@prefix prodottidellaricerca: . @prefix istituto: . @prefix prodotto: . istituto:CDS033 prodottidellaricerca:prodotto prodotto:ID236248 . @prefix pubblicazioni: . @prefix unitaDiPersonaleInterno: . unitaDiPersonaleInterno:MATRICOLA10033 pubblicazioni:autoreCNRDi prodotto:ID236248 . @prefix rdf: . @prefix retescientifica: . prodotto:ID236248 rdf:type retescientifica:ProdottoDellaRicerca , prodotto:TIPO1101 . @prefix rdfs: . prodotto:ID236248 rdfs:label "Propagation of cold pulses and heat pulses in ASDEX Upgrade (Articolo in rivista)"@en . @prefix xsd: . prodotto:ID236248 pubblicazioni:anno "2000-01-01T00:00:00+01:00"^^xsd:gYear ; pubblicazioni:doi "10.1088/0029-5515/40/11/311"^^xsd:string . @prefix skos: . prodotto:ID236248 skos:altLabel "
F. Ryter (a), R. Neu (a), R. Dux (a), H.-U. Fahrbach (a), F. Leuterer (a), G. Pereverzev (a), J. Schweinzer (a), J. Stober (a), W. Suttrop (a), ASDEX Upgrade Team (a), F. De Luca (b), A. Jacchia (c) and J.E. Kinsey (d) (2000)
Propagation of cold pulses and heat pulses in ASDEX Upgrade
in Nuclear fusion (Online)
"^^rdf:HTML ; pubblicazioni:autori "F. Ryter (a), R. Neu (a), R. Dux (a), H.-U. Fahrbach (a), F. Leuterer (a), G. Pereverzev (a), J. Schweinzer (a), J. Stober (a), W. Suttrop (a), ASDEX Upgrade Team (a), F. De Luca (b), A. Jacchia (c) and J.E. Kinsey (d)"^^xsd:string ; pubblicazioni:paginaInizio "1917"^^xsd:string ; pubblicazioni:paginaFine "1932"^^xsd:string ; pubblicazioni:url "http://iopscience.iop.org/0029-5515/40/11/311/"^^xsd:string ; pubblicazioni:numeroVolume "40"^^xsd:string . @prefix ns10: . prodotto:ID236248 pubblicazioni:rivista ns10:ID262046 ; skos:note "ISI Web of Science (WOS)"^^xsd:string ; pubblicazioni:affiliazioni "(a) Max-Planck-Institut f\u00FCr Plasmaphysik, Euratom Association, Garching, Germany \n(b) INFM and Dipartimento di Fisica, Universit\u00E0 degli Studi di Milano, Milan, Italy \n(c) Istituto di Fisica del Plasma, Associazione Euratom-ENEA-CNR, Milan, Italy \n(d) General Atomics, San Diego, California, United States of America"^^xsd:string ; pubblicazioni:titolo "Propagation of cold pulses and heat pulses in ASDEX Upgrade"^^xsd:string ; prodottidellaricerca:abstract "Experiments on electron heat transport were performed in the tokamak ASDEX Upgrade, mainly in ohmically heated plasmas, applying either edge cooling with laser blow-off impurity injection or edge heat pulses with ECRH. Repetitive pulses within one plasma discharge were made allowing Fourier transformation of the temperature perturbation, yielding a good signal to noise ratio up to high harmonics and a detailed investigation of the pulse propagation. For densities lower than 1.8 x 10(19) m(-3), an increase of central electron temperature was found as the response to edge cooling via impurity injection similar to observations made in the TEXT, TFTR, RTP and Tore Supra tokamaks. The inversion does not appear instantaneously, but with a time delay roughly compatible with diffusion. Modelling of the propagation of the cold pulses in the framework of the IFS-PPPL model yields qualitative agreement. However, the predicted increase of ion temperature is not observed experimentally on a fast timescale. The response to ECRH heat pulses is not perfectly symmetrical to cold pulse experiments, but the similarities suggest a common underlying physical mechanism. No inversion of the heat pulse is found, instead the initial pulse from the edge is associated with a second, much slower, heat pulse in the centre. This central reaction is in fact quite similar (and not symmetrical) to that of the cold pulses. By varying the position of the ECRH deposition it could be shown that the central increase is related to the arrival of the pulse close to the inversion radius and not to the initial pulse. Modelling was performed to investigate the possible physics mechanisms and for comparison with the cold pulses."@en ; prodottidellaricerca:prodottoDi istituto:CDS033 ; pubblicazioni:autoreCNR unitaDiPersonaleInterno:MATRICOLA10033 . ns10:ID262046 pubblicazioni:rivistaDi prodotto:ID236248 .