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Title page for ETD etd-03112009-161102

Type of Document Dissertation
Author Jarvis, Jonathan Daniel
Author's Email Address jonathan.d.jarvis@vanderbilt.edu
URN etd-03112009-161102
Title Development of High-Brightness Electron Sources for Free-Electron Lasers
Degree PhD
Department Physics
Advisory Committee
Advisor Name Title
Charles A. Brau Committee Chair
Jimmy L. Davidson Committee Member
M. Shane Hutson Committee Member
Norman H. Tolk Committee Member
William E. Gabella Committee Member
  • DFEA
  • FEA
  • diamond field-emitter array
  • free-electron laser
  • electron source
  • high-brightness
Date of Defense 2009-02-26
Availability unrestricted
The primary purpose of this thesis is to detail recent progress in the development of high-brightness cathodes for use in beam driven radiation sources. In particular, diamond field-emitter arrays (DFEA) are discussed and their application to conventional free-electron lasers is considered. Topics covered include the successful development of self-limiting uniformity conditioning techniques, measurement and simulation of transverse emittance, and measurement of the emitted electron energy spectrum. DFEAs have demonstrated their rugged nature by providing high per-tip currents, excellent temporal stability, and significant resistance to back-bombardment damage during poor vacuum, close-diode DC operation. Electron gun integration strategies for both gated and ungated

devices are discussed. The Smith-Purcell free-electron laser (SPFEL), a compact terahertz device, is also considered as an application of DFEA technology. The SPFEL is covered in extensive theoretical detail, including two-dimensional, three-dimensional, and three-dimensional confined-mode variations. This theory is used to guide the design of a DFEA driven SPFEL. Experimental configurations for both tabletop and handheld SPFELs are suggested. Additionally, the concept of quantum degeneracy in an electron beam is reviewed and the experimental configuration for a carbon nanotube based quantum-degenerate electron beam source is suggested.

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