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Planar-dielectric-wakefield accelerator structure using Bragg-reflector boundaries.

G Andonian1, O Williams1, S Barber1

  • 1Department of Physics and Astronomy, University of California at Los Angeles (UCLA), Los Angeles, California 90095, USA.

Physical Review Letters
|January 24, 2015
PubMed
Summary
This summary is machine-generated.

Researchers experimentally demonstrated narrow-band, single-mode excitation in a dielectric wakefield accelerator. This advancement in particle acceleration utilizes Bragg-reflector boundaries for enhanced fundamental mode reinforcement.

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Area of Science:

  • Physics
  • Particle Accelerators
  • Electromagnetism

Background:

  • Dielectric wakefield accelerators offer high-gradient acceleration.
  • Controlling excited modes is crucial for efficient beam manipulation.
  • Planar structures with Bragg reflectors present a novel geometry for mode control.

Purpose of the Study:

  • To experimentally measure and characterize narrow-band, single-mode excitation in a planar dielectric wakefield structure.
  • To investigate the role of Bragg-reflector boundaries in reinforcing the fundamental mode.
  • To compare experimental results with 2D and 3D simulations.

Main Methods:

  • Utilizing a short, relativistic electron beam (∼1 ps, ∼100 pC) as a drive beam.
  • Employing a planar dielectric structure with Bragg-reflector boundaries.
  • Analyzing emitted coherent Cherenkov radiation via spectral analysis.
  • Performing 2D and 3D electromagnetic simulations.

Main Results:

  • Experimental confirmation of narrow-band, single-mode excitation at 210 GHz.
  • Demonstration of fundamental mode reinforcement through constructive interference at Bragg boundaries.
  • Simulations successfully reproduced electron beam dynamics and radiation characteristics.

Conclusions:

  • The planar dielectric wakefield structure with Bragg reflectors effectively excites a narrow-band, single fundamental mode.
  • Experimental and simulation results validate the design for controlled wakefield generation.
  • This work advances the development of precise particle acceleration technologies.