Advanced tokamak research with integrated modeling in JT-60U

JT-60Uにおける統合モデリングによる先進トカマク研究

林 伸彦; JT-60チーム

Hayashi, Nobuhiko; JT-60 Team

Researches on advanced tokamak (AT) have been progressed in JT-60U with integrated modeling. Based on JT-60U experimental analyses and first principle simulations, new models were developed and integrated into core, rotation, edge/pedestal and scrape-off-layer (SOL)/divertor. The integrated models clarified complex and autonomous features in AT. Integrated core model was developed to take account of an anomalous radial transport of alpha particles caused by Alfven eigen modes. It showed the reduction of fusion gain by the anomalous radial transport. Integrated rotation model showed mechanisms of rotation driven by the fast ion ripple loss and the charge separation, and the linkage of rotations and the radial electric field in the formation of an internal transport barrier. An inward pinch model of high-Z impurity due to the atomic process was developed and indicated the pinch velocity increases with the toroidal rotation. Integrated edge/pedestal model clarified the cause of collisionality dependence of energy loss due to the edge-localized mode and the enhancement of energy loss by steeping a core pressure gradient beyond the pedestal top. A model of SOL flow driven by core particle orbits was developed by introducing the ion-orbit-induced flow to fluid equations. Integrated SOL/divertor model clarified a mechanism of enhanced radiation near the X-point multifaceted asymmetric radiation.