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Transport of energetic ions due to sawteeth, Alfvén eigenmodes and microturbulence

D.C. Pace1, R.K. Fisher2, M. García-Muñoz3, W.W. Heidbrink1, G.R. McKee4, M. Murakami5, C.M. Muscatello1, R. Nazikian6, J.M. Park5, C.C. Petty2, T.L. Rhodes7, G.M. Staebler2, M.A. Van Zeeland2, R.E. Waltz2, R.B. White6, J.H. Yu8, W. Zhang1 and Y.B. Zhu1

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Utilizing an array of new diagnostics and simulation/modelling techniques, recent DIII-D experiments have elucidated a variety of energetic ion transport behaviour in the presence of instabilities ranging from large-scale sawteeth to fine spatial scale microturbulence. Important new insights include sawteeth, such as those of the ITER baseline scenario, causing major redistribution of the energetic ion population; high levels of transport induced by low-amplitude Alfvén eigenmodes can be caused by the integrated effect of a large number of simultaneous modes; and microturbulence can contribute to the removal of alpha ash while having little effect on fusion alphas. This paper provides an overview of recent and upcoming results from the DIII-D Energetic Particles research programme.


PACS

52.35.Bj Magnetohydrodynamic waves (e.g., Alfven waves)

52.35.Py Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)

52.35.Ra Plasma turbulence

52.55.Fa Tokamaks, spherical tokamaks

Subjects

Plasma physics

Dates

Issue 4 (April 2011)

Received 21 December 2010, accepted for publication 3 March 2011

Published 1 April 2011



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