Modeling and control of plasma rotation for NSTX using neoclassical toroidal viscosity and neutral beam injection

A model-based feedback system is presented to control plasma rotation in a magnetically confined toroidal fusion device, to maintain plasma stability for long-pulse operation. This research uses experimental measurements from the National Spherical Torus Experiment (NSTX) and is aimed at controlling...

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Bibliographic Details
Published in:Nuclear fusion 2016-02, Vol.56 (3), p.36023-36036
Main Authors: Goumiri, I.R., Rowley, C.W., Sabbagh, S.A., Gates, D.A., Gerhardt, S.P., Boyer, M.D., Andre, R., Kolemen, E., Taira, K.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Control systems
Controllers
Feedback control
fusion-reactors
injection
magnetic confinement
Mathematical models
neoclassical toroidal viscosity
neutral beam
neutral beam injection
Neutral beams
NSTX
Nuclear fusion
rotation Control
Three dimensional
tokamak
transport
turbulence
Viscosity
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Summary:A model-based feedback system is presented to control plasma rotation in a magnetically confined toroidal fusion device, to maintain plasma stability for long-pulse operation. This research uses experimental measurements from the National Spherical Torus Experiment (NSTX) and is aimed at controlling plasma rotation using two different types of actuation: momentum from injected neutral beams and neoclassical toroidal viscosity generated by three-dimensional applied magnetic fields. Based on the data-driven model obtained, a feedback controller is designed, and predictive simulations using the TRANSP plasma transport code show that the controller is able to attain desired plasma rotation profiles given practical constraints on the actuators and the available measurements of rotation.
ISSN:0029-5515
1741-4326
DOI:10.1088/0029-5515/56/3/036023