Diffusion Wave Technique Applied to a Magnetized Helium Positive Column Plasma.
COLORADO UNIV BOULDER DEPT OF AEROSPACE ENGINEERING SCIENCES
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A new technique is developed for exciting a one-dimensional diffusion wave transverse to the magnetic field in an active helium positive column plasma. A modulated electron beam is used to produce a sinusoidal plasma density perturbation along the axis of a quiet magnetized helium positive column plasma. The perturbation in plasma density dissipates radially from the axis as a diffusion wave. Radial profiles of amplitude and phase of the perturbation are measured with a movable Langmuir probe input to a phase-lock amplifier. The transverse diffusion coefficient is obtained by fitting a diffusion model to the amplitude and phase profiles. Modified author abstract
- Plasma Physics and Magnetohydrodynamics