SAWTEETH-INDUCED IMPURITY TRANSPORT IN TOKAMAK PLASMAS

A consistent picture of sawteeth-induced impurity transport is present ed based on a recently given model for plasma redistribution by sawtoo th crashes. The redistribution model is based on ideal magnetohydrodyn amic conservation laws and assumes that the magnetic flux and the volu me of the layers that reconnect during the crash are conserved. The po st-crash redistributed impurity density is found in terms of the impur ity density before the crash and the profiles of the safety factor bef ore and after the crash. Comparisons with experimental results show go od qualitative agreement. (C) 1996 American Institute of Physics.