We have injected short bursts of aluminum into the adiabatic-toroidal-compressor (ATC) tokamak, and measured the time evolution of the radial distribution of highly ionized states of aluminum. The results are compared with a computer code describing neoclassical impurity diffusion.

• Received 14 July 1975

DOI:https://doi.org/10.1103/PhysRevLett.35.1507