Time-dependent simulations of feedback stabilization of neoclassical tearing modes in KSTAR plasmas

Kyungjin Kim; Yong Su Na; Hyun Seok Kim; M. Maraschek; Y. S. Park; J. Stober; L. Terzolo; H. Zohm

doi:10.1016/j.fusengdes.2014.04.036

Time-dependent simulations of feedback stabilization of neoclassical tearing modes in KSTAR plasmas

Kyungjin Kim, Yong Su Na, Hyun Seok Kim, M. Maraschek, Y. S. Park, J. Stober, L. Terzolo, H. Zohm

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

A simulation is performed for feedback stabilization of neoclassical tearing mode (NTM) by electron cyclotron current drive (ECCD) for KSTAR in preparation for experiments. An integrated numerical system is constructed by coupling plasma transport, NTM stability, and heating and current drive modules and applied to a KSTAR plasma by assuming similar experimental conditions as ASDEX Upgrade to predict NTM behaviors in KSTAR. System identification is made with database produced by predictive simulations with this integrated numerical system so that three plasma response models are extracted which describe the relation between the EC poloidal launcher angle and the island width in KSTAR. Among them, the P1DI model exhibiting the highest fit accuracy is selected for designing a feedback controller based on the classical Proportional-Integral- Derivative (PID) concept. The controller is coupled with the integrated numerical system and applied to a simulation of NTM stabilization. It is observed that the controller can search and fully stabilize the mode even though the poloidal launch angle is misaligned with the island initially.

Original language	English
Pages (from-to)	859-866
Number of pages	8
Journal	Fusion Engineering and Design
Volume	89
Issue number	6
DOIs	https://doi.org/10.1016/j.fusengdes.2014.04.036
State	Published - Jun 2014
Externally published	Yes

Funding

This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIP) (No. 20080061900) and by R&D Program through the National Fusion Research Institute of Korea(NFRI) funded by the Government funds.

Funders	Funder number
Ministry of Science, ICT and Future Planning	20080061900
National Fusion Research Institute
National Research Foundation of Korea

Keywords

ECCD
Integrated simulation
KSTAR
Neoclassical tearing modes
PID control

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.fusengdes.2014.04.036

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title = "Time-dependent simulations of feedback stabilization of neoclassical tearing modes in KSTAR plasmas",

abstract = "A simulation is performed for feedback stabilization of neoclassical tearing mode (NTM) by electron cyclotron current drive (ECCD) for KSTAR in preparation for experiments. An integrated numerical system is constructed by coupling plasma transport, NTM stability, and heating and current drive modules and applied to a KSTAR plasma by assuming similar experimental conditions as ASDEX Upgrade to predict NTM behaviors in KSTAR. System identification is made with database produced by predictive simulations with this integrated numerical system so that three plasma response models are extracted which describe the relation between the EC poloidal launcher angle and the island width in KSTAR. Among them, the P1DI model exhibiting the highest fit accuracy is selected for designing a feedback controller based on the classical Proportional-Integral- Derivative (PID) concept. The controller is coupled with the integrated numerical system and applied to a simulation of NTM stabilization. It is observed that the controller can search and fully stabilize the mode even though the poloidal launch angle is misaligned with the island initially.",

keywords = "ECCD, Integrated simulation, KSTAR, Neoclassical tearing modes, PID control",

author = "Kyungjin Kim and Na, {Yong Su} and Kim, {Hyun Seok} and M. Maraschek and Park, {Y. S.} and J. Stober and L. Terzolo and H. Zohm",

year = "2014",

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doi = "10.1016/j.fusengdes.2014.04.036",

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AU - Kim, Kyungjin

AU - Na, Yong Su

AU - Kim, Hyun Seok

AU - Maraschek, M.

AU - Park, Y. S.

AU - Stober, J.

AU - Terzolo, L.

AU - Zohm, H.

PY - 2014/6

Y1 - 2014/6

N2 - A simulation is performed for feedback stabilization of neoclassical tearing mode (NTM) by electron cyclotron current drive (ECCD) for KSTAR in preparation for experiments. An integrated numerical system is constructed by coupling plasma transport, NTM stability, and heating and current drive modules and applied to a KSTAR plasma by assuming similar experimental conditions as ASDEX Upgrade to predict NTM behaviors in KSTAR. System identification is made with database produced by predictive simulations with this integrated numerical system so that three plasma response models are extracted which describe the relation between the EC poloidal launcher angle and the island width in KSTAR. Among them, the P1DI model exhibiting the highest fit accuracy is selected for designing a feedback controller based on the classical Proportional-Integral- Derivative (PID) concept. The controller is coupled with the integrated numerical system and applied to a simulation of NTM stabilization. It is observed that the controller can search and fully stabilize the mode even though the poloidal launch angle is misaligned with the island initially.

AB - A simulation is performed for feedback stabilization of neoclassical tearing mode (NTM) by electron cyclotron current drive (ECCD) for KSTAR in preparation for experiments. An integrated numerical system is constructed by coupling plasma transport, NTM stability, and heating and current drive modules and applied to a KSTAR plasma by assuming similar experimental conditions as ASDEX Upgrade to predict NTM behaviors in KSTAR. System identification is made with database produced by predictive simulations with this integrated numerical system so that three plasma response models are extracted which describe the relation between the EC poloidal launcher angle and the island width in KSTAR. Among them, the P1DI model exhibiting the highest fit accuracy is selected for designing a feedback controller based on the classical Proportional-Integral- Derivative (PID) concept. The controller is coupled with the integrated numerical system and applied to a simulation of NTM stabilization. It is observed that the controller can search and fully stabilize the mode even though the poloidal launch angle is misaligned with the island initially.

KW - ECCD

KW - Integrated simulation

KW - KSTAR

KW - Neoclassical tearing modes

KW - PID control

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ER -

Time-dependent simulations of feedback stabilization of neoclassical tearing modes in KSTAR plasmas

Abstract

Funding

Keywords

UN SDGs

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