Ph.D. (Doctor of Philosophy)
Department of Physics
Over the years, particle accelerators have enabled breakthroughs in fundamental science while also becoming critical tools in medicine, homeland security, and societal applications. High-brightness electron beams are a key to the development of some of these accelerators and especially accelerator-based light sources. Electron emission is the first stage of the accelerator that dictates the ultimate beam brightness. To achieve such beam quality, electron sources--cathodes have been developed for their emission efficiencies. The cathodes with nanostructures on their surfaces have shown promising efficiencies when a laser pulse impinges, or an electric field is applied, on the cathode surface. Alternatively, these nano-patterned cathodes could support the formation of a multi-beamlet beam. % or structured beams composed of transversely-separated beamlets.
Numerical simulations of the emission processes from nano-structured cathodes and to the subsequent acceleration to relativistic energies are performed by using a combination of particle-tracking programs. The simulations are used to investigate the properties of beams emitted from the cathodes and especially the preservation of the beam features imparted during the emission process. To explore the imaging of cathode pattern after acceleration and manipulation between, e.g., different degrees of freedom. The applications to these capabilities to novel light sources are finally examined.
Lueangaramwong, Anusorn, "Study of Electron Beam Emitted from Nano-Structured Cathode" (2019). Graduate Research Theses & Dissertations. 7380.
Northern Illinois University
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