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- W2148045315 abstract "Abstract The sawtooth instability is associated with the triggering of neo-classical tearing modes, core fuelling, α -confinement and the exhaust of thermal helium. Sawtooth control is therefore important for optimal reactor performance in ELMy H-modes. Control schemes for the sawtooth period have been published in the literature, but the systematic design of high-performance controllers (yielding accurate and fast convergent responses) has not been addressed. In this work, three control strategies for high-performance sawtooth control are presented using electron cyclotron current drive (ECCD). Both degrees of freedom of the ECCD actuator will be explored and combined with advanced controller designs. First, the ECCD deposition location is used as a control variable, for which a gain-scheduled feedback controller and static feedforward control is derived. Second, the use of the driven current as a control variable is explored, and a simple controller is designed based on the identified dynamics. In the third approach both control variables are joined in an overall controller design, which enables the combination of high-performance control of the sawtooth period and control of the gyrotron power. Time-domain simulations with a combined Kadomtsev–Porcelli sawtooth model show that each strategy obtains a better closed-loop performance than standard linear feedback techniques on merely the deposition location." @default.
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- W2148045315 date "2012-07-01" @default.
- W2148045315 modified "2023-10-16" @default.
- W2148045315 title "Sawtooth period control strategies and designs for improved performance" @default.
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- W2148045315 doi "https://doi.org/10.1088/0029-5515/52/7/074005" @default.
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