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APS » Journals » Phys. Rev. Lett. » Volume 96 » Issue 9
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Phys. Rev. Lett. 96, 095002 (2006) [4 pages]

Probing Internal Transport Barriers with Heat Pulses in JET

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P. Mantica1, D. Van Eester2, X. Garbet3, F. Imbeaux4, L. Laborde3, M. Mantsinen4, A. Marinoni5,*, D. Mazon3, D. Moreau3, N. Hawkes6, E. Joffrin3, V. Kiptily6, S. Pinches7, A. Salmi4, S. Sharapov6, A. Thyagaraja6, I. Voitsekhovitch6, P. de Vries6, and K.-D. Zastrow6
1Istituto di Fisica del Plasma ’P.Caldirola,’ Associazione Euratom-ENEA-CNR, Milano, Italy
2LPP-ERM/KMS, Association Euratom-Belgian State, TEC, B-1000 Brussels, Belgium
3CEA Cadarache, Association Euratom-CEA, St Paul-lez-Durance Cedex, France
4Helsinki University of Technology, Association Euratom-Tekes, P.O.Box 2200, Finland
5Dipartimento di Ingegneria Nucleare, Politecnico di Milano, Milano, Italy
6Culham Science Centre, EURATOM/UKAEA Fusion Association, Oxon. OX14 3DB, United Kingdom
7Max-Planck-Institut für Plasmaphysik, EURATOM Association, Garching, Germany

Received 10 May 2005; published 7 March 2006

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.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.095002
DOI:
10.1103/PhysRevLett.96.095002
PACS:
52.25.Fi, 52.35.Ra, 52.55.Fa

*Present address: EPFL, CRPP-Euratom Association, CH 1015, Lausanne, Switzerland

 
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