Full toroidal imaging of non-axisymmetric plasma material interaction in the National Spherical Torus Experiment divertor

Rev Sci Instrum. 2012 Oct;83(10):10E532. doi: 10.1063/1.4739510.

Abstract

A pair of two dimensional fast cameras with a wide angle view (allowing a full radial and toroidal coverage of the lower divertor) was installed in the National Spherical Torus Experiment in order to monitor non-axisymmetric effects. A custom polar remapping procedure and an absolute photometric calibration enabled the easier visualization and quantitative analysis of non-axisymmetric plasma material interaction (e.g., strike point splitting due to application of 3D fields and effects of toroidally asymmetric plasma facing components).