Vacuum Vessel Eddy Current Modeling for Tokamak Fusion Test Reactor Adiabatic Compression Experiments

A relatively simple current filament model of the Tokamak Fusion Test Reactor (TFTR) vacuum vessel is described. It is used to estimate the three-dimensional structure of magnetic field perturbations in the vicinity of the plasma that arise from vacuum vessel eddy currents induced during adiabatic compression. Eddy currents are calculated self-consistently with the plasma motion. The Shafranov formula and adiabatic scaling laws are used to model the plasma. Although the specific application is to TFTR, the present model is of general applicability.