Publication Date
2025
Document Type
Dissertation/Thesis
First Advisor
Chubenko, Oksana
Degree Name
M.S. (Master of Science)
Legacy Department
Department of Physics
Abstract
Research and development of new photocathode materials are essential to the continuing success and productivity of accelerator technology. High-quality photocathodes characterized by high quantum efficiencies, long lifetimes, low mean transverse energies, and robustness to vacuum environments and operation loads are becoming increasingly essential to the successful operation of the next generation of high brightness accelerator applications. For nuclear and high-energy physics experiments and other applications that rely on spin-polarized electron beams, photocathodes must also demonstrate high electron spin polarizations. The development of state of-the-art spin-polarized photocathodes will require both development of methods to improve the quality of already existing cathode materials, and exploration of new photocathode materials and new approaches that go beyond the conventional paradigm of photocathode materials. Photoemission modeling through the Monte Carlo technique can account for environmental and material factors like operation temperature, doping density, surface activation effects, and other phenomena which underly the resulting photoemission properties of the material like quantum efficiency, electron spin polarization and mean transverse energy. A deep understanding of the material and environmental factors that both inhibit and facilitate desirable photoemission properties of conventional spin-polarized electron sources would provide valuable insight for the development of novel photocathodes designed for the next generation of accelerator applications. In this study, Monte Carlo modeling of spin-polarized photoemission from p-doped GaAs has been expanded to incorporate both low-temperature photoemission and modeling surface effects caused by Cs-O2 activation and surface degradation.
Recommended Citation
Callahan, John Rison, "Monte Carlo Modeling of Spin Polarized Photoemission from GaAs at Low Temperatures and Positive Electron Affinity Surfaces" (2025). Graduate Research Theses & Dissertations. 8108.
https://huskiecommons.lib.niu.edu/allgraduate-thesesdissertations/8108
Extent
45 pages
Language
en
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
