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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Electromagnetic wave propagation

Background:

  • Tokamak discharges generate electromagnetic waves through coupling with plasma waves.
  • Runaway electrons in tokamaks emit signals carrying information about kinetic instabilities.
  • Radio frequency (RF) emissions offer a unique diagnostic for studying fast particle behavior.

Purpose of the Study:

  • To investigate RF emissions from runaway electron scenarios in tokamak plasmas.
  • To analyze the frequency scaling of kinetic instabilities in the lower hybrid range.
  • To estimate the radial location of runaway electron beam and plasma wave interactions.

Main Methods:

  • Experiments conducted at the Frascati Tokamak Upgrade (FTU).
  • Exploration of frequencies in the lower hybrid and whistler wave ranges.
  • Simplified analysis of frequency scaling with respect to density profiles and wave vector coupling.

Main Results:

  • Observed pronounced sensitivity of RF measurements in detecting driven instabilities.
  • Demonstrated the potential of RF emissions as a monitor for instability processes.
  • Provided a method for estimating the radial location of wave-particle interactions.

Conclusions:

  • RF emission analysis is a valuable tool for studying fast electron activity in tokamaks.
  • Understanding these emissions aids in monitoring plasma instabilities during discharge.
  • The study offers insights into the interaction dynamics between runaway electrons and plasma waves.