Doctoral Defense - Benjamin Sims

About the Event

Department of Electrical and Computer Engineering

Michigan State University

Monday, January 20, 2025, at 10:00 am EST

2219 Engineering Building - ECE Conference Room and Zoom

Zoom Meeting: https://msu.zoom.us/j/94745663974

Contact Department or Advisor for Zoom Information

ABSTRACT

NOVEL DESIGNS AND PHOTOEMISSION PHYSICS TO ENHANCE BRIGHTNESS OF RF PHOTOINJECTORS

BY: Benjamin Sims

ADVISOR: Dr. Sergey Baryshev

High-brightness injectors are key to improvements in UED, XFELs, and Laser Compton Back Scattering technologies as they increase their resolution, efficiency, and performance when used. Current advancements in cathode technologies and emittance compensation have provided substantial gains in brightness in recent years but additional approaches will be necessary to continue pushing to higher levels of brightness and resulting light source luminosity. 

This dissertation discusses novel practical approaches and designs that can be implemented on various accelerators to improve their brightness. Chapter 2 focused on Space charge emittance and RF emittance management exampled using a canonical injector. Chapter 3 discusses implementing cathode retraction for in-situ intrinsic emittance measurement with the goal of decreasing emittance as well as ensuring desired cathode performance. Chapter 4 explores a novel multimode cavity design that focuses on bunch compression to increase the current of the bunch and thus the brightness. 

Persons with disabilities have the right to request and receive reasonable accommodation. Please call the Department of Electrical and Computer Engineering at 355-5066 at least one day prior to the seminar; requests received after this date will be met when possible.