The characteristics of transport in electron internal transport barriers (ITB) and in the vicinity of a rational surface with a magnetic island were analyzed using trasient transport analysis and steady state transport analysis. An electron ITB appeared in the large helical device (LHD), when the heating power of the electron cyclotron heating exceeded a power threshold. It was shown by the transport analysis that both the standard electron thermal diffusivity and the incremental electron thermal diffusivity are reduced significantly in the ITB. The results show that the radial heat flux near the rational surface is focused at the X-point region, and that may be the mechanism to induce an ITB near a rational surface.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics