Generalized theory of helicon waves. II. Excitation and absorption
- 1 May 1998
- journal article
- Published by AIP Publishing in Physics of Plasmas
- Vol. 5 (5), 1239-1254
- https://doi.org/10.1063/1.872782
Abstract
Helicon waves in a plasma confined by a cylinder are treated. The undamped normal modes of the helicon (H) and Trivelpiece–Gould (TG) waves have distinctly different wave patterns at high magnetic fields but at low fields have similar patterns and therefore interact strongly. Damping of these modes, their excitation by antennas, and the rf plasma absorption efficiency are considered. Nonuniform plasmas are treated by solving a fourth-order ordinary differential equation numerically. A significant difference between this and earlier codes which divide the plasma into uniform shells is made clear. Excitation of the weakly damped H wave, followed by conversion to the strongly damped TG wave which leads to high helicon discharge efficiency, is examined for realistic density profiles. A reason for the greater heating efficiency of the m=+1 vs the m=−1 mode for axially peaked profiles is provided.Keywords
This publication has 10 references indexed in Scilit:
- Two-dimensional imaging of a helicon dischargePlasma Sources Science and Technology, 1997
- Generalized theory of helicon waves. I. Normal modesPhysics of Plasmas, 1997
- Excitation, conversion and damping of waves in a helicon plasma source driven by anm= 0 antennaPlasma Physics and Controlled Fusion, 1997
- An evaluation of different antenna designs for helicon wave excitation in a cylindrical plasma sourcePhysics of Plasmas, 1996
- Dynamic Formation of Excited Helicon Wave Structure and Estimation of Wave Energy Flux DistributionJapanese Journal of Applied Physics, 1996
- Modeling of profile effects for inductive helicon plasma sourcesIEEE Transactions on Plasma Science, 1996
- Helicon waves in a non-uniform plasmaPlasma Sources Science and Technology, 1994
- Experimental modeling of inductive dischargesJournal of Vacuum Science & Technology A, 1993
- Plasma ionization by helicon wavesPlasma Physics and Controlled Fusion, 1991
- Very efficient plasma generation by whistler waves near the lower hybrid frequencyPlasma Physics and Controlled Fusion, 1984