U.S. Department of EnergyOffice of Scientific and Technical Information
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.
- Authors:
-
- OSTI
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- U. S. Department of Energy
- Subject:
- NSTX-U; current profile control; plasma control
- OSTI Identifier:
- 1562086
- DOI:
- https://doi.org/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:https://doi.org/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:https://doi.org/10.11578/1562086. https://www.osti.gov/servlets/purl/1562086. Pub date:Thu Feb 28 23:00:00 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 = {Thu Feb 28 23:00:00 EST 2019},
month = {Thu Feb 28 23:00:00 EST 2019}
}