Transient heat transport studies using laser ablated impurity injection in JET (Articolo in rivista)

Type
Label
  • Transient heat transport studies using laser ablated impurity injection in JET (Articolo in rivista) (literal)
Anno
  • 1998-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0029-5515/38/9/310 (literal)
Alternative label
  • P. Galli (a), A. Cherubini (b), R. De Angelis (b), F. De Luca (a), M. Erba (c), R. Giannella (a), G. Gorini (a), A. Jacchia (d), H. Jäckel, P. Mantica (d), V.V. Parail, L. Porte and A. Taroni (1998)
    Transient heat transport studies using laser ablated impurity injection in JET
    in Nuclear fusion (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • P. Galli (a), A. Cherubini (b), R. De Angelis (b), F. De Luca (a), M. Erba (c), R. Giannella (a), G. Gorini (a), A. Jacchia (d), H. Jäckel, P. Mantica (d), V.V. Parail, L. Porte and A. Taroni (literal)
Pagina inizio
  • 1355 (literal)
Pagina fine
  • 1371 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://iopscience.iop.org/0029-5515/38/9/310/ (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 38 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom (a) INFM and Physics Department, University of Milan, Milan, Italy (b) CRE Frascati, Euratom-ENEA-CNR Association, Frascati, Rome, Italy (c) Euratom-CEA Association, C.E. Cadarache, Saint-Paul-lez-Durance, France (d) Istituto di Fisica del Plasma, Euratom-ENEA-CNR Association, Milan, Italy NOTA: affiliazioni non chiaramente indicate sull'articolo (literal)
Titolo
  • Transient heat transport studies using laser ablated impurity injection in JET (literal)
Abstract
  • Following impurity injection by laser ablation (LA) in JET plasmas, the electron temperature, T-e, is observed to drop at a rate that cannot be accounted for by changes in radiated power, Delta P-rad. T-e starts to drop promptly over a large fraction of the plasma volume, which can be explained by a non-local change in electron heat diffusivity. The change in diffusivity, Delta chi(e), is generally short lived, lasting a few milliseconds, even if Delta P(ra)d can persist for longer times. No clear relation between Delta P-rad and the strength of the prompt plasma response to LA can be observed, but only those events with Delta P-rad/P-rad > 0.5 give rise to detectable T-e perturbations. In hot ion H mode plasmas, Delta chi(e) is found to be spatially non-uniform and increasing exponentially with the time delay of the LA relative to the onset of the H mode. Examples of non-monotonic Delta chi(e) profiles are found in plasmas of lower heating power. Energy transport models combining local and non-local (or strongly non-linear) features are possible candidates for an explanation of these observations. (literal)
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