This figure shows the ITER plasma surface and toroidal magnetic field coils; color contours indicate local magnetic strength. The wavy structure of the contour lines is caused by deviations from axisymmetry due to the finite number of toroidal field coils and the presence of ferritic materials in three test blanket modules, which are located on one side of the torus. Data for this plot was provided by ORNL’s VMEC 3D equilibrium code using profiles for an ITER Scenario 4 plasma.
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/oakridgelab/4071616631/">ITER 3D plasma equilibrium with ripple contours</a>