Published March 2004 | Version v1
Report Open

Excitation of geodesic acoustic mode in toroidal plasmas

Creators

  • 1. National Inst. for Fusion Science, Toki, Gifu (Japan)
  • 2. Max-Planck-Inst. fuer Plasmaphysik, Centre for Interdisciplinary Plasma Science, Garching (Germany)
  • 3. Kyushu Univ., Research Inst. for Applied Mechanics, Kasuga, Fukuoka (Japan)

Description

The instability of the geodesic acoustic mode (GAM) in tokamak turbulence is analyzed. It can be induced by dynamic shearing of the ambient turbulence by GAMs combined with the poloidal inhomogeneity of the turbulent flux. The dispersion relation is derived. The competition of the drive mechanism and the damping by turbulence viscosity is discussed. The GAMs are more unstable for high safety factors. (author)

Availability note (English)

Available from INIS in electronic form

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Additional details

Publishing Information

Imprint Pagination
12 p.
Report number
NIFS--795

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
35082805
Subject category
S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
Descriptors DEI
ANALYTICAL SOLUTION; EXCITATION; ION ACOUSTIC WAVES; NONLINEAR PROBLEMS; PLASMA; PLASMA INSTABILITY; SHEAR; TOROIDAL CONFIGURATION; TURBULENT FLOW; WAVE PROPAGATION
Descriptors DEC
ANNULAR SPACE; CLOSED CONFIGURATIONS; CONFIGURATION; ENERGY-LEVEL TRANSITIONS; FLUID FLOW; INSTABILITY; ION WAVES; MAGNETIC FIELD CONFIGURATIONS; MATHEMATICAL SOLUTIONS; PLASMA WAVES; SPACE

Optional Information

Notes
15 refs., 1 fig.