Enhancement of the Bootstrap Current in a Tokamak Pedestal

Journal Article · Fri Jul 23 04:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.045002· OSTI ID:21410937

Kagan, Grigory ^[1]; Catto, Peter J ^[1]

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1. Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

The strong radial electric field in a subsonic tokamak pedestal modifies the neoclassical ion parallel flow velocity, as well as the radial ion heat flux. Existing experimental evidence of the resulting alteration in the poloidal flow of a trace impurity is discussed. We then demonstrate that the modified parallel ion flow can noticeably enhance the pedestal bootstrap current when the background ions are in the banana regime. Only the coefficient of the ion temperature gradient drive term is affected. The revised expression for the pedestal bootstrap current is presented. The prescription for inserting the modification into any existing banana regime bootstrap current expression is given.

• OSTI ID: 21410937
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 105; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BANANA REGIME
BOOTSTRAP CURRENT
CHARGED PARTICLES
CHARGED-PARTICLE TRANSPORT THEORY
CLOSED PLASMA DEVICES
CURRENTS
ELECTRIC CURRENTS
ELECTRIC FIELDS
HEAT FLUX
IMPURITIES
ION TEMPERATURE
IONS
MODIFICATIONS
NEOCLASSICAL TRANSPORT THEORY
PLASMA IMPURITIES
TEMPERATURE GRADIENTS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRANSPORT THEORY
TRAPPING