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Direct antenna excitation of the shear Alfvén wave at finite frequency in the boundary of a fusion plasma

Published online by Cambridge University Press:  01 January 1998

G. G. BORG
G. G. BORG
Affiliation:
Wills Plasma Physics Department, School of Physics, The University of Sydney, Sydney, 2006 NSW, Australia Present address: Plasma Research Laboratory, Research School of Physical Sciences and Engineering, Australian National University, Canberra, 0200 ACT, Australia.
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Abstract

The problem of direct excitation of the shear Alfvén wave by antennas in the boundary of a fusion plasma is considered. In the plasma scrape-off layer the physics of this wave is determined by finite electron inertia. Expressions for the wave electric and magnetic field are derived without any assumption on the smallness of the ratio of frequency to ion cyclotron frequency. It is shown that the shear Alfvén wave propagates as a guided beam along the steady magnetic field over a wide range of frequencies below the ion cyclotron frequency, and is predominantly excited by current elements parallel to the steady magnetic field. A simple transmission-line analogy suggests that guidance of the Alfvén wave is also expected in the presence of strong plasma inhomogeneity.

Type
Research Article
Information
Journal of Plasma Physics , Volume 59 , Issue 1 , January 1998 , pp. 151 - 168
Copyright
1998 Cambridge University Press

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