Abstract
The limitation in amplitude of ion-acoustic solitons or laminar shocks excitable in a double plasma device is clarified to result from the effect of pulsed fast beam ions, generated by the pulse externally applied for wave excitation. Beam ions faster than the soliton, which suppress the growth of the proto-soliton amplitude at an early stage of wave excitation, are always generated in the case of the double plasma (DP)-excitation, when a pulse high enough is applied so as to excite a large amplitude soliton. Controlling the generation of such fast beam ions by adjusting the rise time of the applied pulse, ion-acoustic solitons or laminar shocks of high Mach numbers up to M≃1.4 are observed to be formed even in a plasma with a finite ion temperature such as Ti≃Te/20.
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