Difference between revisions of "Thesis work"

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(Replaced content with "=Oral Qualifying Exam-March 2019= =Annual review-May 2020= Return to Sajini Wijethunga")
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=Annual review-May 2020=
 
=Annual review-May 2020=
 
=Thesis Outline=
 
 
 
 
 
==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==
 
*''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 01:21, 29 May 2020

Oral Qualifying Exam-March 2019

Annual review-May 2020

Return to Sajini Wijethunga