Transport and plasma control in the TJ-II stellarator

This paper shows the effect of 3D geometry on transport and plasma control in the TJ-II stellarator. The fuelling and impurity transport are affected due to the enhancement of neoclassical (NC) transport and subsequent onset of a radial electric field. Turbulence affects not only plasma but also neutral density, with effects on the fuelling. SOL is shown to be affected by plasma edge turbulence. The properties of stability and MHD modes are also explored. The plasma flow is shown to be affected by 3/2 magnetic island. Promising experimental results show the possibility of controlling Alfven modes by ECRH, and magnetic configuration by rotational transform and magnetic well scans.