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Abstract

The Tokamak à Configuration Variable (TCV) offers an outstanding variability of the plasma shape. Using X-ray tomography, the shape of the inner flux surfaces of a poloidal cross section of the plasma can be reconstructed, including fast variations due to magnetohydrodynamic (MHD) activity. The hardware as well as the software of the 200 channel system developed for the TCV is described. A new, dynamical calibration is used which enables an enhanced quality of the reconstructed images to be observed. The tomographic inversion is performed using a variety of methods, and the merits of the different algorithms which have been implemented at MATLAB functions are compared. The tomographic inversion results are analysed with the help of the biorthogonal decomposition, allowing, for example, identification of MHD modes without using any a priori information on the poloidal mode structure. Recent results on the dependence of sawtooth activity on the plasma triangularity are presented to demonstrate the performance of the soft X-ray tomography system.

Additional information

Authors: ANTON M ET AL, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas, Association EURATOM (CH)
Bibliographic Reference: Article: Plasma Phys, and Contr. Fusion (1996), pp. 1-68
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