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Direct electron damping of low frequency fast magnetosonic waves has been observed in the centre of high beta hydrogenic JET plasmas where transit time magnetic pumping is a significant component in the electron-wave interaction mechanism. The electron heating power profile is peaked on axis, extends across almost half the minor radius and accounts for 22+/-5% of the total radiofrequency power coupled to the plasma. Outside this region, the fast wave is absorbed by hydrogen ions at the second harmonic cyclotron resonance which is situated 0.4m inboard of the magnetic axis.

Additional information

Authors: START D F H, JET Joint Undertaking, Abingdon, Oxon. (GB);BARTLETT D V, JET Joint Undertaking, Abingdon, Oxon. (GB);BHATNAGAR V P ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB);HELLSTEN T, Royal Institute of Technology, Stockholm (SE);MAYBERRY M J, General Atomics, San Diego (US);MOREAU D, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Report: JET-P(90)02 EN (1990) 14 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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