Effects of orbit squeezing on poloidal mass flow and bootstrap current in tokamak plasmas

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.870484· OSTI ID:6907627

Shaing, K C ^[1]; Hsu, C T ^[2]; Hazeltine, R D ^[3]

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8071 (United States)
2. Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
3. Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712 (United States)

It is shown, by solving the drift kinetic equation, that the asymptotic values of the poloidal mass flow and the bootstrap current in the banana regime of large-aspect-ratio tokamak plasmas are not affected by orbit squeezing. However, because the definition of ion collisionality [upsilon][sub *[ital i]] is reduced by a factor [ital S][sup [minus]3/2], with [ital S]=1[minus]([rho][sub [ital pi]][ital d] ln [ital E][sub [ital r]]/[ital dr]) ([ital cE][sub [ital r]]/[ital B][sub [ital p]][nu][sub [ital ti]]), the values of both the poloidal mass flow and the bootstrap current at the banana--plateau transition are different from those of the conventional neoclassical theory. Here, [rho][sub [ital pi]] is the ion poloidal gyroradius, [ital E][sub [ital r]] is the radial electric field, [ital c] is the speed of light, [ital B][sub [ital p]] is the poloidal magnetic strength, [nu][sub [ital ti]] is the ion thermal speed, and [ital r] is the local radius. The implications for the experimental observations of poloidal rotation speeds in high mode (H mode) are discussed.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6907627
• Journal Information: Physics of Plasmas; (United States), Journal Name: Physics of Plasmas; (United States) Vol. 1:10; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700310* -- Plasma Confinement-- (1992-)
700330 -- Plasma Kinetics
Transport
& Impurities-- (1992-)
700340 -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
ASYMPTOTIC SOLUTIONS
BANANA REGIME
BOOTSTRAP CURRENT
CLOSED PLASMA DEVICES
CONFINEMENT
CURRENTS
ELECTRIC CURRENTS
EQUATIONS
KINETIC EQUATIONS
MASS
PLASMA
PLASMA CONFINEMENT
PLASMA DRIFT
ROTATING PLASMA
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRANSPORT THEORY
TRAPPING