Berlin 2001 – scientific programme

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P: Plasmaphysik

P 1: Magnetic Confinement and Plasma Wall Interaction

P 1.5: Talk

Monday, April 2, 2001, 17:40–17:55, 2053

A method for absolute measurements of the toroidal plasma speed in tokamak devices — •Imtiaz Ahmad¹, Günter Bertschinger², Manfred Bitter³, and Hans-Joachim Kunze¹ — ¹Institut für Experimentalphysik V, Ruhr-Universität Bochum, D-44780 Bochum, Germany — ²Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, Ass. Euratom-KFA, D-52425 Jülich, Germany, Trilateral Euregio Cluster — ³Princeton Plasma Physics Laboratory, Princeton University, James Forrestal Campus, Princeton, New Jersey 08543, USA

A method has been developed for the absolute measurements of the toroidal plasma speed in tokamak like devices. The method is essentially based on the Doppler shift of two spectral lines (at wavelengths λ_w = 3.9494Å and λ_z = 3.9944Å from the He-like argon impurity species) and on the fact that different Bragg angles of lines in the x-ray region lead to different shifts in the detector plane. This results in an expansion or a compression of the separation of the two lines depending upon the direction and magnitude of the plasma rotation speed. The contraction/dilation of the spectral lines therefore gives magnitude and direction of plasma rotation speed. Respective tests and measurements have been carried out on TEXTOR-94.