“…As the rise time is increased from zero, the ion burst previously identified as a pseudowave slows down and appears to be absorbed in the reflected ion-soliton signals. This rise-time dependence has also been seen in the laboratory (Lonngren et al 1970).…”
Using a particle-in-cell code, we are able to simulate the excitation
of ion
acoustic solitons from a grid whose potential is suddenly increased. The
numerical results are in substantial agreement with previous laboratory
experiments.
“…As the rise time is increased from zero, the ion burst previously identified as a pseudowave slows down and appears to be absorbed in the reflected ion-soliton signals. This rise-time dependence has also been seen in the laboratory (Lonngren et al 1970).…”
Using a particle-in-cell code, we are able to simulate the excitation
of ion
acoustic solitons from a grid whose potential is suddenly increased. The
numerical results are in substantial agreement with previous laboratory
experiments.
The time evolution of an ion distribution function is computed in the sheath about a negatively pulsed transparent grid. The algorithm details the ion flow in the potential well when the pulse is on and the burst of ions ejected after the pulse potential is removed.
Experiments on the excitation of ion acoustic solitons using a fine mesh grid in a normal two component plasma are described. The excitation is novel in that a modulated high-frequency sinusoidal wave voltage signal is applied to the grid. The carrier frequency of the high-frequency sinusoidal wave is above the ion plasma frequency. An interpretation of the velocity modulation and bunching of free streaming ions that pass through the grid to which the signal is applied is given.
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