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lnvariant imbedding theory approach to mode conversion in cold, unmagnetized plasmas
- Alternative Title
- 유대중
- Author(s)
- 유대중
- Alternative Author(s)
- 유대중
- Advisor
- 김기홍
- Department
- 일반대학원 물리학과
- Publisher
- The Graduate School, Ajou University
- Publication Year
- 2007-02
- Language
- eng
- Alternative Abstract
- In this research, we study the influence of periodic and random plasma density variations on mode conversion phenomena theoretically. We also study the interplay between surface plasmon excitations and mode conversion. For this purpose, we apply the invariant imbedding method to mode conversion phenomena in cold, unmagnetized and stratified plasmas, where the conversion from electromagnetic modes to electrostatic oscillations is induced by the inhomogeneity of plasma media. Ions are assumed to be static in the entire region and only electron density variations are considered. For various density configurations, we obtain unusual results which have never been presented before. At first, we investigate the case where the electron density varies linearly in the plasma medium and find that the mode conversion efficiency is strongly affected by the slope of the density profile. Next, we consider the case of periodic electron density configurations and find that the interference of multiply-scattered waves influences mode conversion strongly. We also study the cases where periodic or random density variations are superposed onto the linear profile. In the periodic case, we find that a complete mode conversion is possible when certain conditions are satisfied. In the random case, we find that the Anderson localization effect due to randomness affects mode conversion phenomena in an interesting manner. Finally, we consider the case where there is an interplay between surface plasma waves on the plasma boundary and mode conversion inside the medium. We observe that the mode conversion efficiency can be enhanced by surface plasmon excitations.
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- Appears in Collections:
- Graduate School of Ajou University > Department of Physics > 3. Theses(Master)
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