Observation of the two-dimensional structure of a stationary and transient double layer in current-carrying magnetized plasma

Observation is made of the two-dimensional structure of a stationary and transient double layer which was formed by a locally applied additional discharge in a magnetized plasma. The two-dimensional double layer is V-shaped. A very large negative potential dip of approximately 16 V [≂(3–5)Te/e] on the low potential tail of the layer is transiently created. The formation process of the layer and the dependence of the dip depth on the limiting current passing through the plasma are also discussed. The observed steady state is confirmed by an analysis.