Difference between revisions of "Thesis outline"
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| Line 4: | Line 4: | ||
** ''Magnetized electron cooling'' | ** ''Magnetized electron cooling'' | ||
* ''Jefferson Lab magnetized electron source for the JLEIC cooler'' | * ''Jefferson Lab magnetized electron source for the JLEIC cooler'' | ||
| − | |||
==Generation of the magnetized electron beam== | ==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 dynamics== | ||
| Line 17: | Line 15: | ||
*''Effective(drift) emittance (emittance of the magnetized beam)'' | *''Effective(drift) emittance (emittance of the magnetized beam)'' | ||
*''Measuring the beam emittance'' | *''Measuring the beam emittance'' | ||
| − | |||
==Space charge effect== | ==Space charge effect== | ||
| Line 43: | Line 40: | ||
===''ASTRA/GPT simulations (Simulation of all the above variations)''=== | ===''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== | ||
| Line 53: | Line 49: | ||
===''GPT simulations''=== | ===''GPT simulations''=== | ||
*''Conclusions (Comparison-measurements and simulations)'' | *''Conclusions (Comparison-measurements and simulations)'' | ||
| − | |||
==Redesigning and performance of the photogun== | ==Redesigning and performance of the photogun== | ||
| Line 60: | Line 55: | ||
*''Polishing and gun assembly'' | *''Polishing and gun assembly'' | ||
*''High voltage conditioning'' | *''High voltage conditioning'' | ||
| − | |||
| − | |||
==Repeated experimental and numerical simulations results of the space charge dominated magnetized beam with the new photogun == | ==Repeated experimental and numerical simulations results of the space charge dominated magnetized beam with the new photogun == | ||
| + | ==Summary and Conclusions== | ||
| − | |||
| + | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ||
[[Sajini Wijethunga | Return to Sajini Wijethunga]] | [[Sajini Wijethunga | Return to Sajini Wijethunga]] | ||
Revision as of 02:20, 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 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