Difference between revisions of "Thesis outline"
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==Simulations on the magnetized electron beam== | ==Simulations on the magnetized electron beam== | ||
| − | === | + | ===''ASTRA''=== |
**''Initial particle distribution'' | **''Initial particle distribution'' | ||
**''Field maps (3D E field map, 2D B field map)'' | **''Field maps (3D E field map, 2D B field map)'' | ||
**''Space charge calculation mechanism'' | **''Space charge calculation mechanism'' | ||
**''Emittance'' | **''Emittance'' | ||
| − | === | + | ===''GPT''=== |
**''Initial particle distribution (Laser*QE image processing)'' | **''Initial particle distribution (Laser*QE image processing)'' | ||
**''Field maps (3D E field map, 2D B field map)'' | **''Field maps (3D E field map, 2D B field map)'' | ||
**''Space charge calculation mechanism'' | **''Space charge calculation mechanism'' | ||
**''Emittance'' | **''Emittance'' | ||
| − | === | + | ===''Post-processing (MATLAB)''=== |
==Characterization of the magnetized beam== | ==Characterization of the magnetized beam== | ||
| − | === | + | ===''Experimental method''=== |
**''Beam size vs solenoid I'' | **''Beam size vs solenoid I'' | ||
**''Rotation angle vs solenoid I'' | **''Rotation angle vs solenoid I'' | ||
**''Emittance vs solenoid I - two different laser sizes'' | **''Emittance vs solenoid I - two different laser sizes'' | ||
**''Emittance vs laser spot sizes - max solenoid current'' | **''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.)'' | *''Conclusions (comparisons -measurements vs simulations, mismatch oscillations, negative rotation angles, etc.)'' | ||
==Experiments and numerical simulations of the space charge dominated magnetized beam== | ==Experiments and numerical simulations of the space charge dominated magnetized beam== | ||
| − | === | + | ===''Experimental methods''=== |
**''Pulse energy vs extracted charge-for different magnetizations'' | **''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 gun high voltage-for different magnetizations'' | ||
**''Space charge current limitation dependence on pulse width-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'' | **''Space charge current limitation dependence on laser spot size-for different magnetizations'' | ||
| − | === | + | ===''GPT simulations''=== |
*''Conclusions (Comparison-measurements and simulations)'' | *''Conclusions (Comparison-measurements and simulations)'' | ||
Revision as of 00:39, 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