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Abstract

Particle transport is an important issue in magnetically confined fusion plasmas. Recently a significant peaking of the density profile has been observed on the Tore Supra tokamak in long discharges (> ) power modulation experiments, using both electron cyclotron resonance heating (ECRH) and ion cyclotron resonance heating (ICRH), have been performed in the Tore Supra tokamak. A strong and synchronous coupling has been observed between the density and temperature modulations. The aim of this work is to determine the driving source for this density modulation, and in particular the role played by the anomalous pinch.??4 mn) with fully non-inductive lower hybrid current drive.
In this regime the loop voltage remains zero over a time much longer than the current diffusion time, i.e. the toroidal electric field vanishes over the whole plasma volume, as well as the neoclassical Ware pinch. This suggests the existence of an anomalous particle pinch in the plasma. The anomalous pinch velocity is predicted by turbulent transport theories. For example, a 3D fluid model of ITG/TEM turbulence shows that there are two types of particle pinch: the curvature driven pinch, which depends essentially on the magnetic shear and the plasma geometry, and the themodiffusion, which depends on the temperature profile and on its gradient.
Power modulations are a powerful tool often used to investigate heat transport processes in tokamaks [3]. In some situations, this could also be an interesting method for the investigation of the particle transport due to the anomalous pinch. Low frequency (Hz 1)

Additional information

Authors: ZOU X L, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);GIRUZZI G, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);ARTAUD J F, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);BOUQUEY F, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);CLARY J, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);DARBOS C, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);EURY S P, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);LENNHOLM M, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);MAGNE R, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);BRÉMOND S, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);SÉGUI J L, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An oral paper given at: 31st EPS Conference on Controlled Fusion and Plasma Physics Organised by: CCLRC Rutherford Appleton Laboratory (GB); EURATOM/UKAEA Fusion Association (GB) Held at: Imperial College London (GB)
Availability: Available from Association EURATOM-CEA, Département de Recherches sur la Fusion Contrôlée, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: dirdrfc@drfc.cad.cea.fr
Record Number: 200517983 / Last updated on: 2005-03-10
Category: PUBLICATION
Original language: en
Available languages: en