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Perturbative transport experiments in JET low or reverse magnetic shear plasmas (Articolo in rivista)

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Perturbative transport experiments in JET low or reverse magnetic shear plasmas (Articolo in rivista) (literal)

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Mantica P. (1), Gorini G. (2), Imbeaux F. (3), Kinsey J. (4), Sarazin Y. (3), Budny R. (5), Coffey I. (6), Dux R. (7), Garbet X. (3), Garzotti L. (8), Ingesson C. (9), Kissick M. (10), Parail V. (6), Sozzi C. (1), Walden A. (6) and contributors to the EFDA-JET Workprogramme (2002)
Perturbative transport experiments in JET low or reverse magnetic shear plasmas
in Plasma physics and controlled fusion (Print)
(literal)

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Mantica P. (1), Gorini G. (2), Imbeaux F. (3), Kinsey J. (4), Sarazin Y. (3), Budny R. (5), Coffey I. (6), Dux R. (7), Garbet X. (3), Garzotti L. (8), Ingesson C. (9), Kissick M. (10), Parail V. (6), Sozzi C. (1), Walden A. (6) and contributors to the EFDA-JET Workprogramme (literal)

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Pubblicazione su rivista scientifica internazionale a larga diffusione con Impact Factor nel 2002 pari a 2.121 (literal)

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Studio della propagazione di impulsi di calore sul tokamak JET con configurazione a shear rovesciato (literal)

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(1) IFP CNR, Milano Italy; (2) INFM, Department of Physics, UNIMIBI, Milano, Italy; (3) Euratom-CEA Assoc., Cadarache, France; (4) Lehigh University, Bethlehem, Pennsylvania, USA; (5) PPPL, PO Box 451, Princeton, New Jersey, USA; (6) Euratom/UKAEA Assoc., Abingdon, Oxon, UK ; (7) MPI, EURATOM Association, Garching, Germany; (8) EURATOM-ENEA-CNR Association, Padova, Italy; (9) FOM, Euratom-FOM Assoc., Nieuwegein, The Netherlands; (10) Dep. Physics Astronomy, Univ. California, Los Angeles, CA, USA (literal)

Titolo

Perturbative transport experiments in JET low or reverse magnetic shear plasmas (literal)

Abstract

Perturbative transport experiments have been performed in JET low or reverse magnetic shear plasmas either in conditions of fully developed internal transport barrier (ITB) or during a phase where an ITB was not observed. Transient peripheral cooling was induced either by laser ablation or by shallow pellet injection, and the ensuing travelling cold pulse was used to probe the plasma transport in the electron and, for the first time, also in the ion channel. Cold pulses travelling through ITBs are observed to erode the ITB outer part, but, if the inner ITB portion survives, it strongly damps the propagating wave. The result is discussed in the context of proposed possible pictures for ITB formation. In the absence of an ITB, the cold pulse shows a fast propagation in the outer plasma half, which is consistent with a region of stiff transport, while in the inner half it slows down but shows the peculiar feature of amplitude growing while propagating. The data are powerful tests for the validation of theoretical transport models. (literal)

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