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Progress in Modeling Non-Axisymmetric Response in Tokamaks

Author: Nathaniel M. Ferraro
Requested Type: Poster Only
Submitted: 2015-01-19 15:28:27

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Contact Info:
General Atomics
P.O. Box
San Diego, California   92186-5
USA

Abstract Text:
Predictive models of the salient effects of the application of non-axisymmetric fields in tokamaks, including ELM suppression and enhanced particle transport (“pump-out”), require validated models both of 3D magnetic equilibria, and of transport in these 3D magnetic geometries. Recent efforts to validate equilibrium and transport calculations against measurements from dedicated experiments on tokamaks including DIII-D, NTSX, C-Mod, and ASDEX-U have led to significant progress in understanding the plasma response to non-axisymmetric fields and the physics of ELM suppression. Linear, ideal-MHD is found to describe the plasma response well at low β. Non-ideal, and non-linear effects are confirmed to play an important role at higher β or lower rotation. The response in these non-ideal regimes is found to be less well quantitatively described by existing models. Development and validation of the M3D-C1 code, which implements a non-ideal MHD model, are discussed in detail. In particular, we describe a new resistive wall model in the M3D-C1 code allows both quantitative comparison of simulation results with magnetics data. Both completed and ongoing efforts to couple the M3D-C1 code to a wide range of codes for integrated modeling of transport in 3D fields, the ultimate aim of which is obtaining predictive models of ELM suppression and particle transport, are also discussed.

* Supported by the US DOE under DE-FC02-04ER54698 & DE-FG02-95ER54309.

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