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Related Experiment Videos

Torque on an ideal plasma.

J B Taylor1

  • 1EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom.

Physical Review Letters
|October 4, 2003
PubMed
Summary
This summary is machine-generated.

Nonlinear terms in plasma physics can cause a torque on rotating plasma, even in ideal conditions. This study evaluates the torque generated by singularities in a confined plasma field.

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Area of Science:

  • Plasma Physics
  • Fluid Dynamics
  • Astrophysics

Background:

  • Rotating plasmas are confined by magnetic fields.
  • Ideal plasma theory predicts zero torque due to time reversal symmetry.
  • Singularities in plasma configurations can violate ideal conditions.

Purpose of the Study:

  • To evaluate the torque exerted on a rotating plasma by field ripples.
  • To investigate the contribution of nonlinear terms to plasma torque.
  • To analyze the conditions under which a nonzero torque arises in a plasma.

Main Methods:

  • Theoretical evaluation of torque in a simple plasma configuration.
  • Analysis of nonlinear terms in the plasma equations of motion.
  • Investigation of singularities within the confining field.

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Main Results:

  • Field ripples can induce a nonzero torque on rotating plasma.
  • Singularities are essential for generating this torque, contrary to ideal plasma predictions.
  • The net force is localized to a singular layer and directed along the ripple wave vector.

Conclusions:

  • Nonlinear effects and plasma singularities are crucial for understanding plasma dynamics.
  • The evaluated torque is linked to energy absorption within the singular layer.
  • This finding has implications for plasma confinement and stability in various applications.