The propagation of linear lower hybrid waves in an inhomogeneous plasma is studied under the assumption that the wave field has a relatively narrow spectrum of wave-numbers. The lowest-order electromagnetic correction, neglected in the electrostatic approximation, is included. It is shown that this electromagnetic correction can produce focusing of the wave envelope in the outer layers of typical large-tokamak plasmas. This focusing is a linear effect due to the opposition of thermal and electromagnetic dispersion.
非一様プラズマ中の線形低域混成波の伝搬を、波動場が比較的狭い波数スペクトルを持つという仮定の下で研究する。静電近似で無視されていた最低次の電磁補正を含める。この電磁補正が、典型的な大型トカマクプラズマの外層において波の包絡線の集束を生じ得ることを示す。この集束は、熱的分散と電磁的分散の対抗による線形効果である。