Electromagnetic effects on geodesic acoustic modes

Journal Article · Fri Aug 15 00:00:00 EDT 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4891883· OSTI ID:22303776

Smolyakov, A. I. ^[1]; Elfimov, A. G. ^[2]; Melnikov, A. V. ^[3]; Murtaza, G. ^[4]

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1. University of Saskatchewan, 116 Science Place, Saskatoon S7N 5E2 (Canada)
2. Institute of Physics, University of São Paulo, São Paulo 05508-090 (Brazil)
3. Institute of Tokamak Physics, NRC “Kurchatov Institute,” 123182 Moscow (Russian Federation)
4. Visiting Professor, Department of Physics, Quaid-e-Azam University, Islamabad (Pakistan)

By using the full electromagnetic drift kinetic equations for electrons and ions, the general dispersion relation for geodesic acoustic modes (GAMs) is derived incorporating the electromagnetic effects. It is shown that m = 1 harmonic of the GAM mode has a finite electromagnetic component. The electromagnetic corrections appear for finite values of the radial wave numbers and modify the GAM frequency. The effects of plasma pressure β{sub e}, the safety factor q, and the temperature ratio τ on GAM dispersion are analyzed.

• OSTI ID: 22303776
• Journal Information: Physics of Plasmas, Vol. 21, Issue 8; Other Information: (c) 2014 AIP Publishing LLC; 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
CORRECTIONS
DISPERSION RELATIONS
DISPERSIONS
ELECTRONS
KINETIC EQUATIONS
PLASMA PRESSURE
SAFETY