Difference between revisions of "Thesis work"

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=Oral Qualifying Exam-March 2019=
 
  
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=Annual review-May 2020=
 
  
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=Thesis Outline=
 
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1 Introduction
 
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    1.1 Magnetized electron beam
 
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    1.2 Applications of the magnetized electron beam
 
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          1.2.1 Electron cooling of ion beam
 
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    1.3 Jefferson Lab magnetized electron beam for the JLEIC cooler
 
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2 Generation of the magnetized electron beam
 
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    2.1 Experimental setup (DC HV gun, photo cathode, RF laser, solenoid, etc.)
 
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    2.2 Beam diagnostics
 
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3 Beam dynamics
 
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3.1 Beam matrix
 
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3.2 Phase space
 
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3.3 Emittance (thermal, phase space, geometric)
 
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3.4 Effective(drift) emittance (emittance of the magnetized beam)
 
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3.5 Measuring the beam emittance
 
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4 Space charge effect
 
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4.1 Space charge effect in magnetized beam
 
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5 Simulations on the magnetized electron beam
 
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5.1 ASTRA
 
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        5.1.1 Initial particle distribution
 
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        5.1.2 Field maps (3D E field map, 2D B field map)
 
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        5.1.3 Space charge calculation mechanism
 
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        5.1.4 Emittance
 
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5.2 GPT
 
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        5.1.1 Initial particle distribution (Laser*QE image processing)
 
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        5.1.2 Field maps (3D E field map, 2D B field map)
 
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        5.1.3 Space charge calculation mechanism
 
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        5.1.4 Emittance
 
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5.3 Post processing (MATLAB)
 
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6 Experiments and numerical simulations of the magnetized beam with no space charge
 
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6.1 Experimental method
 
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      6.1.1 Beam size vs solenoid I - on axis beam
 
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      6.1.2 Rotation angle vs solenoid I -on axis beam
 
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      6.1.3 Emittance vs solenoid I - two different laser sizes
 
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      6.1.4 Emittance vs laser spot sizes - max solenoid current
 
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        6.2 ASTRA/GPT simulations
 
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                (Simulation of all the above variations)
 
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6.3 Conclusions (comparisons -measurements vs simulations, mismatch oscillations, negative rotation angles, etc.)
 
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7 Experiments and numerical simulations of the magnetized beam with space charge on
 
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  7.1 Experimental methods
 
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      7.1.1 Pulse energy vs extracted charge -for different magnetizations
 
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      7.1.2 Space charge current limitation dependence on gun high voltage- for different  magnetizations
 
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      7.1.3 Space charge current limitation dependence on pulse width- for different magnetizations
 
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        7.1.4 Space charge current limitation dependence on laser spot size- for different magnetizations
 
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        7.2 GPT simulations
 
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      7.2.1 …
 
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7.3 Conclusions (Comparison -measurements and simulations) …
 
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8 Remodeling and performance of the photogun
 
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  8.1 Gun designing
 
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      8.1.1 CST electrostatic design
 
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      8.1.2 GPT simulations implementing the new gun field map
 
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        8.2 Polishing and gun assembly
 
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8.3 High voltage conditioning
 
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9 Repeated experimental and numerical simulations results of the magnetized beam with space charge on with the new photogun
 
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10 Conclusions
 
  
 
[[Sajini Wijethunga | Return to Sajini Wijethunga]]
 
[[Sajini Wijethunga | Return to Sajini Wijethunga]]

Latest revision as of 00:35, 29 May 2020


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