Electrical and Computer Engineering ETDs

Publication Date

Fall 11-8-2019

Abstract

A metamaterial (MTM) high power microwave (HPM) vacuum electron device (VED) was developed using 3D printing technology. The specific geometric pattern of the source can produce both negative permittivity and permeability to interact with a relativistic electron beam. The electron beam is generated using a pulsed electron accelerator with a maximum energy of 700 keV and lasting approximately 16 ns. The design of this novel VED consists of a circular waveguide loaded with complementary split-ring resonators in a linear periodic arrangement in which the relativistic beam travels guided by a magnetic field. The electrons interact with the MTM producing electromagnetic radiation, which is radiated to free space using a horn antenna. The HPM signal generated is characterized using a resistive sensor detector and a waveguide detector connected to a crystal diode. The radiation field distribution was measured using these detectors. Mode characterization is facilitated using an array of neon bulbs, which light up according to the intensity of the electric field. As a result, this excitation resembles the field pattern generated by the VED. The experimental results are compared with particle-in-cell (PIC) simulations and theoretical considerations.

Keywords

High-power microwaves, slow wave structure, metamaterials, backward wave oscillators, electrical breakdown, mode characterization

Sponsors

AFOSR MURI Grant FA9550-12-1-0489

Document Type

Thesis

Language

English

Degree Name

Electrical Engineering

Level of Degree

Masters

Department Name

Electrical and Computer Engineering

First Committee Member (Chair)

Dr. Edl Schamiloglu

Second Committee Member

Dr. Mark Gilmore

Third Committee Member

Dr. Ahmed Elfrgani

Third Advisor

Dr Claudio Costa Motta

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