Helicon wave excitation with helical antennas

Статья опубликована в журнале: Phys. Plasmas, Vol. 2, No. 4, April 1995Геликоные волны возбужденные геликоной антеннойComponentsof the wave magnetic field in a helicon dischargehave been measuredwith a single-turn, coaxial magnetic probe, Left- and right-handed helical antennas, as well as plane-polarizedantennasw, ereused;andtheresultswerecomparedwith thefieldpatternscomputed for a nonuniform plasma. The results show that the right-hand circularly polarized mode is preferentially excited with all antennas,even those designedto excite the left-hand mode. For right-hand excitation, the radial amplitude profiles are in excellent agreement with computations.0 1995 American Institure of Physics.