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Related Experiment Videos

Dipole-mode wakefields in dielectric-loaded rectangular waveguide accelerating structures.

Chunguang Jing1, Wanming Liu, Liling Xiao

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

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 26, 2003
PubMed
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Transverse wakefields in dielectric structures can be decomposed into longitudinal section electric (LSE) and magnetic (LSM) modes. This decomposition aids in understanding wakefield characteristics for accelerator design.

Area of Science:

  • Particle Accelerator Physics
  • Electromagnetism
  • Waveguide Theory

Background:

  • Understanding wakefields is crucial for designing high-gradient particle accelerators.
  • Previous work focused on longitudinal wakefields; transverse wakefields require further analysis.
  • Dielectric structures offer potential for advanced accelerator designs.

Purpose of the Study:

  • To decompose transverse wakefields in partially loaded rectangular dielectric structures.
  • To characterize these wakefields using normalized shunt impedance (R/Q) for LSE and LSM modes.
  • To validate analytical results with numerical simulations.

Main Methods:

  • Applying symmetric boundary conditions to analyze wakefield generation.
  • Decomposing transverse wakefields into longitudinal section electric (LSE) and longitudinal section magnetic (LSM) modes.

Related Experiment Videos

  • Utilizing the normalized shunt impedance (R/Q) for wakefield characterization.
  • Performing time domain simulations using MAFIA for validation.

    • Main Results:

    • Transverse wakefields can be decomposed into orthogonal LSE and LSM modes.
    • Normalized shunt impedance (R/Q) is determined as a function of structure geometry.
    • Detailed analysis of leading transverse wakefield terms for an X-band waveguide.
    • Analytical results show strong agreement with MAFIA simulations.

    Conclusions:

    • The decomposition method provides a robust framework for analyzing transverse wakefields.
    • Characterization via R/Q is effective for both LSE and LSM modes.
    • The findings are applicable to the design of future dielectric accelerating structures.