Difference between revisions of "Thesis work"
| Line 9: | Line 9: | ||
== Introduction == | == Introduction == | ||
| − | + | Magnetized electron beam | |
| − | + | Applications of the magnetized electron beam | |
| − | + | Electron cooling of ion beam | |
Jefferson Lab magnetized electron beam for the JLEIC cooler | Jefferson Lab magnetized electron beam for the JLEIC cooler | ||
| Line 17: | Line 17: | ||
== Generation of the magnetized electron beam == | == Generation of the magnetized electron beam == | ||
| − | + | Experimental setup (DC HV gun, photo cathode, RF laser, solenoid, 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) | |
| − | + | ||
| − | 7 Experiments | + | == 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.) | |
| − | + | ||
| − | + | ||
| − | + | 7 Experiments a | |
| − | + | == Headline text == | |
| − | + | nd 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) … | ||
| + | |||
| + | |||
| + | == Redesiging 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 | ||
| + | |||
| + | |||
| + | |||
| + | == 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 17:03, 28 May 2020
Oral Qualifying Exam-March 2019
Annual review-May 2020
Thesis Outline
Introduction
Magnetized electron beam Applications of the magnetized electron beam Electron cooling of ion beam Jefferson Lab magnetized electron beam for the JLEIC cooler
Generation of the magnetized electron beam
Experimental setup (DC HV gun, photo cathode, RF laser, solenoid, 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.)
7 Experiments a
Headline text
nd 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) …
Redesiging 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