Image reconstructions of ECE and x-ray signals for high β plasmas on TFTR

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Abstract
Reconstruction techniques have been developed to obtain 2‐D images of high β plasmas by taking advantage of the large toroidal rotation rate on TFTR. The Shafranov shift, which is large in high β plasmas, is taken into account in the reconstructions. A 2‐D image of the electron temperature is reconstructed from the electron cyclotron emission with the assumption of rigid poloidal rotation. The soft x‐ray tomography is performed using the Fourier–Bessel expansion technique from two x‐ray cameras. The reconstruction techniques are tested numerically through the use of model islands. The image is reproduced from the source function with these techniques; however, the x‐ray tomography without rotation using the two cameras gives unacceptable results.