Fully Ionized and Total Silicon Abundances in the Alcator-C Tokamak

With use of x-ray imaging arrays, spatially and temporally resolved measurements were made of fully ionized and total absolute Si ($Z=14\mathrm{}$) densities following injection of Si into Alcator C. The fully stripped ions were detected through x rays resulting from ground-state radiative recombination. Central ion densities were found to be close to coronal equilibrium values. In addition, radial profiles of fully ionized and H-like Si showed large fluctuations during internal disruptions.