0372-400Х (Edition in Ukrainian)
2071-0186 (Edition in English)
2071-0194 (in electronic form)
Abbreviated key title: Ukr. J. Phys.
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: firstname.lastname@example.org)
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.