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The non-resonant decay of the fast magnetosonic wave into an Ion Bernstein wave and a quasi-mode is investigated from the point of view of assessing the importance of this process for the observed direct heating of the edge plasma during ion-cyclotron resonance heating. Starting from the Maxwell-Vlasov equations, expressions for the threshold electric field and the growth rates of the decay process are obtained. For typical situations the threshold is determined by the convective damping of the Bernstein wave. For JET like parameters, the thresholds for the decay are easily exceeded and the growth time for typical fast wave electric field strengths is of the order of a microsecond. The parametric dependence of the threshold on magnetic field, temperature, the density of the various ion species, and electron-ion collisions is studied. Finally the relevance of this process to the heating of plasma edge during ICRH is discussed.

Additional information

Authors: AVINASH K, Institute for Plasma Research, Bhat., Gandhinagar (India);CORE W G, JET Joint Undertaking, Abingdon, Oxon. (GB);HELLSTEN T, JET Joint Undertaking, Abingdon, Oxon. (GB);FARRELL C M, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: EN (1988)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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