Abstract
The expansion of plasma in the early stage of an inductive high frequency discharge in helium has been investigated experimentally. In a collision dominated case a non-stationary ambipolar diffusion current transfers a lightly ionized plasma from a source region into an initially neutral ambient gas. Time resolved measurements of electron density and electron temperature have been performed at the source and at a test point outside of the plasma source region by 4 mm-microwave interferometer and pulsed double probe techniques. A comparison of experimental data with calculations based on a simplified diffusion model for collision dominated plasma expansion is given.
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Herrn Dr. F.Waelbroeck möchte ich für wertvolle Diskussionen, Herrn Dipl. Phys. W.Hopmann für den Bau eines Sägezahngenerators, der eine schnelle Doppelsondenmessung ermöglichte, und Herrn W.Pysik für seine Hilfe bei der experimentellen Arbeit danken.
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Waidmann, G. Plasmaausbreitung in einer induktiven Hochfrequenzentladung. Z. Physik 218, 298–307 (1969). https://doi.org/10.1007/BF01458411
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DOI: https://doi.org/10.1007/BF01458411