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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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| − | == Introduction ==
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| − | Magnetized electron beam
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| − | Applications of the magnetized electron beam
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| − | Electron cooling of ion beam
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| − | Jefferson Lab magnetized electron beam for the JLEIC cooler
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| − | == 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
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| | [[Sajini Wijethunga | Return to Sajini Wijethunga]] | | [[Sajini Wijethunga | Return to Sajini Wijethunga]] |
