Integrated Modeling of Tokamak Plasmas

Significant particle losses noted in the last two posts are studied by analyzing the diffusivity profiles.

The particle diffusivity remains too high after 13999 time steps, which correspond to approximately 28 toroidal ion transit times (13999×0.002). Thermal diffusivity remains very high as well. However, the ion and electron temperatures continue to rise with very high auxiliary heating power.

Smoothing of thermal diffusivity profiles (fm_nsmooth_chi=2) improves numerical stability.

The flow shear factor is zero in the plasma core. Also, the flow shear factor remains relatively noisy.