Difference between revisions of "Thesis outline"
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| Line 13: | Line 13: | ||
*''Phase space'' | *''Phase space'' | ||
*''Emittance (thermal, phase space, geometric)'' | *''Emittance (thermal, phase space, geometric)'' | ||
| − | *''Effective(drift) emittance (emittance of | + | *''Effective(drift) emittance (emittance of a magnetized beam)'' |
| − | *''Measuring the beam emittance'' | + | *''Measuring/calculating the beam emittance'' |
==Space charge effect== | ==Space charge effect== | ||
| − | *''Space charge effect in | + | *''Space charge effect in a magnetized electron beam'' |
==Simulations on the magnetized electron beam== | ==Simulations on the magnetized electron beam== | ||
===''ASTRA''=== | ===''ASTRA''=== | ||
| − | + | *''Initial particle distribution'' | |
| − | + | *''Field maps (3D E field map, 2D B field map)'' | |
| − | + | *''Space charge calculation mechanism'' | |
| − | + | *''Emittance'' | |
===''GPT''=== | ===''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)''=== | ===''Post-processing (MATLAB)''=== | ||
| − | ==Characterization of the magnetized beam== | + | ==Characterization of the magnetized electron beam== |
===''Experimental method''=== | ===''Experimental method''=== | ||
| − | + | *''Beam size vs solenoid I'' | |
| − | + | *''Rotation angle vs solenoid I'' | |
| − | + | *''Emittance vs solenoid I - three different laser sizes'' | |
| − | + | *''Emittance vs laser spot sizes - max solenoid current'' | |
| − | ===''ASTRA/GPT simulations ( | + | ===''ASTRA/GPT simulations (Simulations of all the above variations)''=== |
*''Conclusions (comparisons -measurements vs simulations, mismatch oscillations, negative rotation angles, etc.)'' | *''Conclusions (comparisons -measurements vs simulations, mismatch oscillations, negative rotation angles, etc.)'' | ||
| − | == | + | ==Experimental and numerical simulation results of the space charge dominated magnetized electron beam== |
===''Experimental method''=== | ===''Experimental method''=== | ||
| − | + | *''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''=== | ===''GPT simulations''=== | ||
*''Conclusions (Comparison-measurements and simulations)'' | *''Conclusions (Comparison-measurements and simulations)'' | ||
| Line 56: | Line 56: | ||
*''High voltage conditioning'' | *''High voltage conditioning'' | ||
| − | ==Repeated experimental and numerical | + | ==Repeated experimental and numerical simulation results of the space charge dominated magnetized electron beam with the new photogun == |
==Summary and Conclusions== | ==Summary and Conclusions== | ||
| − | |||
| − | |||
[[Sajini Wijethunga | Return to Sajini Wijethunga]] | [[Sajini Wijethunga | Return to Sajini Wijethunga]] | ||
Latest revision as of 11:11, 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 a magnetized beam)
- Measuring/calculating the beam emittance
Space charge effect
- Space charge effect in a magnetized electron 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 electron beam
Experimental method
- Beam size vs solenoid I
- Rotation angle vs solenoid I
- Emittance vs solenoid I - three different laser sizes
- Emittance vs laser spot sizes - max solenoid current
ASTRA/GPT simulations (Simulations of all the above variations)
- Conclusions (comparisons -measurements vs simulations, mismatch oscillations, negative rotation angles, etc.)
Experimental and numerical simulation results of the space charge dominated magnetized electron beam
Experimental method
- 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