Electromagnetic modeling for the active control of MHD modes in RFX (Articolo in rivista)

Type
Label
  • Electromagnetic modeling for the active control of MHD modes in RFX (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • G. Marchiori 1, M. Cavinato 4, A. Masiello 2, R. Paccagnella 1 (2003)
    Electromagnetic modeling for the active control of MHD modes in RFX
    in Fusion engineering and design
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • G. Marchiori 1, M. Cavinato 4, A. Masiello 2, R. Paccagnella 1 (literal)
Pagina inizio
  • 691 (literal)
Pagina fine
  • 696 (literal)
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  • The RFX experiment, is the most important machine of Reversed Field Pinch (RFP) type in the world. This magnetic configuration is actively studed in Europe, USA and Japan for its potential as a scheme of low magnetic field reactor and for interesting scientific properties of the plasma. In the paper an original electromagnetic model specifically developed for the design of an active control system of plasma MHD modes is presented. The model proved sufficiently flexible to be easily modified to describe EXTRAP-T2R, another RFP device operating at KTH in Stockholm. A validation experimental campaign was successfully carried out on T2R in the last months (M. Cavinato et al., “First results of an integrated multi-variable electromagnetic model for resistive wall mode control in fusion devices”, 21st SOFE, S. Diego, October 2003). FED is one of the two major journals for publication of engineering research results in the field of controlled thermonuclear fusion. (literal)
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  • 66-68 (literal)
Rivista
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  • Università di Padova, CNR ed ENEA hanno costituito il Consorzio RFX per realizzare congiuntamente attività di ricerca sulla fusione nucleare controllata. Il personale resta dipendente dal proprio ente, precisato nel campo (literal)
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  • The new RFX load assembly is characterized by a thin copper shell with a 50 ms time constant for the vertical field penetration, and 192 saddle coils, individually controlled, which cover the whole surface of the torus. The active control of Resistive Wall Modes is considered a basic issue to extend the pulse duration to its nominal value. Experimental results are expected to be of interest for Tokamak devices, as well. An open loop state space model was developed in view of the simultaneous control of different harmonic components of the magnetic field. It integrates a model of the saddle coil system and a linear model of the plasma MHD evolution. A lumped electromagnetic parameter representation of the saddle coil system was adopted and the coupling terms were calculated taking into account the presence of passive conductors such as vessel and shell. The plasma MHD behaviour is given in terms of the harmonic components, including the aliasing effects (“sidebands”) due to the “finite” number of actuators and sensors. The state space representation was chosen since it is particularly suited for the design of multivariable control system and is numerically more robust. Reduction techniques have also been tested in order to obtain lower order models for the control system design while retaining the basic static and dynamic properties. (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • 1 CNR, 2 UniPD, 3 ENEA, 4 Consorzio RFX (dipendenti), (i dipendenti di 1-2-3 sono anche affiliati al Consorzio) (literal)
Titolo
  • Electromagnetic modeling for the active control of MHD modes in RFX (literal)
Abstract
  • The new RFX load assembly is characterized by a thin copper shell with a 50 ms time constant for the vertical field penetration, and 192 saddle coils, individually controlled, which cover the whole surface of the torus. The active control of Resistive Wall Modes is considered a basic issue to extend the pulse duration to its nominal value. Experimental results are expected to be of interest for Tokamak devices, as well. An open loop state space model was developed in view of the simultaneous control of different harmonic components of the magnetic field. It integrates a model of the saddle coil system and a linear model of the plasma MHD evolution. A lumped electromagnetic parameter representation of the saddle coil system was adopted and the coupling terms were calculated taking into account the presence of passive conductors such as vessel and shell. The plasma MHD behaviour is given in terms of the harmonic components, including the aliasing effects (“sidebands”) due to the “finite” number of actuators and sensors. The state space representation was chosen since it is particularly suited for the design of multivariable control system and is numerically more robust. Reduction techniques have also been tested in order to obtain lower order models for the control system design while retaining the basic static and dynamic properties. (literal)
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