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Optical Bragg accelerators.

Amit Mizrahi1, Levi Schächter

  • 1Department of Electrical Engineering, Technion-IIT, Haifa 32000, Israel.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 25, 2004
PubMed
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Bragg waveguides using dielectric layers offer excellent optical acceleration structures. These structures confine accelerating fields and can achieve high gradients, with lower emitted power compared to metallic structures.

Area of Science:

  • Physics
  • Engineering
  • Materials Science

Background:

  • Optical acceleration structures are crucial for high-energy physics.
  • Dielectric structures offer potential advantages over traditional metallic designs.
  • Bragg waveguides provide a novel approach to confining accelerating fields.

Purpose of the Study:

  • To investigate the potential of Bragg waveguides as optical acceleration structures.
  • To analyze field confinement and achievable gradients in dielectric Bragg waveguides.
  • To study wake field effects and emitted power in these structures.

Main Methods:

  • Theoretical analysis of electromagnetic field confinement in planar and cylindrical Bragg waveguides.
  • Material property analysis, including silica and zirconia, and hypothetical high-permittivity materials.

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  • Calculation of interaction impedance, energy velocity, and wake field power.

    • Main Results:

    • Bragg waveguides can achieve accelerating gradients of approximately 1 GV/m with interaction impedances of hundreds of ohms.
    • Adjusting dielectric layer width allows for effective confinement of accelerating fields.
    • Emitted wake field power is significantly lower in dielectric Bragg waveguides compared to metallic structures, especially with a higher number of layers.

    Conclusions:

    • Bragg waveguides represent a promising platform for advanced optical acceleration.
    • The design allows for tunable field confinement and high accelerating gradients.
    • Reduced emitted power suggests improved efficiency and beam quality for particle acceleration.