Parametric study of NTM in ITER inductive scenario

with Q = 10 for about 400 s). Analysis was based on the modified Rutherford equation 1 (MRE) for the evolution of the magnetic island width. In the model we kept standard tearing mode stability parameter Δ′, neoclassical drive of the mode, magnetic curvature effect and ECCD stabilization. Polarization current effect and mode coupling were neglected. There are lot of NTM models similar to ours which were used for interpretation of the experimental data from various tokamaks. However, careful examination shows that all of them: 1) contain series of coefficients to fit modeling result to experimental data, 2) use different expressions for particular contributions to MRE, 3) employ different models for the small island limit and NTM onset threshold. One of the principal goal of this study is to add the NTM model based on MRE maximum predictive ability for estimations of NTM influence on the discharge characteristics and specify requirements for their control in ITER. For these we reformulate MRE on the base of the standard set of assumptions but removing unnecessary oversimplifications, reorganize its structure to allow for particular contributions from plasma electrons and ions, and parameterize EC driven current characteristics obtained with use of the OGRAY code for realistic design of the EC launchers and plasma characteristics of ITER inductive reference scenario. 2. Model In our model we use standard assumptions on the equilibrium and perturbation magnetic fields in the vicinity of the resonance surface s