Difference between revisions of "Thesis work"

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# Introduction  
 
# Introduction  
 
 
* ''Magnetized electron beam''
 
* ''Magnetized electron beam''
 
* ''Applications of the magnetized electron beam''
 
* ''Applications of the magnetized electron beam''
* ''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, photo cathode, RF laser, solenoid, etc.)
+
*''Experimental setup (DC HV gun, photocathode, cathode solenoid, RF laser, focusing solenoids, etc.)''
##Beam diagnostics
+
*''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 ==
+
# Beam dynamics
 +
*''Beam matrix''
 +
*''Phase space''
 +
*''Emittance (thermal, phase space, geometric)''
 +
*''Effective(drift) emittance (emittance of the magnetized beam)''
 +
*''Measuring the beam emittance''
  
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 ==
+
# Space charge effect
 +
*''Space charge effect in the magnetized beam''
  
Experimental method
+
# Simulations on the magnetized electron beam
Beam size vs solenoid I
+
*''ASTRA''
Rotation angle vs solenoid I
+
**''Initial particle distribution''
Emittance vs solenoid I - two different laser sizes
+
**''Field maps (3D E field map, 2D B field map)''
Emittance vs laser spot sizes - max solenoid current
+
**''Space charge calculation mechanism''
ASTRA/GPT simulations (Simulation of all the above variations)  
+
**''Emittance''
Conclusions (comparisons -measurements vs simulations, mismatch oscillations, negative rotation angles, etc.)
+
*''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.)''
  
7 Experiments a
 
== Headline text ==
 
nd 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) …
 
  
 +
# 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)''
  
== Redesiging and performance of the photogun ==
 
  
Gun designing  
+
#Redesigning and performance of the photogun
CST electrostatic design
+
*''Gun designing''
GPT simulations implementing the new gun field map
+
**''CST electrostatic design''
Polishing and gun assembly
+
**''GPT simulations implementing the new gun field map''
High voltage conditioning
+
*''Polishing and gun assembly''
 +
*''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 ==
  
  
== Conclusions ==
+
#Conclusions  
  
  
 
[[Sajini Wijethunga | Return to Sajini Wijethunga]]
 
[[Sajini Wijethunga | Return to Sajini Wijethunga]]

Revision as of 00:59, 29 May 2020

Oral Qualifying Exam-March 2019

Annual review-May 2020

Thesis Outline

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


  1. Generation of the magnetized electron beam
  • Experimental setup (DC HV gun, photocathode, cathode solenoid, RF laser, focusing solenoids, etc.)
  • Beam diagnostics


  1. Beam dynamics
  • Beam matrix
  • Phase space
  • Emittance (thermal, phase space, geometric)
  • Effective(drift) emittance (emittance of the magnetized beam)
  • Measuring the beam emittance


  1. Space charge effect
  • Space charge effect in the magnetized beam
  1. 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)
  1. 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.)


  1. 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)


  1. Redesigning and performance of the photogun
  • Gun designing
    • CST electrostatic design
    • GPT simulations implementing the new gun field map
  • Polishing and gun assembly
  • High voltage conditioning


  1. Repeated experimental and numerical simulations results of the space charge dominated magnetized beam with the new photogun ==


  1. Conclusions


Return to Sajini Wijethunga