Comparison between Double-Resonant and Non-Resonant Mode Driven Convections in a Stellarator with a Non-Monotonic Rotational Transform

For a stellarator (or tokamak) with a non-monotonic rotational transform, both the double-resonant and non-resonant interchange type modes become unstable, when the magnetic curvature is unfavorable in a finite region including the zero magnetic shear surface r=rs. These modes generate convective mo...

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Bibliographic Details
Published in:	Journal of the Physical Society of Japan Vol. 70; no. 4; pp. 983 - 987
Main Authors:	UNEMURA, Takeshi, HAMAGUCHI, Satoshi, WAKATANI, Masahiro
Format:	Journal Article
Language:	English
Published:	Tokyo Institute of Pure and Applied Physics 01-04-2001 Physical Society of Japan The Physical Society of Japan
Subjects:	Exact sciences and technology Magnetic confinement and equilibrium Physics Physics of gases, plasmas and electric discharges Physics of plasmas and electric discharges Plasma turbulence Stellarators, spheromaks, compact tori, bumpy tori, and other toroidal confinement devices Stellarators, torsatrons, heliacs, bumpy tori, and other toroidal confinement devices Waves, oscillations, and instabilities in plasmas and intense beams Rotational transform Convective instabilities Interchange instability Poloidal field Simulation Shear flow Theoretical study Stellarators Resonant process Nonlinear systems
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Summary:	For a stellarator (or tokamak) with a non-monotonic rotational transform, both the double-resonant and non-resonant interchange type modes become unstable, when the magnetic curvature is unfavorable in a finite region including the zero magnetic shear surface r=rs. These modes generate convective motions and poloidal shear flows. The non-resonant mode driven convection affects the r [congruent with] rs region significantly, although a decrease of central density is seen. On the other hand, the double-resonant mode driven convection affects the central region for a peaked density profile and a stair-like decrease of the central density is seen. The evolution of the density profile is also correlated with the behavior of the nonlinearly generated poloidal flow.
ISSN:	0031-9015 1347-4073
DOI:	10.1143/JPSJ.70.983