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Large-orbit gyrotron operation in the terahertz frequency range.

V L Bratman1, Yu K Kalynov, V N Manuilov

  • 1Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, 603950, Russia. bratman@appl.sci-nnov.ru

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Researchers achieved coherent terahertz high-harmonic radiation using a gyrotron and an axis-encircling electron beam. This breakthrough in terahertz generation opens new possibilities for advanced applications.

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Area of Science:

  • Physics
  • Quantum Optics
  • Plasma Physics

Background:

  • High-harmonic generation (HHG) is a crucial process for producing coherent radiation in the extreme ultraviolet and X-ray regions.
  • Generating coherent terahertz (THz) radiation via HHG is challenging due to the lower photon energies and different plasma dynamics involved.
  • Gyrotrons are vacuum electronic devices capable of generating high-power millimeter and sub-millimeter waves, but their application to HHG is less explored.

Purpose of the Study:

  • To investigate the feasibility of generating coherent terahertz high-harmonic radiation (THz-HHG) in a gyrotron.
  • To develop and optimize an electron-optical system for producing a suitable electron beam for THz-HHG.
  • To characterize the generated THz-HHG in terms of frequency, power, and stability.

Main Methods:

  • Utilized a gyrotron equipped with a specialized electron-optical system featuring a cusp gun and adiabatic magnetic compression.
  • Formed an 80-keV/0.7-A electron beam of gyrating electrons by adjusting voltages and magnetic fields.
  • Detected and analyzed the generated radiation using appropriate diagnostic tools to determine frequency, power, and pulse characteristics.

Main Results:

  • Successfully obtained coherent terahertz high-harmonic radiation.
  • Achieved stable single-mode generation with output power ranging from 0.3-1.8 kW in microsecond pulses.
  • Observed generation at four distinct frequencies within the 0.55-1.00 THz range.
  • Generation occurred at resonant magnetic fields between 10.5-14 T.

Conclusions:

  • Demonstrated the successful generation of coherent THz-HHG in a gyrotron.
  • The developed electron-optical system effectively produced the required electron beam parameters for THz-HHG.
  • The results indicate the potential of gyrotrons as a viable platform for high-power, coherent THz radiation sources.