Gyroradius scaling of electron and ion transport

Journal Article · Mon Mar 06 04:00:00 EST 1995 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.74.1763· OSTI ID:6582573

Petty, C C; Luce, T C; Pinsker, R I; Burrell, K H; Chiu, S C; Gohil, P; James, R A; Wroblewski, D ^[1]

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1. General Atomics, San Diego, California 92186-9784 (United States)

The scaling of heat diffusion with relative gyroradius [rho][sub *] is measured on the DIII-D tokamak using dimensionally similar discharges. For the first time, a two-fluid transport analysis allows the [rho][sub *] scaling of the electron and ion fluids to be determined separately. The electron diffusivity is found to scale like [chi][sub [ital e]][proportional to][chi][sub [ital B]][rho][sub *][sup 1.1[plus minus]0.3] (gyro-Bohm-like) while the ion diffusivity is found to scale like [chi][sub [ital i]][proportional to][chi][sub [ital B]][rho][sub *][sup [minus]0.5[plus minus]0.3] (Goldston-like). The scaling of the global confinement time and the effective diffusivity can vary from gyro-Bohm-like to Bohm-like depending upon whether the electrons or ions dominate the heat transport.

• DOE Contract Number: AC03-89ER51114
• OSTI ID: 6582573
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 74:10; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700370* -- Plasma Fluid & MHD Properties-- (1992-)
CHARGED PARTICLES
CLOSED PLASMA DEVICES
DIFFUSION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY TRANSFER
FERMIONS
FLUID FLOW
HEAT TRANSFER
IONS
LEPTONS
SCALING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRANSPORT THEORY
TURBULENCE