Difference between revisions of "Thesis outline"

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Line 4: Line 4:
 
** ''Magnetized electron cooling''
 
** ''Magnetized electron cooling''
 
* ''Jefferson Lab magnetized electron source for the JLEIC cooler''
 
* ''Jefferson Lab magnetized electron source for the JLEIC cooler''
 
  
 
==Generation of the magnetized electron beam==
 
==Generation of the magnetized electron beam==
 
*''Experimental setup (DC HV gun, photocathode, cathode solenoid, RF laser, focusing solenoids, etc.)''
 
*''Experimental setup (DC HV gun, photocathode, cathode solenoid, RF laser, focusing solenoids, etc.)''
 
*''Beam diagnostics''
 
*''Beam diagnostics''
 
  
 
==Beam dynamics==
 
==Beam dynamics==
Line 17: Line 15:
 
*''Effective(drift) emittance (emittance of the magnetized beam)''
 
*''Effective(drift) emittance (emittance of the magnetized beam)''
 
*''Measuring the beam emittance''
 
*''Measuring the beam emittance''
 
  
 
==Space charge effect==
 
==Space charge effect==
Line 43: Line 40:
 
===''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==
Line 53: Line 49:
 
===''GPT simulations''===
 
===''GPT simulations''===
 
*''Conclusions (Comparison-measurements and simulations)''
 
*''Conclusions (Comparison-measurements and simulations)''
 
  
 
==Redesigning and performance of the photogun==  
 
==Redesigning and performance of the photogun==  
Line 60: Line 55:
 
*''Polishing and gun assembly''
 
*''Polishing and gun assembly''
 
*''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 simulations results of the space charge dominated magnetized beam with the new photogun ==
  
 +
==Summary and Conclusions==
  
==Summary and Conclusions==
 
  
 +
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  
 
[[Sajini Wijethunga | Return to Sajini Wijethunga]]
 
[[Sajini Wijethunga | Return to Sajini Wijethunga]]

Revision as of 02:20, 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 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 simulations results of the space charge dominated magnetized beam with the new photogun

Summary and Conclusions


Return to Sajini Wijethunga