Previous scaling results indicate that the H-mode power threshold increases nearly linearly with the line-averaged density, , and the toroidal field, . The power threshold was measured in similar, ITER-like, discharges in JET and DIII-D, at the same and in order to determine the size scaling of the power threshold. The results indicate a size scaling proportional to the surface area, , which is weaker than the linear surface area dependence previously assumed.
Latest results on the H-mode threshold using the international H-mode threshold database