A model-based technique for integrated real-time profile control in the JET tokamak

L. Laborde (Corresponding Author), D. Mazon, D. Moreau;, A. Murari, R. Felton, L. Zabeo, R. Albanese, M. Ariola, J. Bucalossi, F. Crisanti, M. de Baar, G. de Tommasi, P. de Vries, E. Joffrin, M. Lennholm, X. Litaudon, A. Pironti, Tuomas Tala, A. Tuccillo

Research output: Contribution to journalArticleScientificpeer-review

63 Citations (Scopus)

Abstract

This paper describes a new technique which has been implemented on the JET tokamak to investigate integrated real-time control of several plasma profiles simultaneously (such as current, temperature and pressure) and reports the results of the first experimental tests. The profiles are handled through their projection on a suitable basis of functions according to the Galerkin scheme. Their response to three actuators (heating and current drive powers injected in the plasma) is linearized in an experimentally deduced multi-input multi-output model. The singular value decomposition of this model operator allows us to design a distributed-parameter real-time controller which maximizes the steady state decoupling of the multiple feedback loops. It enables us to control several coupled profiles simultaneously, with some degree of fuzziness to let the plasma evolve towards an accessible non-linear state which is the closest to the requested one, despite a limited number of actuators. The first experiments using these techniques show that different current and electron temperature profiles can be obtained and sustained by the controller during a closed-loop operation time window. Future improvements and perspectives are briefly mentioned.

Original languageEnglish
Pages (from-to)155 - 183
Number of pages29
JournalPlasma Physics and Controlled Fusion
Volume47
Issue number1
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

Fingerprint

Integrated control
Real time control
Plasmas
controllers
Actuators
profiles
actuators
Controllers
Electron temperature
Singular value decomposition
decoupling
temperature profiles
projection
electron energy
Feedback
decomposition
Heating
operators
heating
temperature

Keywords

  • JET
  • plasma
  • fusion energy
  • fusion reactors
  • tokamak

Cite this

Laborde, L., Mazon, D., Moreau;, D., Murari, A., Felton, R., Zabeo, L., ... Tuccillo, A. (2005). A model-based technique for integrated real-time profile control in the JET tokamak. Plasma Physics and Controlled Fusion, 47(1), 155 - 183. https://doi.org/10.1088/0741-3335/47/1/010
Laborde, L. ; Mazon, D. ; Moreau;, D. ; Murari, A. ; Felton, R. ; Zabeo, L. ; Albanese, R. ; Ariola, M. ; Bucalossi, J. ; Crisanti, F. ; de Baar, M. ; de Tommasi, G. ; de Vries, P. ; Joffrin, E. ; Lennholm, M. ; Litaudon, X. ; Pironti, A. ; Tala, Tuomas ; Tuccillo, A. / A model-based technique for integrated real-time profile control in the JET tokamak. In: Plasma Physics and Controlled Fusion. 2005 ; Vol. 47, No. 1. pp. 155 - 183.
@article{c622ebd96d834122aaa8e1de7cebbde2,
title = "A model-based technique for integrated real-time profile control in the JET tokamak",
abstract = "This paper describes a new technique which has been implemented on the JET tokamak to investigate integrated real-time control of several plasma profiles simultaneously (such as current, temperature and pressure) and reports the results of the first experimental tests. The profiles are handled through their projection on a suitable basis of functions according to the Galerkin scheme. Their response to three actuators (heating and current drive powers injected in the plasma) is linearized in an experimentally deduced multi-input multi-output model. The singular value decomposition of this model operator allows us to design a distributed-parameter real-time controller which maximizes the steady state decoupling of the multiple feedback loops. It enables us to control several coupled profiles simultaneously, with some degree of fuzziness to let the plasma evolve towards an accessible non-linear state which is the closest to the requested one, despite a limited number of actuators. The first experiments using these techniques show that different current and electron temperature profiles can be obtained and sustained by the controller during a closed-loop operation time window. Future improvements and perspectives are briefly mentioned.",
keywords = "JET, plasma, fusion energy, fusion reactors, tokamak",
author = "L. Laborde and D. Mazon and D. Moreau; and A. Murari and R. Felton and L. Zabeo and R. Albanese and M. Ariola and J. Bucalossi and F. Crisanti and {de Baar}, M. and {de Tommasi}, G. and {de Vries}, P. and E. Joffrin and M. Lennholm and X. Litaudon and A. Pironti and Tuomas Tala and A. Tuccillo",
year = "2005",
doi = "10.1088/0741-3335/47/1/010",
language = "English",
volume = "47",
pages = "155 -- 183",
journal = "Plasma Physics and Controlled Fusion",
issn = "0741-3335",
publisher = "Institute of Physics IOP",
number = "1",

}

Laborde, L, Mazon, D, Moreau;, D, Murari, A, Felton, R, Zabeo, L, Albanese, R, Ariola, M, Bucalossi, J, Crisanti, F, de Baar, M, de Tommasi, G, de Vries, P, Joffrin, E, Lennholm, M, Litaudon, X, Pironti, A, Tala, T & Tuccillo, A 2005, 'A model-based technique for integrated real-time profile control in the JET tokamak', Plasma Physics and Controlled Fusion, vol. 47, no. 1, pp. 155 - 183. https://doi.org/10.1088/0741-3335/47/1/010

A model-based technique for integrated real-time profile control in the JET tokamak. / Laborde, L. (Corresponding Author); Mazon, D.; Moreau;, D.; Murari, A.; Felton, R.; Zabeo, L.; Albanese, R.; Ariola, M.; Bucalossi, J.; Crisanti, F.; de Baar, M.; de Tommasi, G.; de Vries, P.; Joffrin, E.; Lennholm, M.; Litaudon, X.; Pironti, A.; Tala, Tuomas; Tuccillo, A.

In: Plasma Physics and Controlled Fusion, Vol. 47, No. 1, 2005, p. 155 - 183.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - A model-based technique for integrated real-time profile control in the JET tokamak

AU - Laborde, L.

AU - Mazon, D.

AU - Moreau;, D.

AU - Murari, A.

AU - Felton, R.

AU - Zabeo, L.

AU - Albanese, R.

AU - Ariola, M.

AU - Bucalossi, J.

AU - Crisanti, F.

AU - de Baar, M.

AU - de Tommasi, G.

AU - de Vries, P.

AU - Joffrin, E.

AU - Lennholm, M.

AU - Litaudon, X.

AU - Pironti, A.

AU - Tala, Tuomas

AU - Tuccillo, A.

PY - 2005

Y1 - 2005

N2 - This paper describes a new technique which has been implemented on the JET tokamak to investigate integrated real-time control of several plasma profiles simultaneously (such as current, temperature and pressure) and reports the results of the first experimental tests. The profiles are handled through their projection on a suitable basis of functions according to the Galerkin scheme. Their response to three actuators (heating and current drive powers injected in the plasma) is linearized in an experimentally deduced multi-input multi-output model. The singular value decomposition of this model operator allows us to design a distributed-parameter real-time controller which maximizes the steady state decoupling of the multiple feedback loops. It enables us to control several coupled profiles simultaneously, with some degree of fuzziness to let the plasma evolve towards an accessible non-linear state which is the closest to the requested one, despite a limited number of actuators. The first experiments using these techniques show that different current and electron temperature profiles can be obtained and sustained by the controller during a closed-loop operation time window. Future improvements and perspectives are briefly mentioned.

AB - This paper describes a new technique which has been implemented on the JET tokamak to investigate integrated real-time control of several plasma profiles simultaneously (such as current, temperature and pressure) and reports the results of the first experimental tests. The profiles are handled through their projection on a suitable basis of functions according to the Galerkin scheme. Their response to three actuators (heating and current drive powers injected in the plasma) is linearized in an experimentally deduced multi-input multi-output model. The singular value decomposition of this model operator allows us to design a distributed-parameter real-time controller which maximizes the steady state decoupling of the multiple feedback loops. It enables us to control several coupled profiles simultaneously, with some degree of fuzziness to let the plasma evolve towards an accessible non-linear state which is the closest to the requested one, despite a limited number of actuators. The first experiments using these techniques show that different current and electron temperature profiles can be obtained and sustained by the controller during a closed-loop operation time window. Future improvements and perspectives are briefly mentioned.

KW - JET

KW - plasma

KW - fusion energy

KW - fusion reactors

KW - tokamak

U2 - 10.1088/0741-3335/47/1/010

DO - 10.1088/0741-3335/47/1/010

M3 - Article

VL - 47

SP - 155

EP - 183

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 1

ER -