ECRH at high heating power density in FTU tokamak (Articolo in rivista)

Type
Label
  • ECRH at high heating power density in FTU tokamak (Articolo in rivista) (literal)
Anno
  • 2001-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/S0920-3796(00)00509-3 (literal)
Alternative label
  • S Cirant (a), , A Airoldi (a), L Bertalot (b), A Bruschi (a), G Bracco (b), P Buratti (b), G Cenacchi (c), B Esposito (b), G Granucci (a), H Kroegler (b), E Lazzaro (a), S Nowak (a), G Ramponi (a), C Sozzi (a), O Tudisco (b), M Zerbini(b), IFP Group (a), FTU Team (b) (2001)
    ECRH at high heating power density in FTU tokamak
    in Fusion engineering and design
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • S Cirant (a), , A Airoldi (a), L Bertalot (b), A Bruschi (a), G Bracco (b), P Buratti (b), G Cenacchi (c), B Esposito (b), G Granucci (a), H Kroegler (b), E Lazzaro (a), S Nowak (a), G Ramponi (a), C Sozzi (a), O Tudisco (b), M Zerbini(b), IFP Group (a), FTU Team (b) (literal)
Pagina inizio
  • 301 (literal)
Pagina fine
  • 308 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.sciencedirect.com/science/article/pii/S0920379600005093 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 53 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (a) Istituto di Fisica del Plasma del CNR, Associazione EURATOM-ENEA-CNR, Via R. Cozzi 53, Milano, Italy (b) Centro Ricerche Energia ENEA-Frascati-Associazione EURATOM-ENEA-CNR sulla Fusione, Frascati, Italy (c) Centro Ricerche Energia ENEA, Via Don Fiammelli 2, Bologna, Italy (literal)
Titolo
  • ECRH at high heating power density in FTU tokamak (literal)
Abstract
  • Plasma absorption at the fundamental EC resonance of e.m. waves at 140 GHz, 0.8 MW, Ordinary mode, provides in the FTU tokamak a localized (minimum deltar similar or equal to2.5 cm) and intense (up to similar or equal to 100 MW/m(3)) heat source for the electrons. It is shown that at high density (similar or equal to 10(20) m gamma - (-3)) ions are heated (DeltaT(i)/T-i = 0.25) by collisional e - i energy transfer and assuming ion thermal diffusivity about three times larger (at most) than predictions in order to account ;for the observed T-i. Off-center localization (r(abs)/a similar or equal to 0.2) of the ECRH heat source changes the electron temperature (and current density) profile in a way to fully stabilize sawteeth. On-axis absorption accelerates the sawtooth crash repetition rate if P-ecrh less than or equal to P-oh, but with P-ecrh > P-oh the sawtooth period is increased. A critical shear model for the sawtooth crash repetition rate is shown to be in agreement with its experimental dependence on resonance position and heating power. In discharges characterized by a flat temperature profile in the ohmic phase, ECRH may de-stabilize tearing modes of different order, with a strong degradation of core energy confinement. (C) 2001 Published by Elsevier Science B.V. (literal)
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