Inverse methods and tomography

Because of the use of remote-sensing and non-local diagnostic systems, the group has an ongoing interest in the application of advanced signal processing techniques and inverse methods including tomography, and various nonlinear iterative and Bayesian techniques. The problems we consider include Doppler tomography, plasma current tomography and plasma equilibrium reconstruction.

The development of coherence imaging systems followed from theoretical investigations of the Doppler tomography problem where it was been shown that images of the complex optical coherence have the nice property that the fringe phase and visibility projections relate in a simply invertible way to fundamental plasma properties.

Tomographic reconstructions of the emissivity and parallel flow speed at times (L-R) 500ms, 2000ms and 4000ms during a high-power discharge in the DIII-D tokamak. The equilibrium flux surfaces are over-plotted for reference

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