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Current issue   Ukr. J. Phys. 2016, Vol. 61, N 11, p.956-959
http://dx.doi.org/10.15407/ujpe61.11.0956    Paper

Virko V.F., Slobodyan V.M., Virko Yu.V.

Institute for Nuclear Research, Nat. Acad. of Sci. of Ukraine
(47, Prosp. Nauky, Kyiv 03680, Ukraine; e-mail: y.v.virko@gmail.com)

Coupling of Helicon Antennas to Plasma near the Electron Cyclotron Resonance

Section: Plasmas and Gases
Original Author's Text: English

Abstract: Two inductive antennas, which are usually used for the excitation of a helicon discharge on the wave azimuthal mode m = 1 and m = 0, demonstrate unexpectedly different properties near the electron-cyclotron frequency ωce. Though the alternating inductive electric field E produced by the antenna m = 1 is mainly parallel to the external steady magnetic field B0, nevertheless the absorption resonance at the frequency ωce accompanied by an increase in the plasma density, takes place. For the m = 0 antenna, where these fields are mutually transverse and where the cyclotron resonance seems certainly must be present, it is absent. But the electron-cyclotron resonance (ECR) appears again provided the B0 field is turned up by the right angle around the same m = 0 antenna.

Key words:  helicon discharge, electron-cyclotron resonance, inductive antenna.