Numerical analysis of error fields due to port holes in a plasma confinement device

Eddy currents induced in vacuum and structural components of plasma confinement devices generate irregular magnetic fields. One of the most serious problems for plasma confinement in reversed-field-pinch (RFP) is such error fields. In this paper, error fields produced by currents in a vacuum vessel with port holes are calculated using an eddy current analysis code for a three-dimensional thin shell structure, INCANET, and the effect of bridging the port holes with conductive plates to reduce the error fields is estimated. These numerical analyses have been done for the REPUTE-1 REP. (author)