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Rotating ion beam effects on temperature gradient instability in completely ionized plasmas.

S M Khorashadizadeh1, S Abbasi1, A R Niknam2

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This study explores how rotating ion beams affect plasma temperature gradient instability (TGI). Results show TGI can be damped or altered by these beams, depending on their velocity and density.

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Area of Science:

  • Plasma Physics
  • Magnetohydrodynamics
  • Astrophysical Plasmas

Background:

  • Temperature Gradient Instability (TGI) arises in inhomogeneous plasmas due to temperature and density gradients.
  • Such instabilities are crucial in understanding plasma behavior in various astrophysical and laboratory settings.
  • The presence of rotating ion beams can significantly influence plasma dynamics.

Purpose of the Study:

  • To investigate the impact of a rotating ion beam on the temperature gradient instability (TGI) in fully ionized plasmas.
  • To analyze how plasma parameters and ion beam characteristics modify TGI growth rates.
  • To determine the conditions under which TGI can be stabilized or destabilized by rotating ion beams.

Main Methods:

  • Utilized kinetic theory and geometrical optics approximation to derive the dielectric permittivity tensor.
  • Employed a linear eikonal equation to calculate the growth rate of TGI.
  • Analyzed the influence of density and temperature gradients perpendicular to a magnetic field in the presence of a rotating ion beam (e.g., O+).

Main Results:

  • Identified unstable conditions in regions with opposing electron density and temperature gradients.
  • Found that TGI is destabilized by gradients and frequent electron collisions.
  • Demonstrated that rotating ion beams can effectively damp or modify TGI.

Conclusions:

  • The interaction between rotating ion beams and plasma significantly impacts TGI.
  • The velocity and density of the rotating ion beam are critical factors in determining the damping or modification of TGI.
  • This research provides insights into controlling plasma instabilities through controlled ion beam injection.