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Theory of wakefields in a dielectric-lined waveguide
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.
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.
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.
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.