Reduced drift kinetic neoclassical tearing mode (RDK-NTM) solver and drift kinetic neoclassical tearing mode (DK-NTM) solver benchmarking

A 4D drift kinetic non-linear code, DK-NTM, has been developed to describe the plasma response to the neoclassical tearing mode (NTM) magnetic perturbation. Employing the drift island formalism allows the dimensionality reduction from 4D to 3D (the RDK-NTM approach). This simplifies the numerical task and efficiently resolves the collisional boundary layer across the trapped-passing boundary. The benchmarking DK- and RDK-NTM data is presented.