Nonlocal plasma edge density reduction due to lower hybrid waves
نویسندگان
چکیده
منابع مشابه
Lower-hybrid waves in a plasma with negative ions
The introduction of an electronegative gas (i.e., a gas with a large electron attachment cross section, e.g., SF6) into a plasma has made it possible to study plasmas in which the negative ion density can be much larger than the electron density. lp2 In such a plasma, new phenomena may be expected to occur, in particular, various electrostatic wave modes are modified by the presence of negative...
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In the present paper we consider the interaction between energetic ions and lower hybrid waves in tokamak plasmas and study the parametric dependence of the threshold condition for stochastic ion di usion. It is shown that the threshold condition as obtained in the work by Karney [C. F. F. Karney, Phys. Fluids 22, 2188 (1979)] may be not easily satis ed in present day large tokamaks, but can at...
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The propagation of lower hybrid waves in the presence of ponderomotive density fluctuations is considered. The problem is treated in two dimensions and, in order to be able to correctly impose the boundary conditions, the waves are allowed to evolve in time. The fields are described by ivτ − ∫ vξ dζ+vζζ + |v| v = 0 where v is proportional to the electric field, τ to time, and ζ and ξ measure di...
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[1] We present a theoretical and numerical study of linear mode conversion of lower hybrid waves interacting with short-scale density striations in the Earth’s ionosphere. The efficiency of the conversion process is investigated for different sets of parameters such as the angle of incidence, the wavelength of the lower hybrid wave, and the size of the striation. It is found that the most effic...
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Conditions for trapping of lower hybrid waves in plasma depletions in the Earth’s ionosphere are discussed. It is shown that the trapping can take place for the frequencies not only below but also above the lower hybrid resonance frequency of the background plasma, which is important for the formation of the downshifted maximum of the secondary electromagnetic emission. © 2007 Elsevier B.V. All...
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ژورنال
عنوان ژورنال: Physical Review A
سال: 1982
ISSN: 0556-2791
DOI: 10.1103/physreva.25.1247