Abstract
Five distinct discharge modes are observed in a cylindrically-symmetric helicon reactor. Each mode is characterized by its plasma impedance, wave mode structure, density distribution and floating potential structure. It is shown that the lowest two modes are capacitive (E) and inductive (H), while higher modes are helicon wave (W) modes. Successive wave modes are found to correspond to helicon wave cavity resonances of the plasma-filled vacuum vessel, each with a well defined wavevector, density and impedance. Measured wavevectors and densities are in agreement with the helicon wave dispersion relation. The first helicon discharge mode is found to be an m = ±1 mode, as expected for a double saddle field antenna. Unexpectedly, the second and third helicon modes have an m = 0 azimuthal symmetry.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
