Analysis of RF sheath interactions in TFTR

摘要

New theoretical and experimental tools are applied to the analysis of ICRF antenna- edge plasma interactions in the TFTR tokamak. A new numerical method for computing the three dimensional(3-D)rf sheath voltage distribution is used, and the quantitative predictions of rf sheath theory are compared with measurements of the edge density profile obtained by microwave reflecto- metry and with titanium impurity concentration data. It is shown that the local density depletion at the antenna is consistent with density pump-out by strong E×B convection into the Faraday screen (FS).