Publication Date

2021

Document Type

Dissertation/Thesis

First Advisor

Piot, Philippe

Degree Name

Ph.D. (Doctor of Philosophy)

Legacy Department

Department of Physics

Abstract

High brightness electron beams are an essential component that drives current and future accelerators and accelerator-based light sources including Free-Electron lasers (FELs), electron cooling experiments, and compact ultrafast electron probe setups (e.g. ultrafast electron diffraction). In FEL, the possible use of a superconducting radiofrequency (SRF) electron gun to support the generation of high-repetition-rate bright-beam can produce copious amounts of radiation over a broad range of the electromagnetic spectrum which can be used in several scientific experiments while in electron probes, the use of SRF gun can enable the generation of high brightness electron beams at high repetition rates, e.g., necessary to obtain diffraction patterns with simplified setups that can be operated in small laboratories.

In this work, we discuss the generation of electron beams with high average current and high brightness electron beams. The former is achieved via the quantum mechanical tunneling of electrons in Field Emission (FE) while the latter is achieved via laser-induced phot-emitted electrons.

We present the design and test of a DC electron gun capable of testing FE cathodes at NIU. We show the design of a footprint accelerator based on SRF technology coupled with state-of-the-art conduction cooling. We present thermal, electromagnetic, and beam-dynamics simulations that support the feasibility of the design. Furthermore, we explore the optimization of the proposed design via FE and photoemission electron sources with possible industrial and scientific applications. We also show the recent result of a proof-of-principle experiment that confirmed some of the expected properties of the design. Finally, we discuss the result of optimizing an SRF photoinjector with a quarter-wave resonator (QWR) cavity to generate high-repetition-rate bunches with superior brightness that can be used in future FELs.

Extent

174 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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