JT-60SA design scenarios have been analyzed with the help of the self-consistent core-edge COREDIV code, with the aim to assess the influence of impurities on the plasma parameters and tokamak performance. In particular, the reduction of divertor target power load due to radiation of sputtered and externally seeded impurities has been investigated. For all scenarios considered, the gradual replacement of carbon by low Z seeding impurity (N, Ne) is observed as the gas influx increases. For high auxiliary power and low density scenarios, the carbon and seeding impurity radiation does not effectively reduce power to plate. Consequently, results with very high (about 6–8) and impurity concentrations (>9%) are observed. For these scenarios, seeding of the high Z impurity like krypton seems to be more appropriate, in particular when the plasma density is increased.
Steady-state sustainment of divertor detachment with multi-species impurity seeding in LHD