Dissertation/Thesis Abstract

Thermionic Emission vs Field Emission for Non-relativistic Electron Guns
by Johnson, Tegan Lisbeth, M.S., Indiana University, 2019, 56; 13810062
Abstract (Summary)

Electron gun design as a whole is a well-studied field, but little research has been done at very low energies, and even less research has been done for asymmetric reentrant cavity designs. Electron guns operating at lower energies require less power and are more efficient, with less ohmic heating. This thesis presents the results of simulated performances of asymmetrical electron gun cathode cavities optimized for shunt impedance and operation at non-relativistic energies. Cavity performance includes current density output, comparing thermionic emission to field emission. An existing Mathematica code for optimizing symmetric cavities at relativistic energies was enhanced for this analysis. For an asymmetric elliptical reentrant cavity designed for 100keV exit energy, with a shunt impedance of 147 MΩ/m: thermionic emission achieved a peak current density of 0.08 A/cm2, while field emission produced of 1.54 A/cm 2.

Indexing (document details)
Advisor: Snow, William M.
Commitee: Baxter, David V., Nanni, Emilio A., Snow, William M.
School: Indiana University
Department: Physics
School Location: United States -- Indiana
Source: MAI 58/05M(E), Masters Abstracts International
Subjects: Physics
Keywords: Accelerator, Asymmetric, Electron gun, Emission, RF cavity, Shunt impedance
Publication Number: 13810062
ISBN: 978-1-392-02341-9
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