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Local density fluctuations were measured in plasmas with strong neutral beam heating by means of a homodyne 2 mm microwave scattering diagnostic. Co-injection of neutral beams into an ohmic plasma is shown to induce a specific fluctuation phenomenon in the central plasma region, which correlates strongly with the evolution of the sawtooth. Possible explanations could involve a direct beam-plasma instability, a plasma profile instability or a direct effect of fast particles.

Additional information

Authors: JADOUL M, Ecole Royale Militaire, Bruxelles (BE);WALDMANN G, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE)
Bibliographic Reference: Paper presented: 17th European Conference on Controlled Fusion and Plasma Heating, Amsterdam (NL), June 25-29, 1990
Availability: Available from (1) as Paper EN 35807 ORA
Record Number: 199011636 / Last updated on: 1994-12-02
Original language: en
Available languages: en