Dynamical Response of Turbulent Structures in Cylindrical Magnetized Plasmas

Abstract

Dynamical response of the streamer near a critical condition where the streamer disappears is investigated by using a three dimensional fluid simulation. The gradual change of the global control parameter is given to the plasma. When the control parameter approaches the critical condition, the phase mismatch between the drift waves (which form the streamer) and the mediator mode increases abruptly, finally loosing the nonlinear matching condition. The eigenmode is also modified after the transition from streamer to the other state occurs. The phase relation is much sensitive compared to the change of amplitude, and could be observed even by a one-point measurement.

End plate biasing experiments in linear magnetized plasmas

“…The streamer is considered to enhance radial heat transport and thus a method to control streamers is strongly required to improve the plasma confinement. In the PANTA linear plasma device, discharge conditions to observe the streamer have been clarified [4] and numerical study on the dynamical transition from the streamer to the other turbulent state has started [5].…”