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Field analysis of a dielectric-loaded rectangular waveguide accelerating structure.

Liling Xiao1, Wei Gai, Xiang Sun

  • 1High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 22, 2002
PubMed
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Researchers explored dielectric-loaded rectangular waveguides for linear accelerators. Rotating structures by 90 degrees creates a nearly uniform accelerating force, improving high-gradient accelerator design.

Area of Science:

  • Physics
  • Accelerator Science
  • Electromagnetism

Background:

  • Dielectric-loaded structures offer potential for high-gradient linear accelerators.
  • Rectangular waveguides are being investigated for their accelerating properties.

Purpose of the Study:

  • To analyze the modes of dielectric-loaded rectangular waveguide accelerating structures.
  • To investigate methods for achieving a uniform accelerating field.
  • To calculate key performance parameters and wakefields.

Main Methods:

  • Circuit model approximation and mode matching were employed for analysis.
  • A novel approach using successively rotated structures was proposed.
  • MAFIA code suite was used for numerical validation.

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Main Results:

  • The acceleration field is generally nonuniform in transverse dimensions.
  • Successive 90-degree rotations of rectangular structures yield an almost uniform net accelerating force.
  • Characteristic parameters (R/Q, group velocity, attenuation) and longitudinal wakefields were calculated for X- and W-band accelerators.

Conclusions:

  • The proposed method effectively achieves a uniform accelerating force in dielectric-loaded rectangular waveguides.
  • Analytical results are validated by numerical simulations, confirming the approach's accuracy.
  • This work contributes to the development of advanced high-gradient linear accelerators.