The heat balance equation is derived and solved for fusion edge plasma conditions with ͑partially developed͒ ergodic magnetic-field structures. For this purpose, a three-dimensional ͑3D͒ Monte Carlo code, "E3D," based upon the "multiple local magnetic coordinate system approach" has been developed. Parameters typical for the Dynamic Ergodic Divertor ͑DED͒ of TEXTOR-94 ͑Torus Experiment for the Technology Oriented Research͒ ͓K. H. Finken et al., Fusion Eng. Des. 37, 1 ͑1997͔͒ are chosen in the

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... plications. The plasma temperature fields and the profiles of the radial component of heat flux due to the classical parallel and anomalous perpendicular diffusion are calculated. Because of magnetic-field ergodization and diversion of field lines, parallel conduction also can contribute to this radial flux. The results are compared with theoretical predictions for two limiting cases: With the Rechester-Rosenbluth model of ergodization-induced transport and with a "laminar flow model" proposed in the present paper. This latter model describes the effects of field line diversion. The diversion effect is shown to be dominant for TEXTOR-DED conditions.