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Coupling of slow waves near the lower hybrid frequency is well understood and linear theory with density step followed by a constant gradient can be used with some confidence. With the aid of the computer code SWAN, or `Slow Wave ANtenna', the following parameters can be calculated numerically: 1) n(parallel) power spectrum 2) directivity (weighted by the current drive efficiency), 3) reflection coefficients (amplitude and phase) both before and after the E-plane junctions, 4) scattering matrix at the plasma interface, 5) scattering matrix at the E-plane junctions, 6) maximum electric field in secondary waveguides and the location where it occurs, 7) effect of passive waveguides on each side of the antenna, 8) effect of a finite magnetic field in front of the antenna (homogeneous model). The purpose of this `manual' is to give basic information on the main assumptions of the coupling theory and on the use and general structure of the code itself.

Additional information

Authors: LITAUDON X, JET Joint Undertaking, Abingdon, Oxon (GB);MOREAU D, CEA, CEN Cadarache (FR)
Bibliographic Reference: Report: JET-R(89)01 EN (1989)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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