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In order to study experimentally a parametric decay instability, near the lower hybrid frequency for which an ion quasi-mode is excited as the low frequency wave, a set up which is constituted of two ...coaxial electrodes is used. This set up has merits that the pumping voltage necessary to excite the decay instability is low enough to suppress ionization caused by the pumping and the high frequency pumping electric field can be measured with accuracy. Results of measurments of the pumping electric field verify that the threshold of the decay instability is well explained by taking account of the damping rate of both the Landau damping and the collisional damping, and the wavelength parallel to the magnetic field is equal to twice the plasma length along the field.続きを見る
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Mendeley出力
