Active control of multiple resistive wall modes (Articolo in rivista)

Type
Label
  • Active control of multiple resistive wall modes (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0741-3335/47/12B/S03 (literal)
Alternative label
  • Brunsell R; D Yadikin; D Gregoratto; R Paccagnella; Y Q Liu; T Bolzonella; M Cecconello; J R Drake; M Kuldkepp; G Manduchi; G Marchiori; L Marrelli; P Martin; S Menmuir; S Ortolani; E Rachlew; G Spizzo; P Zanca (2005)
    Active control of multiple resistive wall modes
    in Plasma physics and controlled fusion (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Brunsell R; D Yadikin; D Gregoratto; R Paccagnella; Y Q Liu; T Bolzonella; M Cecconello; J R Drake; M Kuldkepp; G Manduchi; G Marchiori; L Marrelli; P Martin; S Menmuir; S Ortolani; E Rachlew; G Spizzo; P Zanca (literal)
Pagina inizio
  • B25 (literal)
Pagina fine
  • B36 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 47 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • SI Supplement 12B (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Alfvén Laboratory, Association EURATOM-VR, Royal Institute of Technology, 10044 Stockholm, Sweden / Consorzio RFX, Associazione EURATOM-ENEA sulla fusione, 35127 Padova, Italy / Department of Applied Mechanics, Association EURATOM-VR, Chalmers University of Technology, 41296 Göteborg, Sweden / Department of Physics, Association EURATOM-VR, Royal Institute of Technology, 10691 Stockholm, Sweden (literal)
Titolo
  • Active control of multiple resistive wall modes (literal)
Abstract
  • A two-dimensional array of saddle coils at Mc poloidal and Nc toroidal positions is used on the EXTRAP T2R reversed-field pinch (Brunsell P R et al 2001 Plasma Phys. Control. Fusion 43 1457) to study active control of resistive wall modes (RWMs). Spontaneous growth of several RWMs with poloidal mode number m = 1 and different toroidal mode number n is observed experimentally, in agreement with linear MHD modelling. The measured plasma response to a controlled coil field and the plasma response computed using the linear circular cylinder MHD model are in quantitive agreement. Feedback control introduces a linear coupling of modes with toroidal mode numbers n, n' that fulfil the condition |n - n'| = Nc. Pairs of coupled unstable RWMs are present in feedback experiments with an array of Mc × Nc = 4 × 16 coils. Using intelligent shell feedback, the coupled modes are generally not controlled even though the field is suppressed at the active coils. A better suppression of coupled modes may be achieved in the case of rotating modes by using the mode control feedback scheme with individually set complex gains. In feedback with a larger array of Mc × Nc = 4 × 32 coils, the coupling effect largely disappears, and with this array, the main internal RWMs n = -11, -10, +5, +6 are all simultaneously suppressed throughout the discharge (7-8 wall times). With feedback there is a two-fold extension of the pulse length, compared to discharges without feedback. (literal)
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