Linear gyrokinetic calculations of toroidal momentum transport in a tokamak due to the ion temperature gradient mode

Journal Article · Fri Jul 15 00:00:00 EDT 2005 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.1949608· OSTI ID:20764403

Peeters, A G; Angioni, C ^[1]

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1. Max Planck Institut fuer Plasmaphysik, Botzmannstrasse 2 and D-85748 Garching bei Muenchen (Germany)

It is shown from a symmetry in the gyrokinetic equation that for up-down symmetric tokamak equilibria and for u{sub {phi}}>>{rho}{upsilon}{sub thi}/r (where u{sub {phi}} is the toroidal velocity, {upsilon}{sub thi} is the thermal ion velocity, {rho} is the Larmor radius, and r is the radius of the flux surface), the transport of parallel momentum can be written as the sum of a diffusive and a pinch contribution with no off-diagonal terms due to temperature and pressure gradients. The measured parallel velocity gradient in ASDEX Upgrade [O. Gruber, H.-S. Bosch, S. Guenter et al., Nucl. Fusion 39, 1321 (1999)] is insufficient to drive the parallel velocity shear instability. The parallel velocity is then transported by the ion temperature gradient mode. The diffusive contribution to the transport flux is investigated using a linear gyrokinetic approach, and it is found that the diffusion coefficient for parallel velocity transport divided by the ion heat conductivity coefficient is close to 1, and only weakly dependent on plasma parameters.

• OSTI ID: 20764403
• Journal Information: Physics of Plasmas, Vol. 12, Issue 7; Other Information: DOI: 10.1063/1.1949608; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASDEX TOKAMAK
CHARGED-PARTICLE TRANSPORT
DIFFUSION
ELECTRON TEMPERATURE
ION TEMPERATURE
LARMOR RADIUS
MAGNETIC CONFINEMENT
MAGNETIC SURFACES
PINCH EFFECT
PLASMA
PLASMA INSTABILITY
PLASMA PRESSURE
PRESSURE GRADIENTS
SHEAR
SYMMETRY
TEMPERATURE GRADIENTS
THERMAL CONDUCTIVITY
VELOCITY