A two-time-scale dynamic-model approach for magnetic and kinetic profile control in advanced tokamak scenarios on JET

被引：73

作者：

Moreau, D. ^{[1
]}

Mazon, D. ^{[1
]}

Ariola, M. ^{[2
]}

De Tommasi, G. ^{[2
]}

Laborde, L. ^{[3
]}

Piccolo, F. ^{[3
]}

Sartori, F. ^{[3
]}

Tala, T. ^{[4
]}

Zabeo, L. ^{[3
]}

Boboc, A. ^{[3
]}

Bouvier, E. ^{[5
]}

Brix, M. ^{[3
]}

Brzozowski, J. ^{[6
]}

Challis, C. D. ^{[3
]}

Cocilovo, V. ^{[7
]}

Cordoliani, V. ^{[5
]}

Crisanti, F. ^{[7
]}

De la Luna, E. ^{[8
]}

Felton, R.

Hawkes, N. ^{[3
]}

King, R. ^{[3
]}

Litaudon, X. ^{[1
]}

Loarer, T. ^{[1
]}

Mailloux, J. ^{[3
]}

Mayoral, M. ^{[3
]}

Nunes, I. ^{[9
]}

Surrey, E. ^{[3
]}

Zimmerman, O. ^{[10
]}

机构：

[1] IRFM, CEA, F-13108 St Paul Les Durance, France

[2] Univ Naples Federico 2, Euratom ENEA CREATE Assoc, I-80125 Naples, Italy

[3] EURATOM, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[4] VTT, Euratom Tekes Assoc, FIN-02044 Espoo, Finland

[5] Ecole Polytech, Route Saclay, F-91128 Palaiseau, France

[6] KTH, Dept Phys, Euratom VR Assoc, SE-10691 Stockholm, Sweden

[7] Euratom ENEA Assoc, I-00044 Frascati, Italy

[8] Euratom CIEMAT Assoc, E-28040 Madrid, Spain

[9] IST, Ctr Fusao Nucl, Euratom IST Assoc, P-1049001 Lisbon, Portugal

[10] Forschungszentrum Julich, IPP, Euratom FZJ Assoc, D-52425 Julich, Germany

来源：

NUCLEAR FUSION | 2008年 / 48卷 / 10期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1088/0029-5515/48/10/106001

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Real-time simultaneous control of several radially distributed magnetic and kinetic plasma parameters is being investigated on JET, in view of developing integrated control of advanced tokamak scenarios. This paper describes the new model-based profile controller which has been implemented during the 2006-2007 experimental campaigns. The controller aims to use the combination of heating and current drive (H&CD) systems-and optionally the poloidal field (PF) system-in an optimal way to regulate the evolution of plasma parameter profiles such as the safety factor, q(x), and gyro-normalized temperature gradient,. rho*(Te)(x). In the first part of the paper, a technique for the experimental identification of a minimal dynamic plasma model is described, taking into account the physical structure and couplings of the transport equations, but making no quantitative assumptions on the transport coefficients or on their dependences. To cope with the high dimensionality of the state space and the large ratio between the time scales involved, the model identification procedure and the controller design both make use of the theory of singularly perturbed systems by means of a two-time-scale approximation. The second part of the paper provides the theoretical basis for the controller design. The profile controller is articulated around two composite feedback loops operating on the magnetic and kinetic time scales, respectively, and supplemented by a feedforward compensation of density variations. For any chosen set of target profiles, the closest self-consistent state achievable with the available actuators is uniquely defined. It is reached, with no steady state offset, through a near-optimal

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页数：38

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