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The problem of wave induced stochasticity in plasmas is being studied extensively because of its general interest in chaotic dynamics and of its possible direct consequences in space and laboratory plasmas, such as anomalous transport, non-linear heating and particle acceleration. It has been shown theoretically and experimentally that in a magnetised plasma a wave propagating at a finite angle with respect to the B-field can generate chaos in particle orbits and, consequently, fast ion heating. The case of two waves propagating at different phase velocities is predicted to be more efficient for the heating. This article describes an experiment performed to investigate the interaction between ions and two propagating electrostatic modes in a Q-machine plasma. In particular, the purpose of the experiment was to perform and integrate observations of the collective ion response (wave characteristics) of ion kinetic features (modification of the distribution functions, timetable for heating) and of single particle orbit modifications (phase space transport).

Additional information

Authors: FASOLI A ET AL., Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: Proceedings of the 1992 International Conference on Plasma Physics Part III, Vol. 16C (1992) pp. 1863-1866
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