Abstract
The stability of the nonresonant external kink modes in a reversed field pinch (RFP) under resistive wall boundary conditions is investigated. The effects of toroidal plasma rotation and parallel viscosity, as well as the finite β are included in the analysis. The influence of the equilibrium parameters on the mode instability is carefully studied by employing the conventional α–Θ0 equilibrium models. It is found that the behavior of the resistive wall mode (RWM) is rather sensitive to the reversal parameter F of RFPs. The effects of plasma rotation together with the viscosity and/or ion sound wave continuous spectrum damping can stabilize the RWM for certain positions of the wall relative to the plasma for both the low β (or zero β) and high β plasmas. For typical RFP operating parameters, the rotation velocity required to stabilize the modes is in the range between the ion sound wave and Alfvén wave velocities. This is larger than the natural rotation velocity in current RFPs, hence based on the above linear theory active feedback is needed for a long pulse RFP. A further nonlinear study is necessary.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
