TRANSP-based closed-loop simulations of current profile optimal regulation in NSTX-Upgrade

doi:10.1016/j.fusengdes.2019.01.021

Title: TRANSP-based closed-loop simulations of current profile optimal regulation in NSTX-Upgrade

Abstract

Active control of the toroidal current density profile is critical for the upgraded National Spherical Torus eXperiment device (NSTX-U) to maintain operation at the desired high-performance, MHD-stable, plasma regime. Initial efforts towards current density profile control have led to the development of a control-oriented, physics-based, plasma-response model, which combines the magnetic diffusion equation with empirical correlations for the kinetic profiles and the non-inductive current sources. The developed control-oriented model has been successfully tailored to the NSTX-U geometry and actuators. Moreover, a series of efforts have been made towards the design of model-based controllers, including a linear-quadratic-integral optimal control strategy that can regulate the current density profile around a prescribed target profile while rejecting disturbances. In this work, the tracking performance of the proposed current-profile optimal controller is tested in numerical simulations based on the physics-oriented code TRANSP. Furthermore, these high-fidelity closed-loop simulations, which are a critical step before experimental implementation and testing, are enabled by a flexible framework recently developed to perform feedback control design and simulation in TRANSP.

Authors:

Ilhan, Zeki O. ^[1]; Boyer, Mark D. ^[2];

^[1]

Lehigh Univ., Bethlehem, PA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Publication Date:: 2019-02-19

Research Org.:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1503680

Alternate Identifier(s):: OSTI ID: 1557897

Grant/Contract Number:: AC02-09CH11466

Resource Type:: Accepted Manuscript

Journal Name:: Fusion Engineering and Design

Additional Journal Information:: Journal Volume: 146; Journal ID: ISSN 0920-3796

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Plasma control; Current profile control; Model-based control; Optimal control; TRANSP-based simulation

Citation Formats


                    Ilhan, Zeki O., Boyer, Mark D., and Schuster, Eugenio. TRANSP-based closed-loop simulations of current profile optimal regulation in NSTX-Upgrade.  United States: N. p., 2019. 
        Web.  doi:10.1016/j.fusengdes.2019.01.021.

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                    Ilhan, Zeki O., Boyer, Mark D., & Schuster, Eugenio. TRANSP-based closed-loop simulations of current profile optimal regulation in NSTX-Upgrade.  United States.  doi:10.1016/j.fusengdes.2019.01.021.

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                    Ilhan, Zeki O., Boyer, Mark D., and Schuster, Eugenio. Tue .  
        "TRANSP-based closed-loop simulations of current profile optimal regulation in NSTX-Upgrade".  United States.  doi:10.1016/j.fusengdes.2019.01.021.  https://www.osti.gov/servlets/purl/1503680.

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@article{osti_1503680,

  title        = {TRANSP-based closed-loop simulations of current profile optimal regulation in NSTX-Upgrade},

  author       = {Ilhan, Zeki O. and Boyer, Mark D. and Schuster, Eugenio},

  abstractNote = {Active control of the toroidal current density profile is critical for the upgraded National Spherical Torus eXperiment device (NSTX-U) to maintain operation at the desired high-performance, MHD-stable, plasma regime. Initial efforts towards current density profile control have led to the development of a control-oriented, physics-based, plasma-response model, which combines the magnetic diffusion equation with empirical correlations for the kinetic profiles and the non-inductive current sources. The developed control-oriented model has been successfully tailored to the NSTX-U geometry and actuators. Moreover, a series of efforts have been made towards the design of model-based controllers, including a linear-quadratic-integral optimal control strategy that can regulate the current density profile around a prescribed target profile while rejecting disturbances. In this work, the tracking performance of the proposed current-profile optimal controller is tested in numerical simulations based on the physics-oriented code TRANSP. Furthermore, these high-fidelity closed-loop simulations, which are a critical step before experimental implementation and testing, are enabled by a flexible framework recently developed to perform feedback control design and simulation in TRANSP.},

  doi          = {10.1016/j.fusengdes.2019.01.021},

  journal      = {Fusion Engineering and Design},

  number       = ,

  volume       = 146,

  place        = {United States},

  year         = {2019},

  month        = {2}

}

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DOI: 10.1016/j.fusengdes.2019.01.021

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