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Related Experiment Videos

Theory of wakefields in a dielectric-lined waveguide

Park1, Hirshfield

  • 1Department of Physics, Yale University, P.O. Box 208120, New Haven, Connecticut 06520-8120 and Omega-P, Incorporated, Suite 100, 345 Whitney Avenue, New Haven, Connecticut 06511, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|November 23, 2000
PubMed
Summary

Researchers analyzed wakefields generated by charged particle bunches in dielectric-lined waveguides, finding potential for high-gradient particle acceleration. This study advances understanding of Cerenkov radiation in bounded systems for future accelerator designs.

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Area of Science:

  • Plasma Physics and Accelerator Science
  • Electromagnetism and Wave Propagation

Background:

  • Analysis of wakefield excitation in dielectric-lined cylindrical waveguides.
  • Exploration of Cerenkov radiation within a transversely bounded system.

Purpose of the Study:

  • To derive and analyze wakefields generated by short charge bunches.
  • To investigate the generation of dipole modes and potential instabilities.
  • To examine Poynting's theorem for radiation power calculation in this system.

Main Methods:

  • Expansion of wakefields into orthonormal hybrid electric-magnetic eigenfunctions.
  • Derivation of orthonormalization relations for stationary and moving sources.
  • Calculation of wakefield forces and examination of Poynting's theorem.

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Main Results:

  • Orthonormalization relations for wakefields are derived for the first time.
  • Non-axisymmetric bunch distributions generate significant dipole modes.
  • Radiation power flows opposite to the charge bunch direction.
  • A peak accelerating gradient of 155 MeV/m is predicted for specific parameters.

Conclusions:

  • Dielectric-lined waveguides can generate high accelerating gradients.
  • This technology holds promise for future high-gradient electron/positron linear accelerators.
  • Further research requires availability of low-emittance, high-current, ultrashort electron bunches.