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ASDEX Upgrade Gyrokinetic Treatment of Transonic ExB Flows

By B. Scott and Max Planck


• traditional gyrokinetics is nonlinear/global nevertheless assumes small fluctuations • with arbitrary scale but small fluctuations, the ExB flow is implicitly assumed to be subsonic • despite the energetic consistency, the traditional model still breaks down formally for transonic flow (in this context transonic means flow energy comparable to temperature) Outline of Gyrokinetics for Strong Flows • re-examine the fundamentals of the theory — dispense with the intermediate guiding center transform — all ordering decisions and expansions are done with Lie transforms — how coordinate transforms are decided (determines guiding center picture) • add the electrostatic potential and an arbitrary flow — the flow can be anything but the lowest Euler-Lagrange flow is the ExB one — choices of generating functions: where to put the flow terms — polarisation drift versus polarisation density (can have but don’t want both) — ultimately follow the traditional procedure, choose the g’s so tha

Year: 2011
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