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Probing internal transport barriers with heat pulses in JET |
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| Authors: | Mantica P Van Eester D Garbet X Imbeaux F Laborde L Mantsinen M Marinoni A Mazon D Moreau D Hawkes N Joffrin E Kiptily V Pinches S Salmi A Sharapov S Thyagaraja A Voitsekhovitch I de Vries P Zastrow K-D |
| Institution: | Istituto di Fisica del Plasma P.Caldirola, Associazione Euratom-ENEA-CNR, Milano, Italy. |
| 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. |
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