Non-uniform rotation and the resistive wall mode

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871954· OSTI ID:383780

Gimblett, C G ^[1]; Hastie, R J; Van der Linden, R A; Wesson, J A ^[2]

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1. UKAEA, Fusion (UKAEA/Euratom Fusion Association), Culham, Abingdon Oxon, OX14 3DB (United Kingdom)
2. JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (United Kingdom)

Advanced Tokamak Concepts [C. Kessel, J. Manickam, G. Rewoldt, and W. M. Tang, Phys. Rev. Lett. {bold 72}, 1212 (1994)] have been designed assuming that the {open_quote}{open_quote}Resistive Wall Mode{close_quote}{close_quote} (RWM) is stable. It has recently been shown that the RWM can be stabilized by a combination of strong uniform plasma rotation and visco-resistive dissipation. In this paper we examine the consequences of a sheared flow on the RWM, and contrast the results to the case of uniform flow. It is shown that, as for uniform flow, 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 to 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.

• OSTI ID: 383780
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 3; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ATC DEVICES
KINK INSTABILITY
PLASMA FLUID EQUATIONS
ROTATING PLASMA
SHEAR FLOW
STABILIZATION
WALL EFFECTS