Transport in the ignited reduced cost ITER devices IAM (IntermediateAspect Ratio Machine) and LAM (Low Aspect Ratio Machine) is exploredby self-consistent simulations using a special version of the 1.5 dimensionalBALDUR predictive transport code and applying empirical transportcoefficients. The main objective of the study is to determine thethermal energy confinement time τE,r required for operation at the design parameters.It is found that the τE,r value of the inductive IAM (with a helium fraction of 9%) is 3.3 s with argon seeding compared with τE,p = 3.0 s predicted by global scalings. For operationat τE,r = τE,p the value of Q = Pfus/Pbmust be reduced from 10 to 6.1, where Pfus is the fusion power and Pb is the beam power. The necessaryradiative loss from closed flux surfaces is reached in the argon scenarioat high and low separatrix densities. The assumption of flat densityprofiles and high edge densities is supported by simulations usinga new scaling law for the anomalous inward drift velocity. A studyof the advanced tokamak scenario of IAM resulting in an estimate ofthe required energy confinement time is also carried out. Simulationof the inductive LAM argon scenario yields τE,r = 4.0 s compared with τE,p = 3.9 s predicted by global scalings. Here operationat τE,p demands a Q value of 8.7.
Simulations of KSTAR high performance steady state operation scenarios