Thesis work

Thesis Outline

Return to Sajini Wijethunga

1 Introduction

    1.1 Magnetized electron beam
    1.2 Applications of the magnetized electron beam 
          1.2.1 Electron cooling of ion beam
    1.3 Jefferson Lab magnetized electron beam for the JLEIC cooler

2 Generation of the magnetized electron beam

    2.1 Experimental setup (DC HV gun, photo cathode, RF laser, solenoid, etc.)
    2.2 Beam diagnostics

3 Beam dynamics 3.1 Beam matrix 3.2 Phase space 3.3 Emittance (thermal, phase space, geometric) 3.4 Effective(drift) emittance (emittance of the magnetized beam) 3.5 Measuring the beam emittance 4 Space charge effect 4.1 Space charge effect in magnetized beam 5 Simulations on the magnetized electron beam 5.1 ASTRA

       5.1.1 Initial particle distribution 
       5.1.2 Field maps (3D E field map, 2D B field map)
       5.1.3 Space charge calculation mechanism
       5.1.4 Emittance

5.2 GPT

       5.1.1 Initial particle distribution (Laser*QE image processing)
       5.1.2 Field maps (3D E field map, 2D B field map)
       5.1.3 Space charge calculation mechanism
       5.1.4 Emittance

5.3 Post processing (MATLAB) 6 Experiments and numerical simulations of the magnetized beam with no space charge 6.1 Experimental method

      6.1.1 Beam size vs solenoid I - on axis beam 
      6.1.2 Rotation angle vs solenoid I -on axis beam 
      6.1.3 Emittance vs solenoid I - two different laser sizes 
      6.1.4 Emittance vs laser spot sizes - max solenoid current 
       6.2 ASTRA/GPT simulations 
                (Simulation of all the above variations) 

6.3 Conclusions (comparisons -measurements vs simulations, mismatch oscillations, negative rotation angles, etc.) 7 Experiments and numerical simulations of the magnetized beam with space charge on

 7.1 Experimental methods 
      7.1.1 Pulse energy vs extracted charge -for different magnetizations
      7.1.2 Space charge current limitation dependence on gun high voltage- for different   magnetizations
      7.1.3 Space charge current limitation dependence on pulse width- for different magnetizations
       7.1.4 Space charge current limitation dependence on laser spot size- for different magnetizations
        7.2 GPT simulations
      7.2.1 …
7.3 Conclusions (Comparison -measurements and simulations) …

8 Remodeling and performance of the photogun

 8.1 Gun designing 
      8.1.1 CST electrostatic design
      8.1.2 GPT simulations implementing the new gun field map
        8.2 Polishing and gun assembly
8.3 High voltage conditioning

9 Repeated experimental and numerical simulations results of the magnetized beam with space charge on with the new photogun 10 Conclusions