Transport simulations of H-mode plasmas with ITER database

Abstract

Transport simulations have been carried out for L- and H-mode plasmas in DIII-D and JET installed in the ITER database with four transport models, i.e. the current diffusive ballooning mode (CDBM) model, the mixed shear model and drift-wave turbulences called IFS/PPPL and multi-mode models. In the CDBM and the mixed shear models, simulation results show very similar characteristics in L- and H-mode plasmas on DIII-D and JET, although the adjustment of the diffusion coefficient might be necessary for both models. In comparison with L-mode plasmas, the H-mode plasmas should be simulated with a reduction of the transport coefficient by a factor of for electrons and for ions. In addition, a systematic difference is observed in the confinement performance between DIII-D and JET. Compared with the transport coefficient in JET, that in DIII-D should be reduced by a factor of for electrons and for ions. In the IFS/PPPL model with no shear stabilization, systematic differences are not observed in L-/H-modes and DIII-D/JET plasmas. The ion temperature profile seems to be very stiff to the critical ion temperature gradient, especially in H-mode plasmas in comparison with L-mode ones. By changing the density profile slightly and the edge pedestal temperature, the sensitivity of the ion temperature profile is examined. The ion temperature is, however, not so sensitive to these parameters. When the density profile is changed by a factor of with the form of , the change of stored energy is around -5-13%. In the multi-mode model, the agreement between experimental data and simulation results seems to be better, compared with other models.