Experimental and theoretical studies of active control of resistive wall mode growth in the EXTRAP T2R reversed-field pinch (Articolo in rivista)

Type
Label
  • Experimental and theoretical studies of active control of resistive wall mode growth in the EXTRAP T2R reversed-field pinch (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0029-5515/45/7/002 (literal)
Alternative label
  • Drake J.R.; P.R. Brunsell; D. Yadikin; M. Cecconello; J.A. Malmberg ; D. Gregoratto; R. Paccagnella; T. Bolzonella; G. Manduchi; L. Marrelli; S. Ortolani; G. Spizzo; P. Zanca; A. Bondeson; Y.Q. Liu; (2005)
    Experimental and theoretical studies of active control of resistive wall mode growth in the EXTRAP T2R reversed-field pinch
    in Nuclear fusion
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Drake J.R.; P.R. Brunsell; D. Yadikin; M. Cecconello; J.A. Malmberg ; D. Gregoratto; R. Paccagnella; T. Bolzonella; G. Manduchi; L. Marrelli; S. Ortolani; G. Spizzo; P. Zanca; A. Bondeson; Y.Q. Liu; (literal)
Pagina inizio
  • 557 (literal)
Pagina fine
  • 564 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 45 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • Issue 7 (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Drake J.R., Alfven Laboratory, KTH, EURATOM VR Association, Stockholm, Sweden P.R. Brunsell Alfven Laboratory, KTH, EURATOM VR Association, Stockholm, Sweden D. Yadikin Alfven Laboratory, KTH, EURATOM VR Association, Stockholm, Sweden M. Cecconello Alfven Laboratory, KTH, EURATOM VR Association, Stockholm, Sweden J.A. Malmberg Alfven Laboratory, KTH, EURATOM VR Association, Stockholm, Sweden D. Gregoratto Alfven Laboratory, KTH, EURATOM VR Association, Stockholm, Sweden R. Paccagnella Consorzio RFX, EURATOM ENEA Association, Padova, Italy T. Bolzonella Consorzio RFX, EURATOM ENEA Association, Padova, Italy G. Manduchi Consorzio RFX, EURATOM ENEA Association, Padova, Italy L. Marrelli Consorzio RFX, EURATOM ENEA Association, Padova, Italy S. Ortolani Consorzio RFX, EURATOM ENEA Association, Padova, Italy G. Spizzo Consorzio RFX, EURATOM ENEA Association, Padova, Italy P. Zanca Consorzio RFX, EURATOM ENEA Association, Padova, Italy A. Bondeson Department of Electromagnetics, CTH, EURATOM VR Association, Gothenburg, Sweden Y.Q. Liu Department of Electromagnetics, CTH, EURATOM VR Association, Gothenburg, Sweden (literal)
Titolo
  • Experimental and theoretical studies of active control of resistive wall mode growth in the EXTRAP T2R reversed-field pinch (literal)
Abstract
  • Active feedback control of resistive wall modes (RWMs) has been demonstrated in the EXTRAP T2R reversed-field pinch experiment. The control system includes a sensor consisting of an array of magnetic coils (measuring mode harmonics) and an actuator consisting of a saddle coil array (producing control harmonics). Closed-loop (feedback) experiments using a digital controller based on a real time Fourier transform of sensor data have been studied for cases where the feedback gain was constant and real for all harmonics (corresponding to an intelligent-shell) and cases where the feedback gain could be set for selected harmonics, with both real and complex values (targeted harmonics). The growth of the dominant RWMs can be reduced by feedback for both the intelligent-shell and targeted-harmonic control systems. Because the number of toroidal positions of the saddle coils in the array is half the number of the sensors, it is predicted and observed experimentally that the control harmonic spectrum has sidebands. Individual unstable harmonics can be controlled with real gains. However if there are two unstable mode harmonics coupled by the sideband effect, control is much less effective with real gains. According to the theory, complex gains give better results for (slowly) rotating RWMs, and experiments support this prediction. In addition, open loop experiments have been used to observe the effects of resonant field errors applied to unstable, marginally stable and robustly stable modes. The observed effects of field errors are consistent with the thin-wall model, where mode growth is proportional to the resonant field error amplitude and the wall penetration time for that mode harmonic. (literal)
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