title: Probing internal transport barriers with heat pulses in JET.
abstract: The first electron temperature modulation experiments in plasmas characterized by strong and long-lasting electron and ion internal transport barriers (ITB) have been performed in JET using ion cyclotron resonance heating in mode conversion scheme. The ITB is shown to be a well localized narrow layer with low heat diffusivity, characterized by subcritical transport and loss of stiffness. In addition, results from cold pulse propagation experiments suggest a second order transition process for ITB formation.
authors.affiliation: Istituto di Fisica del Plasma P.Caldirola, Associazione Euratom-ENEA-CNR, Milano, Italy.
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authors.lastname: Mantica
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authors.lastname: Van Eester
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authors.lastname: Garbet
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authors.lastname: Imbeaux
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authors.lastname: Mantsinen
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authors.lastname: Moreau
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authors.lastname: Joffrin
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authors.lastname: Kiptily
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authors.lastname: Pinches
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authors.lastname: Sharapov
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authors.lastname: Thyagaraja
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authors.lastname: Voitsekhovitch
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authors.lastname: de Vries
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authors.lastname: Zastrow