# 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 16:03, 28 May 2020

## Contents

- 1 Oral Qualifying Exam-March 2019
- 2 Annual review-May 2020
- 3 Thesis Outline
- 3.1 Introduction
- 3.2 Generation of the magnetized electron beam
- 3.3 Beam dynamics
- 3.4 Space charge effect
- 3.5 Simulations on the magnetized electron beam
- 3.6 Characterization of the magnetized beam
- 3.7 Headline text
- 3.8 Redesiging and performance of the photogun
- 3.9 Repeated experimental and numerical simulations results of the space charge dominated magnetized beam with the new photogun
- 3.10 Conclusions

# 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