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Investigations of heat- and particle-deposition distributions on helical divertor plates were performed both experimentally and numerically with the Large Helical Device (LHD). The distributions were measured by ther- mocouples and Langmuir probe arrays embedded in the divertor plates. They are similar to the distribution of field lines with long connection lengths, which are estimated numerically by field-line tracing calculations. Lo- calized heat- and particle-deposition distributions were observed, and were found to be determined primarily by the magnetic-field line structure in the divertor region. Theyvary depending on the configuration—theintensively loaded areas move with a change of the magnetic configuration. Using this property, a swing of the magnetic axis successfully dispersed the heat and particle loads on the divertor plate during long-pulse discharges. The magnetic-axis swing around a certain magnetic-axis position is found to be very effective in changing the field- line distribution pattern drastically, and thus dispersing the heat load.

Heat- and Particle-Deposition Distribution on Helical Divertor Plates in LHD During Real-Time Magnetic-Axis Swing Operations