Difference between revisions of "Thesis work"
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| Line 8: | Line 8: | ||
| − | + | ==Introduction== | |
* ''Magnetized electron beam'' | * ''Magnetized electron beam'' | ||
* ''Applications of the magnetized electron beam'' | * ''Applications of the magnetized electron beam'' | ||
| Line 15: | Line 15: | ||
| − | + | ==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 matrix'' | *''Beam matrix'' | ||
*''Phase space'' | *''Phase space'' | ||
| Line 28: | Line 28: | ||
| − | + | ==Space charge effect== | |
*''Space charge effect in the magnetized beam'' | *''Space charge effect in the magnetized beam'' | ||
| − | + | ==Simulations on the magnetized electron beam== | |
*''ASTRA'' | *''ASTRA'' | ||
**''Initial particle distribution'' | **''Initial particle distribution'' | ||
| Line 44: | Line 44: | ||
*''Post-processing (MATLAB)'' | *''Post-processing (MATLAB)'' | ||
| − | + | ==Characterization of the magnetized beam== | |
*''Experimental method'' | *''Experimental method'' | ||
**''Beam size vs solenoid I'' | **''Beam size vs solenoid I'' | ||
| Line 54: | Line 54: | ||
| − | + | ==Experiments and numerical simulations of the space charge dominated magnetized beam== | |
*''Experimental methods'' | *''Experimental methods'' | ||
**''Pulse energy vs extracted charge -for different magnetizations'' | **''Pulse energy vs extracted charge -for different magnetizations'' | ||
| Line 64: | Line 64: | ||
| − | + | ==Redesigning and performance of the photogun== | |
*''Gun designing'' | *''Gun designing'' | ||
**''CST electrostatic design'' | **''CST electrostatic design'' | ||
| Line 73: | Line 73: | ||
| − | + | ==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 00:03, 29 May 2020
Oral Qualifying Exam-March 2019
Annual review-May 2020
Thesis Outline
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 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)
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