Non-Uniform Rotation and the Resistive Wall Mode
Advanced Tokamak Concepts have been designed assuming that the Resistive Wall Mode (RWM) is stable. It has recently been shown that the RWM can be stabilized by a combination of strong uniform plasma rotation and viscoresistive dissipation. This paper examines the consequences of a sheared flow on the RWM, and contrasts the results to the case of uniform flow. It is shown that, as for uniform, the rotation initially further destabilizes the resistive wall mode, but for higher rotation velocities the growth rate is reduced, and the presence of plasma dissipation may completely stabilize the mode. However, sheared rotation allows the possibility of the RWM coupling with and converting into a Kelvin Helmholtz mode. It is shown that the position of the wall with respect to the critical position for stabilization of the external kink mode is of crucial importance.
Bibliographic Reference: Article: Physics of Plasmas (1995)
Record Number: 199610396 / Last updated on: 1996-04-15
Original language: en
Available languages: en