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  
      Electron cooling of ion beam
+
Electron cooling of ion beam
 
Jefferson Lab magnetized electron beam for the JLEIC cooler
 
Jefferson Lab magnetized electron beam for the JLEIC cooler
  
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== Generation of the magnetized electron beam ==
 
== Generation of the magnetized electron beam ==
 
   
 
   
    2.1 Experimental setup (DC HV gun, photo cathode, RF laser, solenoid, etc.)
+
Experimental setup (DC HV gun, photo cathode, RF laser, solenoid, etc.)
    2.2 Beam diagnostics
+
Beam diagnostics
3 Beam dynamics  
+
 
3.1 Beam matrix
+
 
3.2 Phase space
+
== Beam dynamics ==
3.3 Emittance (thermal, phase space, geometric)
+
3.4 Effective(drift) emittance (emittance of the magnetized beam)
+
Beam matrix
3.5 Measuring the beam emittance
+
Phase space
4 Space charge effect
+
Emittance (thermal, phase space, geometric)
4.1 Space charge effect in magnetized beam
+
Effective(drift) emittance (emittance of the magnetized beam)
5 Simulations on the magnetized electron beam
+
Measuring the beam emittance
5.1 ASTRA
+
 
        5.1.1 Initial particle distribution  
+
 
        5.1.2 Field maps (3D E field map, 2D B field map)
+
== Space charge effect ==
        5.1.3 Space charge calculation mechanism
+
 
        5.1.4 Emittance
+
Space charge effect in the magnetized beam
5.2 GPT
+
 
        5.1.1 Initial particle distribution (Laser*QE image processing)
+
== Simulations on the magnetized electron beam ==
        5.1.2 Field maps (3D E field map, 2D B field map)
+
 
        5.1.3 Space charge calculation mechanism
+
ASTRA
        5.1.4 Emittance
+
Initial particle distribution  
5.3 Post processing (MATLAB)
+
Field maps (3D E field map, 2D B field map)
6 Experiments and numerical simulations of the magnetized beam with no space charge
+
Space charge calculation mechanism
6.1 Experimental method  
+
Emittance
      6.1.1 Beam size vs solenoid I - on axis beam
+
GPT
      6.1.2 Rotation angle vs solenoid I -on axis beam
+
Initial particle distribution (Laser*QE image processing)
      6.1.3 Emittance vs solenoid I - two different laser sizes  
+
Field maps (3D E field map, 2D B field map)
      6.1.4 Emittance vs laser spot sizes - max solenoid current  
+
Space charge calculation mechanism
        6.2 ASTRA/GPT simulations  
+
Emittance
                (Simulation of all the above variations)  
+
Post-processing (MATLAB)
6.3 Conclusions (comparisons -measurements vs simulations, mismatch oscillations, negative rotation angles, etc.)
+
 
7 Experiments and numerical simulations of the magnetized beam with space charge on
+
== Characterization of the magnetized beam ==
  7.1 Experimental methods  
+
 
      7.1.1 Pulse energy vs extracted charge -for different magnetizations
+
Experimental method  
      7.1.2 Space charge current limitation dependence on gun high voltage- for different  magnetizations
+
Beam size vs solenoid I
      7.1.3 Space charge current limitation dependence on pulse width- for different magnetizations
+
Rotation angle vs solenoid I  
        7.1.4 Space charge current limitation dependence on laser spot size- for different magnetizations
+
Emittance vs solenoid I - two different laser sizes  
        7.2 GPT simulations
+
Emittance vs laser spot sizes - max solenoid current  
      7.2.1 …
+
ASTRA/GPT simulations (Simulation of all the above variations)  
7.3 Conclusions (Comparison -measurements and simulations) …
+
Conclusions (comparisons -measurements vs simulations, mismatch oscillations, negative rotation angles, etc.)
8 Remodeling and performance of the photogun
+
 
  8.1 Gun designing  
+
 
      8.1.1 CST electrostatic design
+
7 Experiments a
      8.1.2 GPT simulations implementing the new gun field map
+
== Headline text ==
        8.2 Polishing and gun assembly
+
nd numerical simulations of the space charge dominated magnetized beam  
8.3 High voltage conditioning
+
Experimental methods  
9 Repeated experimental and numerical simulations results of the magnetized beam with space charge on with the new photogun
+
Pulse energy vs extracted charge -for different magnetizations
10 Conclusions
+
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  
 +
CST electrostatic design
 +
GPT simulations implementing the new gun field map
 +
Polishing and gun assembly
 +
High voltage conditioning
 +
 
 +
 
 +
 
 +
== Repeated experimental and numerical simulations results of the space charge dominated magnetized beam with the new photogun ==
 +
 
 +
 
 +
== Conclusions ==
 +
 
  
 
[[Sajini Wijethunga | Return to Sajini Wijethunga]]
 
[[Sajini Wijethunga | Return to Sajini Wijethunga]]

Revision as of 16:03, 28 May 2020

Oral Qualifying Exam-March 2019

Annual review-May 2020

Thesis Outline

Introduction

Magnetized electron beam Applications of the magnetized electron beam Electron cooling of ion beam Jefferson Lab magnetized electron beam for the JLEIC cooler


Generation of the magnetized electron beam

Experimental setup (DC HV gun, photo cathode, RF laser, solenoid, 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.)


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) …


Redesiging 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


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

Conclusions

Return to Sajini Wijethunga