NDLI: Stabilization of Neoclassical Tearing Modes in tokamak fusion plasmas via extremum seeking

Content Provider	IEEE Xplore Digital Library
Author	Wehner, W. Schuster, E.
Copyright Year	2009
Description	Author affiliation: Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, PA 18015, USA (Wehner, W.; Schuster, E.)
Abstract	The neoclassical tearing mode (NTM) instability produces magnetic islands in tokamak plasmas that can degrade confinement and lead to plasma disruptions. NTMs are driven by a lack of bootstrap current inside the magnetic island where the pressure profile is flattened. Suppression of these islands is necessary for sustained energy confinement and efficient operation in tokamak magnetic-fusion reactors. Compensating for the lack of bootstrap current by an Electron Cyclotron Current Drive (ECCD) has been proved experimentally as an effective method to stabilize NTMs. The effectiveness of this method is limited in practice by the uncertainties in the width of the island, the relative position between the island and the EC beam, and the EC power threshold for NTM stabilization. Heuristic search and suppress algorithms have been proposed and shown effective to improve the alignment of the EC beam with the island by just using an estimate of the island width. Making use of this estimate, a real-time, non-model-based, extremum-seeking optimization algorithm is proposed in this work for EC beam steering and modulation in order to minimize the island-beam misalignment and the time (control energy) required for NTM stabilization. The efficiency of the proposed method is compared with traditional search and suppress algorithms.
Starting Page	853
Ending Page	860
File Size	1046265
Page Count	8
File Format	PDF
ISBN	9781424446018
ISSN	10851992
DOI	10.1109/CCA.2009.5280943
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-07-08
Publisher Place	Russia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Tokamaks Plasma confinement Magnetic confinement Degradation Inductors Electrons Cyclotrons Uncertainty Beam steering Optical modulation
Content Type	Text
Resource Type	Article

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