Crucial issues of multi-beam feed-back control in fusion plasmas (Contributo in atti di convegno)

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  • Crucial issues of multi-beam feed-back control in fusion plasmas (Contributo in atti di convegno) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/1742-6596/25/1/027 (literal)
Alternative label
  • S Cirant (1), J Berrino (1), F Gandini (1), G Granucci (1), F Iannone (3), E Lazzaro (1), G D'Antona (2), D Farina (1), K Koppenburg (4), S Nowak (1) and G Ramponi (1) (2005)
    Crucial issues of multi-beam feed-back control in fusion plasmas
    in Third IAEA Technical Meeting on ECRH Physics and Technology in ITER, Como
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • S Cirant (1), J Berrino (1), F Gandini (1), G Granucci (1), F Iannone (3), E Lazzaro (1), G D'Antona (2), D Farina (1), K Koppenburg (4), S Nowak (1) and G Ramponi (1) (literal)
Pagina inizio
  • 223 (literal)
Pagina fine
  • 233 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://iopscience.iop.org/1742-6596/25/1/027 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume
  • Third IAEA Technical Meeting on ECRH Physics and Technology in ITER (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 25 (literal)
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  • 25 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • Journal of Physics Conference Series 25, 223-233 (2005) (literal)
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  • (1) Istituto di Fisica del Plasma, Association EURATOM-ENEA-CNR, via Cozzi 53, 20125 Milano, Italy (2) Politecnico di Milano, P.za L. Da Vinci 32, Milan Italy (3) Associazione EURATOM/ENEA sulla Fusione, Centro Ricerche Frascati, p.b. 65, 00044 Frascati Rome,Italy (4) Forschungszentrum Karlsruhe, Association EURATOM-FZK, IHM, D-76021 Karlsruhe, Germany (literal)
Titolo
  • Crucial issues of multi-beam feed-back control in fusion plasmas (literal)
Abstract
  • Proof of principle of feed-back controlled Electron Cyclotron Heating and Current Drive (ECH/ECCD), aiming at automatic limitation (or suppression) of Neoclassical Tearing Modes amplitude, has been achieved in a number of present machines. In addition to Neoclassical Tearing Mode stabilization, more applications of well-localized ECH/ECCD can be envisaged (saw-tooth crash control, current profile control, thermal barrier control, disruption mitigation). However, in order to be able to take a step forward towards the application of these techniques to burning plasmas, some crucial issues should be more deeply analyzed: multi-beam simultaneous action, control of deposition radii rdep, diagnostic of plasma reaction. So far the Electron Cyclotron Emission has been the most important tool to get localized information on plasma response, essential for both rdep and risland recognition, but its use in very hot burning plasmas within automatic control loops should be carefully verified. Assuming that plasma response is appropriately diagnosed, the next matter to be discussed concerns how to control rdep, since all techniques so far used, or proposed (plasma position, toroidal field, mechanical beam steering, gyrotron frequency tuning) have limitations or drawbacks. Finally, simultaneous multiple actions on many actuators (EC beams), concurring to automatic control of one single parameter (e.g. NTM amplitude) might be a challenging task for the controller, particularly in view of the fact that any effect of each beam becomes visible only when it is positioned very close to the right radius. All these interlinked aspects are discussed in the paper. (literal)
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