Difference between revisions of "Thesis outline"
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==Redesigning and performance of the photogun== | ==Redesigning and performance of the photogun== | ||
| − | *'' | + | *''Existing electrostatic design'' |
| − | + | *''Modified electrostatic design'' | |
| − | |||
*''Polishing and gun assembly'' | *''Polishing and gun assembly'' | ||
*''High voltage conditioning'' | *''High voltage conditioning'' | ||
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| − | ==Conclusions== | + | ==Summary and Conclusions== |
[[Sajini Wijethunga | Return to Sajini Wijethunga]] | [[Sajini Wijethunga | Return to Sajini Wijethunga]] | ||
Revision as of 00:15, 29 May 2020
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
- Existing electrostatic design
- Modified electrostatic design
- Polishing and gun assembly
- High voltage conditioning