Difference between revisions of "Thesis work"

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=Oral Qualifying Exam-March 2019=
 
  
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=Annual review-May 2020=
 
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=Thesis Outline=
 
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==Introduction==
 
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* ''Magnetized electron beam''
 
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* ''Applications of the magnetized electron beam''
 
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** ''Magnetized electron cooling''
 
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* ''Jefferson Lab magnetized electron source for the JLEIC cooler''
 
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==Generation of the magnetized electron beam==
 
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*''Experimental setup (DC HV gun, photocathode, cathode solenoid, RF laser, focusing solenoids, etc.)''
 
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*''Beam diagnostics''
 
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==Beam dynamics==
 
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*''Beam matrix''
 
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*''Phase space''
 
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*''Emittance (thermal, phase space, geometric)''
 
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*''Effective(drift) emittance (emittance of the magnetized beam)''
 
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*''Measuring the beam emittance''
 
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==Space charge effect==
 
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*''Space charge effect in the magnetized beam''
 
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==Simulations on the magnetized electron beam==
 
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*''ASTRA''
 
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**''Initial particle distribution''
 
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**''Field maps (3D E field map, 2D B field map)''
 
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**''Space charge calculation mechanism''
 
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**''Emittance''
 
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*''GPT''
 
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**''Initial particle distribution (Laser*QE image processing)''
 
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**''Field maps (3D E field map, 2D B field map)''
 
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**''Space charge calculation mechanism''
 
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**''Emittance''
 
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*''Post-processing (MATLAB)''
 
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==Characterization of the magnetized beam==
 
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*''Experimental method''
 
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**''Beam size vs solenoid I''
 
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**''Rotation angle vs solenoid I''
 
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**''Emittance vs solenoid I - two different laser sizes''
 
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**''Emittance vs laser spot sizes - max solenoid current''
 
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*''ASTRA/GPT simulations (Simulation of all the above variations)''
 
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*''Conclusions (comparisons -measurements vs simulations, mismatch oscillations, negative rotation angles, etc.)''
 
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==Experiments and numerical simulations of the space charge dominated magnetized beam==
 
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*''Experimental methods''
 
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**''Pulse energy vs extracted charge -for different magnetizations''
 
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**''Space charge current limitation dependence on gun high voltage - for different magnetizations''
 
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**''Space charge current limitation dependence on pulse width- for different magnetizations''
 
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**''Space charge current limitation dependence on laser spot size- for different magnetizations''
 
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*''GPT simulations''
 
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*''Conclusions (Comparison -measurements and simulations)''
 
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==Redesigning and performance of the photogun==
 
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*''Gun designing''
 
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**''CST electrostatic design''
 
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**''GPT simulations implementing the new gun field map''
 
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*''Polishing and gun assembly''
 
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*''High voltage conditioning''
 
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==Repeated experimental and numerical simulations results of the space charge dominated magnetized beam with the new photogun ==
 
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==Conclusions==
 
  
  
 
[[Sajini Wijethunga | Return to Sajini Wijethunga]]
 
[[Sajini Wijethunga | Return to Sajini Wijethunga]]

Latest revision as of 00:35, 29 May 2020


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