The influence of limiter biasing on plasma confinement, turbulence and plasma flows is
investigated in the TJ-II stellarator. Experimental results show that it is possible to modify
global confinement and edge plasma parameters with both positive and negative biasing.
Significant and minor modifications in the structure of plasma fluctuations have been
observed during the transition to improved confinement regimes induced by limiter biasing.
These results show evidence of electric field induced improved confinement via multiple …

The influence of limiter biasing on plasma confinement and turbulence has been
investigated in the TJ-II stellarator. The ratio between plasma density and particle recycling,
increases by up to a factor of two during limiter biasing without a significant influx of
impurities. During the improved confinement regimes a bursty behaviour ois observed in H
{sub {alpha}}. These edge instabilities have a direct impact on particle confinement. During
the transition to improved confinement regimes induced by limiter biasing different …