Trapped ion mode in toroidally rotating plasmas

Journal Article · Fri Sep 01 04:00:00 EDT 1995 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871173· OSTI ID:123608

Artun, M; Tang, W M; Rewoldt, G ^[1]

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1. Princeton University Plasma Physics Laboratory, P. O. Box 451, Princeton, New Jersey 08543-0451 (United States)

The influence of radially sheared toroidal flows on the Trapped Ion Mode (TIM) is investigated using a two-dimensional eigenmode code. These radially extended toroidal microinstabilities could significantly influence the interpretation of confinement scaling trends and associated fluctuation properties observed in recent tokamak experiments. In the present analysis, the electrostatic drift kinetic equation is obtained from the general nonlinear gyrokinetic equation in rotating plasmas [M. Artun and W. M. Tang, Phys. Plasmas {bold 1}, 2682 (1994)]. In the long perpendicular wavelength limit {ital k}{sub {ital r}}{rho}{sub {ital bi}}{much_lt}1, where {rho}{sub {ital bi}} is the average trapped ion banana width, the resulting eigenmode equation becomes a coupled system of second order differential equations for the poloidal harmonics. These equations are solved using finite element methods. Numerical results from the analysis of low and medium toroidal mode number instabilities are presented using representative Low confinement mode (L-mode) experimental data followed by a discussion of numerical results. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• Research Organization: Princeton Plasma Physics Laboratory
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 123608
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 9 Vol. 2; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
EIGENSTATES
FINITE ELEMENT METHOD
KINETIC EQUATIONS
PLASMA CONFINEMENT
PLASMA DRIFT
PLASMA MICROINSTABILITIES
PLASMA SIMULATION
ROTATING PLASMA
TFTR TOKAMAK
TOKAMAK DEVICES
TRAPPED-PARTICLE INSTABILITY