Plasma rotation and NTM onset driven by central EC deposition in TCV tokamak (Contributo in atti di convegno)

Type
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  • Plasma rotation and NTM onset driven by central EC deposition in TCV tokamak (Contributo in atti di convegno) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1063/1.4864598 (literal)
Alternative label
  • S. Nowak (1); E. Lazzaro (1); O. Sauter (2); G. Canal (2); B. Duval (2); L. Federspiel (2); A. N. Karpushov (2); D. Kim (2); D. Raju (3); H. Reimerders (4); J. Rossel (4); D. Testa (4); D. Wagner (4); TCV Team (4) (2014)
    Plasma rotation and NTM onset driven by central EC deposition in TCV tokamak
    in RADIOFREQUENCY POWER IN PLASMAS: Proceedings of the 20th Topical Conference, Sorrento, Italy, 25-28 June 2013
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • S. Nowak (1); E. Lazzaro (1); O. Sauter (2); G. Canal (2); B. Duval (2); L. Federspiel (2); A. N. Karpushov (2); D. Kim (2); D. Raju (3); H. Reimerders (4); J. Rossel (4); D. Testa (4); D. Wagner (4); TCV Team (4) (literal)
Pagina inizio
  • 502 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.4864598 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume
  • RADIOFREQUENCY POWER IN PLASMAS: Proceedings of the 20th Topical Conference (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#volumeInCollana
  • 1580 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 Istituto di Fisica del Plasma CNR, Euratom Association, 20125 Milano, Italy - 2 Ecole Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas (CRPP), Association EURATOM-Confederation Suisse, 1015 Lausanne, Switzerland - 3 Institute for Plasma Research, Bhat, Gandhinagar, Gujarat, India - 4 Ecole Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas (CRPP), Association EURATOM-Confederation Suisse, 1015 Lausanne, Switzerland - (literal)
Titolo
  • Plasma rotation and NTM onset driven by central EC deposition in TCV tokamak (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
  • 978-0-7354-1210-1 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#curatoriVolume
  • Angelo A. Tuccillo and Silvio Ceccuzzi (literal)
Abstract
  • The effects of the central electron cyclotron heating (ECH) and current drive (ECCD) on the spontaneous plasma rotation and on the presence of Tearing Modes (TM), observed in the TCV tokamak[1], were recently investigated as an interplay between the toroidal velocity and NTM onset in absence of sawteeth, ELMs and error fields [2-3]. In a set of reproducible TCV discharges (Ip~ -150 kA, Bt~ -1.4 T, ne,av~ 1.5 1019 m-3, Te~ 3 keV and Ti~0.25 keV, q95~5.8) with both pure EC heating and current drive the cnt-Ip toroidal velocity was observed to be reduced with subsequent co-Ip appearance of 3/2 and 2/1 modes during the ramp up EC phases. The understanding of the capability of the on-axis EC power to modify the rotation profiles before and after the TM onset and of the sudden disappearance of 3/2 mode when 2/1 starts is the main purpose of this work. The velocity profile modifications are due to a direct effect of the EC absorbed power and also related to some variation of the perpendicular diffusion of the toroidal momentum and to magnetic braking effects of the kind of neoclassical toroidal viscosity (NTV) due to the NTM resonant field perturbations associated to the presence of TM. Numerical investigations are performed using a 1D toroidal momentum balance equation including contributions by external sources, as EC power, and NTV torques. Furthermore, the combined evolution of the 3/2 and 2/1 modes requires considering also coupling effects included in a generalized Rutherford equation for the modelling of the TM time growth. © 2014 AIP Publishing LLC (literal)
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