Ion Temperature Profiles along a Hydrogen Diagnostic Beam
in a TORE SUPRA Tokamak Plasma

A. N. Romannikov*, Yu. V. Petrov**, P. Platz***, W. R. Hess***, T. Hutter***,
J. L. Farjon***, and P. Moreau***

*Troitsk Institute for Innovation and Fusion Research, Troitsk, Moscow oblast, 142092 Russia

**Prairie View A&M University, Prairie View, TX 77446, USA

***Association Euratom-CEA sur la Fusion, Cadarache 13108, St. Paul Lez Durance, France

Received June 25, 2001; in final form, August 28, 2001

Abstract—The active particle diagnostic technique is used to study the ion temperature at five spatial points
along the path of a hydrogen diagnostic beam. The temperature of the main ion plasma component (deuterium
ions) measured by this diagnostic technique along the beam path is compared with the temperature of carbon
ions (C⁺⁵). A study is made of the following characteristic features of the behavior of the ion temperature pro-
files T_i in various TORE SUPRA operating modes: the formation of flat and even hollow T_i profiles in ohmic
discharges with q ~ 3 at the plasma edge, the change in T_i profiles in ergodic divertor discharges, and the dif-
ference between the temperature of the bulk ions measured by the active particle diagnostic technique and the
temperature of C⁺⁵ ions in the plasma region r/a > 0.5. The features revealed are explained at a qualitative level.
© 2002 MAIK “Nauka/Interperiodica”.

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