Critical temperature gradient signatures in heat wave propagation across Internal Transport Barriers in JET (Articolo in rivista)

Type
Label
  • Critical temperature gradient signatures in heat wave propagation across Internal Transport Barriers in JET (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1063/1.2772618 (literal)
Alternative label
  • Alessandro Casati (1,2) ;? P. Mantica (1); D. Van Eester (3); N. Hawkes (4); F. Imbeaux (5); E. Joffrin (5); A. Marinoni (6); F. Ryter (7); A. Salmi (8); T. Tala (9); P. De Vries (4) ; and JET EFDA contributorsb (2007)
    Critical temperature gradient signatures in heat wave propagation across Internal Transport Barriers in JET
    in Physics of plasmas
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Alessandro Casati (1,2) ;? P. Mantica (1); D. Van Eester (3); N. Hawkes (4); F. Imbeaux (5); E. Joffrin (5); A. Marinoni (6); F. Ryter (7); A. Salmi (8); T. Tala (9); P. De Vries (4) ; and JET EFDA contributorsb (literal)
Pagina inizio
  • 092393 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://pop.aip.org/resource/1/phpaen/v14/i9/p092303_s1 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 14 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) Istituto di Fisica del Plasma \"P. Caldirola,\" Associazione Euratom-ENEA-CNR, Via Cozzi 53, 20125 Milano, Italy (2) Dipartimento di Ingegneria Nucleare, Politecnico di Milano, Via Ponzio 34/3, 20133 Milano, Italy (3) LPP-ERM/KMS, Association Euratom-Belgian State, TEC, B-1000 Brussels, Belgium (4) Culham Science Centre, EURATOM/UKAEA Fusion Association, Abingdon OX14 3DB, United Kingdom (5) Association Euratom-CEA, CEA-DSM-DRFC Cadarache, 13108, St. Paul-lez-Durance Cedex, France (6) Association Euratom-Confédération Suisse, CRPP, EPFL, CH 1015, Lausanne, Switzerland (7) Max-Planck Insitut fur Plasmaphysik, Euratom Association, 85748 Garching, Germany (8) Helsinki University of Technology, Association Euratom-TEKES, P.O. Box 2200, Finland (9) Association Euratom-TEKES, VTT, P.O. Box 1000, FIN-02044 VTT, Finland (literal)
Titolo
  • Critical temperature gradient signatures in heat wave propagation across Internal Transport Barriers in JET (literal)
Abstract
  • New results on electron heat wave propagation using ion cyclotron resonance heating power modulation in the Joint European Torus (JET) [P. H. Rebut , Nucl. Fusion 25, 1011 (1985)] plasmas characterized by internal transport barriers (ITBs) are presented. The heat wave generated outside the ITB, and traveling across it, always experiences a strong damping in the ITB layer, demonstrating a low level of transport and loss of stiffness. In some cases, however, the heat wave is strongly inflated in the region just outside the ITB, showing features of convective-like behavior. In other cases, a second maximum in the perturbation amplitude is generated close to the ITB foot. Such peculiar types of behavior can be explained on the basis of the existence of a critical temperature gradient length for the onset of turbulent transport. Convective-like features appear close to the threshold (i.e., just outside the ITB foot) when the value of the threshold is sufficiently high, with a good match with the theoretical predictions for the trapped electron mode threshold. The appearance of a second maximum is due to the oscillation of the temperature profile across the threshold in the case of a weak ITB. Simulations with an empirical critical gradient length model and with the theory based GLF23 [R. E. Waltz , Phys. Plasmas, 4, 2482 (1997)] model are presented. The difference with respect to previous results of cold pulse propagation across JET ITBs is also discussed. (C) 2007 American Institute of Physics. (literal)
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