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Diffusion cooling in a magnetic field

¹Department of Theoretical Physics, Australian National University, Canberra, Australia.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

|October 25, 2000

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Electron diffusion cooling in magnetized plasmas can create hollow temperature profiles and inward electric fields. This phenomenon, observed in weakly ionized plasmas, mirrors conditions in hotter toroidal devices.

Area of Science:

Plasma Physics
Magnetohydrodynamics
Electron Transport

Background:

Electron cooling is crucial for plasma stability and confinement.
Magnetic fields significantly influence charged particle behavior in plasmas.
Understanding electron temperature profiles is key to plasma diagnostics.

Purpose of the Study:

To investigate electron diffusion cooling in weakly ionized plasmas under magnetic fields.
To analyze the formation of hollow electron temperature profiles.
To examine the behavior of the radial ambipolar electric field.

Main Methods:

Utilizing momentum transfer theory and balance equations.
Applying "swarm" or test particle analysis techniques.
Modeling a cylindrical, axially symmetric plasma system.

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Main Results:

Demonstrated the possibility of hollow electron temperature profiles (T(e)
Showed that the radial ambipolar electric field can reverse direction (point inwards).
Identified specific conditions leading to these plasma behaviors.

Conclusions:

Electron diffusion cooling can lead to non-intuitive temperature distributions.
Observed phenomena in weakly ionized plasmas resemble those in high-temperature toroidal devices.
The study provides insights into plasma behavior relevant to fusion research.