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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. These high-fidelity closed-loop simulations, which are a critical step before experimental implementation and testing, are enabled by a flexible framework recentlydeveloped to perform feedback control design and simulation in TRANSP.

Creator(s)/Author(s):
; ;
Publication Date:
Product Type:
Dataset
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
U. S. Department of Energy
Keywords:
NSTX-U; plasma control; current profile control
OSTI Identifier:
1562086
DOI:
10.11578/1562086

Citation Formats

Ilhan, Z O, D, Boyer M, and Schuster, E. TRANSP-based closed-loop simulations of current profile optimal regulation in NSTX-Upgrade. United States: N. p., 2019. Web. doi:10.11578/1562086.
Ilhan, Z O, D, Boyer M, & Schuster, E. TRANSP-based closed-loop simulations of current profile optimal regulation in NSTX-Upgrade. United States. doi:10.11578/1562086.
Ilhan, Z O, D, Boyer M, and Schuster, E. 2019. "TRANSP-based closed-loop simulations of current profile optimal regulation in NSTX-Upgrade". United States. doi:10.11578/1562086. https://www.osti.gov/servlets/purl/1562086. Pub date:Fri Mar 01 00:00:00 EST 2019
@article{osti_1562086,
title = {TRANSP-based closed-loop simulations of current profile optimal regulation in NSTX-Upgrade},
author = {Ilhan, Z O and D, Boyer M and Schuster, E},
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. These high-fidelity closed-loop simulations, which are a critical step before experimental implementation and testing, are enabled by a flexible framework recentlydeveloped to perform feedback control design and simulation in TRANSP.},
doi = {10.11578/1562086},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {3}
}

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