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<p>We propose to use a combined two-mirror resonator based on the three-dimensional (3D) and onedimensional (1D) Bragg reflectors in order to achieve a multi-gigawatt level of microwave power in free-electron masers (FEMs) having the planar geometry. The possibility of creating a FEM of this type in the W band on the basis of the U-2 accelerator, which forms a sheet electron beam with a cross section of 1×140 cm, is studied within the framework of the quasioptical model. It is shown that in the proposed scheme, the input Bragg 3D reflector implementing the mechanism of the three-dimensional distributed feedback allows one to ensure the synchronization of radiation along both transverse coordinates at the cross-sectional sizes of the system from tens to hundreds of wavelengths, while a small reflection from the output conventional 1D Bragg reflector is sufficient to complete the feedback loop and provide the single-mode generation regime with a high efficiency and a low ohmic-loss level. At the optimal parameters, the possibility is demonstrated of obtaining a stable narrow-band generation regime in the developed FEM with an electron efficiency of about 18–20% and a record-breaking output radiation power of up to 20 GW.</p>

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Using a Combined Resonator Based on Three-Dimensional and One-Dimensional Bragg Mirrors to Produce High-Power Coherent Radiation in a Planar Free-Electron Maser

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • N. Yu. Peskov,
  • E. D. Egorova,
  • N. S. Ginzburg,
  • A. S. Sergeev,
  • A. V. Arzhannikov,
  • S. L. Sinitsky

摘要

We propose to use a combined two-mirror resonator based on the three-dimensional (3D) and onedimensional (1D) Bragg reflectors in order to achieve a multi-gigawatt level of microwave power in free-electron masers (FEMs) having the planar geometry. The possibility of creating a FEM of this type in the W band on the basis of the U-2 accelerator, which forms a sheet electron beam with a cross section of 1×140 cm, is studied within the framework of the quasioptical model. It is shown that in the proposed scheme, the input Bragg 3D reflector implementing the mechanism of the three-dimensional distributed feedback allows one to ensure the synchronization of radiation along both transverse coordinates at the cross-sectional sizes of the system from tens to hundreds of wavelengths, while a small reflection from the output conventional 1D Bragg reflector is sufficient to complete the feedback loop and provide the single-mode generation regime with a high efficiency and a low ohmic-loss level. At the optimal parameters, the possibility is demonstrated of obtaining a stable narrow-band generation regime in the developed FEM with an electron efficiency of about 18–20% and a record-breaking output radiation power of up to 20 GW.