Analysis of JT-60SA Scenarios on the Basis of JET and JT-60U Discharges
Validation of the main models available for the plasma simulation is mandatory. These include, e.g., energy and particle transport, current, rotation and their sources, pedestal pressure and fast particles. JT-60SA is a machine designed on the basis of the results of JT-60U, and using an upgrade of the JT-60U Neutral Beam Injection (NBI) system; on the other hand, it has practically the same size as JET, which also has NBI as the main heating and current drive system. Therefore, it appears that simulations of JT-60SA scenarios should be based at least on experimental results of the two machines that are the most similar, for size and configuration: JT-60U and JET. For this purpose, in the framework of a broad research plan based on JT-60SA, a series of representative discharges of the three main operational scenarios, H-mode, hybrid and steady-state, have been selected for each device. A subset of these discharges, inductive H-modes and hybrids are discussed in this paper. The selected time for the analysis concentrates on the phase of highest performance of each of these discharges. Predictive simulations for the temperature profiles have been carried out with three transport models, Bohm-GyroBohm, CDBM and GLF23, and by adjusting, as a first step, the pedestal, rotation and density to experimental values whenever available. To carry out this programme, the integrated modelling codes CRONOS and TOPICS have been used in order to benchmark the models in both codes. Later, predictive particle transport simulations have been performed with GLF23. Finally, fully predictive simulations of temperatures, density and pedestal have been performed. The pedestal temperature is calculated by using the so-called Cordey two-term scaling . With this approach, calculations for JT-60SA have been carried out.