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Nonlinear and self-consistent single-mode formulation for TM-mode gyrotrons.

Hsin-Yu Yao1, Cheng-Hsiung Wei1, Tsun-Hsu Chang1

  • 1Department of Physics, National Tsing Hua University, Hsinchu, 30013, Taiwan.

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|January 15, 2022
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Summary
This summary is machine-generated.

This study presents a new simulation framework for TM-mode gyrotrons, achieving over 30% efficiency. The research explores tuning properties and potential for compact, low-cost gyrotron backward-wave oscillator (gyro-BWO) systems.

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Area of Science:

  • Plasma Physics
  • Electromagnetic Wave Theory
  • Microwave Engineering

Background:

  • Gyrotrons are crucial for high-power microwave generation.
  • Transverse Magnetic (TM) modes in gyrotrons offer unique advantages but are less explored than Transverse Electric (TE) modes.
  • Existing simulation frameworks often lack the non-linear, self-consistent approach needed for TM-mode analysis.

Purpose of the Study:

  • To develop a nonlinear, self-consistent simulation framework for TM-mode gyrotrons.
  • To investigate the performance characteristics and tuning properties of TM-mode gyrotrons.
  • To explore the potential of TM-mode gyrotron backward-wave oscillators (gyro-BWOs).

Main Methods:

  • Derivation of a nonlinear TM wave equation accounting for axial electric field modulation.
  • Particle tracing simulations incorporating electron motion equations.
  • Analysis of electron-beam efficiency, tuning properties (beam current, voltage, pitch factor), and magnetic field effects.

Main Results:

  • Achieved over 30% electron-beam efficiency for the TM_{11}-mode gyrotron in the W band for uniform structures.
  • Demonstrated a frequency tuning range exceeding 6 GHz for a gyro-BWO with a pitch factor of 1.5.
  • Identified operating conditions with high peak efficiency (32%) at low beam voltage (10 kV) and low magnetic field (32.8 kG).

Conclusions:

  • The developed framework enables accurate simulation of TM-mode gyrotron oscillations.
  • TM-mode gyrotrons exhibit significant efficiency and broad tuning capabilities.
  • These findings support the development of cost-effective and compact gyrotron systems, particularly TM-mode gyro-BWOs.