Constructing plasma response models from full toroidal magnetohydrodynamic computations |
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Authors: | Yueqiang Liu |
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Affiliation: | Department of Applied Mechanics, EURATOM-VR/Fusion Association, Chalmers University of Technology, S-412 96 Göteborg, Sweden |
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Abstract: | We explore accurate and efficient algorithms for constructing plasma response models, based on the computed data using a full toroidal MHD stability code MARS-F. These response models are used to study feedback stabilization of resistive wall modes for fusion plasmas. Three approaches are discussed and compared. A direct full-model computation offers the most accurate response, unfortunately without producing analytical expressions for the response model. The pole-residue expansion methods yield analytical and asymptotically rigorous response models. A low-order Padé approximation serves as a model reduction technique that simplifies the controller design, while keeping a reasonable accuracy for the response models. From the computational viewpoint, the most efficient approaches are the pole-residue expansion based on eigenfunction projection, and the low-order Padé approximation. |
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Keywords: | 52.35.Py 28.52.Av 52.55.Fa 52.65.Kj |
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