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==
 
==Experiments and numerical simulations of the space charge dominated magnetized beam==
*''Experimental methods''
+
===*''Experimental methods''===
 
**''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)''
  

Revision as of 01:38, 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 the magnetized beam)
  • Measuring the beam emittance


Space charge effect

  • Space charge effect in the magnetized 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 beam

*Experimental method

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

*ASTRA/GPT simulations (Simulation of all the above variations)

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


Experiments and numerical simulations of the space charge dominated magnetized beam

*Experimental methods

    • 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 simulations results of the space charge dominated magnetized beam with the new photogun

Summary and Conclusions

Return to Sajini Wijethunga