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Yoder, R. B.

Paper Title Page
THPMS071 Laser-Powered Dielectric Structure as a Micron-Scale Electron Source 3145
 
  • R. B. Yoder
  • J. B. Rosenzweig, G. Travish
    UCLA, Los Angeles, California
  
  We describe a resonant laser-powered structure, measuring 1 mm or less in every dimension, that is capable of generating and accelerating electron beams to low energies (~1-2 MeV). Like several other recently investigated dielectric-based accelerators,* the device is planar and resonantly excited with a side-coupled laser; however, extensive modifications are necessary for synchronous acceleration and focusing of nonrelativistic particles. Electrons are generated within the device via a novel ferroelectric-based cathode. The accelerator is constructed from dielectric material using conventional microfabrication techniques and powered by a 1μm gigawatt-class laser. The electron beams produced are suitable for a number of existing industrial and medical applications.

*R. Yoder and J. Rosenzweig, Phys. Rev. STAB 8, 111301 (2005); Z. Zhang et al., Phys. Rev. STAB 8, 071302 (2005); A. Mizrahi and L. Schachter, Phys. Rev. E 70, 016505 (2004).

 
THPMS015 Observation of Multi-GeV Breakdown Thresholds in Dielectric Wakefield Structures 3026
 
  • M. C. Thompson, H. Badakov, J. B. Rosenzweig, M. C. Thompson, G. Travish
    UCLA, Los Angeles, California
  • M. J. Hogan, R. Ischebeck, N. A. Kirby, R. Siemann, D. R. Walz
    SLAC, Menlo Park, California
  • P. Muggli
    USC, Los Angeles, California
  • A. Scott
    UCSB, Santa Barbara, California
  • R. B. Yoder
    Manhattan College, Riverdale, New York
  
  Funding: This work was performed under the auspices of the US Department of Energy under Contracts No. DE-FG03-92ER40693, DE-AC02-76SF00515, W-7405-ENG-48, and DE-FG02-92-ER40745.

The breakdown threshold of a dielectric subjected to the GV/m-scale electric-fields of an intense electron-beam has been measured. In this experiment at the Final Focus Test Beam (FFTB) facility, the 30 GeV SLAC electron beam was focused down and propagated through short fused-silica capillary-tubes with internal diameters of as little as 100 microns. The electric field at the inner surface of the tubes was varied from about 1 GV/m to 22 GV/m by adjusting the longitudinal compression of the electron bunch. The onset of breakdown, as indicated by a bright discharge, was found to correlate to a surface field of about 4 GV/m. An analysis of the damage sustained to the beam-exposed fibers, and its correlation to field amplitude, is also reported.