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:
-
- Lehigh Univ., Bethlehem, PA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Publication Date:
- 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.
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.
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.
@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}
}
Works referenced in this record:
TRANSP-based closed-loop simulations of current profile optimal regulation in NSTX-Upgrade
dataset, January 2019
- Ilhan, Z.; D., Boyer; Schuster, E.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Works referencing / citing this record:
TRANSP-based closed-loop simulations of current profile optimal regulation in NSTX-Upgrade
dataset, January 2019
- Ilhan, Z.; D., Boyer; Schuster, E.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)