The Influence of the radial particle transport on the divertor plasma detachment

Hoshino, Kazuo; Shimizu, Katsuhiro; Takizuka, Tomonori*; Asakura, Nobuyuki; Nakano, Tomohide

The divertor plasma detachment is the most promising candidate to reduce the divertor heat load in fusion reactors, while the present understanding is not enough to explain the experimental observations. To understand the detachment physics and improve the divertor modeling, an integrated divertor code SONIC has been applied to modelling of the JT-60U detached divertor plasma. In the comparison between the SONIC results and the JT-60U experimental data, the density at the private flux region was higher than the experimental data near the X-point. To investigate the influence of the particle transport in the private region, the particle diffusion coefficient in the private region was increased. The detachment, i.e., the rollover of the ion flux to the divertor target, was observed while influence of the enhancement of on the mid-plane density and its profile were not seen. It is found that the transport in the private region plays an important role for the formation of the divertor detachment.