Modeling of Impurity Transport in High Density Plasma with Highly Enhanced Radiation Loss on JT-60U

Impurity transport has been modeled using a 1-D transport code for the main plasma and a 2-D fluid code (UEDGE) for the divertor and scrape-off layer plasmas in the JT-60U high βp mode plasma with highly enhanced radiation by injecting seed impurity argon. The density profile of the seed impurity argon estimated from the soft x-ray profile was more peaked by a factor of 2 than the electron density profile. On the other hand, the density measurement of the fully ionized intrinsic impurity carbon indicated a flat carbon density profile. The radiation profile evaluated from these impurity density profiles was more peaked than the measurement in the main plasma. The divertor radiation calculated by the UEDGE code with the boundary condition of the argon density consistent with the 1-D transport analysis was localized around the strike points compared with the measurement.