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Radially localized helicon modes in nonuniform plasma

Breizman¹, Arefiev

¹Institute for Fusion Studies, The University of Texas, Austin, Texas 78712, USA.

Physical Review Letters

|October 6, 2000

Summary

A radial density gradient in plasma columns creates a potential well for helicon modes. This analytic study reveals efficient radio-frequency power absorption in helicon discharges at low frequencies.

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Area of Science:

Plasma Physics
Wave Phenomena

Background:

Axisymmetric cylindrical plasma columns exhibit radial density gradients.
These gradients can form potential wells influencing plasma wave behavior.

Purpose of the Study:

To provide an analytic description of nonaxisymmetric helicon modes (m ≠ 0) in plasma columns.
To investigate the impact of radial density gradients on helicon mode behavior.

Main Methods:

Developed an analytic model for nonaxisymmetric helicon modes.
Analyzed mode behavior in the limit of small longitudinal wave numbers.

Main Results:

The radial density gradient creates a potential well for nonaxisymmetric helicon modes.
The derived mode equation suggests efficient resonant absorption of radio-frequency (RF) power.
This absorption can occur at unusually low frequencies in helicon discharges.

Conclusions:

Analytic solutions confirm the role of density gradients in helicon mode confinement.
The findings indicate potential for enhanced RF power coupling in helicon plasma sources.
Low-frequency resonant absorption offers new possibilities for plasma discharge control.

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