[Table of Contents]

Plasma and Fusion Research

Volume 2, S1023 (2007)

Regular Articles

Fast Ion Dynamics in Magnetically Confined Plasma Measured by Collective Thomson Scattering
Henrik BINDSLEV1), Stefan K. NIELSEN1), Søren B. KORSHOLM1,2), Fernando MEO1), Poul K. MICHELSEN1), Susanne MICHELSEN1), Erekle L. TSAKADZE1), Paul WOSKOV2), Egbert WESTERHOF3), J. A. HOEKZEMA4), J. W. OOSTERBEEK4), Laurie PORTE5) and the TEXTOR team
1)
EURATOM-Risø National Laboratory, DK-4000 Roskilde, Denmark
2)
MIT Plasma Science and Fusion Center, Cambridge, MA 02139,USA
3)
FOM-Institute for Plasma Physics Rijnhuizen, EURATOM-FOM, The Netherlands
4)
EURATOM-Forschungszentrum Jülich GmbH, Institut für Plasmaphysik, D-52425 Jülich, Germany
5)
CRPP, EURATOM-Confédération Suisse, EPFL, CH-1015 Lausanne, Switzerland
(Received 3 December 2006 / Accepted 5 June 2007 / Published 20 November 2007)

Abstract

Magnetically confined fusion plasmas are mostly heated by small populations of energetic ions. In current devices these fast ions are mainly generated by auxiliary heating, while in ITER fusion generated alpha particles will dominate. A multitude of MHD phenomena, some of them driven by the fast ions, can redistribute or eject the energetic ions prematurely, affecting fusion performance and potentially damaging walls. Theory and modeling of fast ion dynamics in fluctuating or turbulent plasmas is challenging and needs guidance from - and bench marking against - measurements of the fast ion dynamics. Collective Thomson Scattering (CTS) can provide such measurements of the confined fast ions. Here we present CTS measurements of the TEXTOR tokamak plasma which show fast ions responding to sawteeth and display slowdown evolution of the fast ion velocity distribution after switch off of neutral beam heating. The toroidal rotation velocity of the bulk ions is inferred from the measurements. Plans for an ITER fast ion CTS are also briefly discussed.

Keywords

plasma and fusion research, fast and energetic ion diagnostic, collective Thomson scattering, slowdown, rotation velocity

DOI: 10.1585/pfr.2.S1023

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This paper may be cited as follows:

Henrik BINDSLEV, Stefan K. NIELSEN, Søren B. KORSHOLM, Fernando MEO, Poul K. MICHELSEN, Susanne MICHELSEN, Erekle L. TSAKADZE, Paul WOSKOV, Egbert WESTERHOF, J. A. HOEKZEMA, J. W. OOSTERBEEK, Laurie PORTE and the TEXTOR team, Plasma Fusion Res. 2, S1023 (2007).