Effects of fast beam ions on ion-acoustic solitons and shocks excited in a double plasma device

Honzawa, Tadao; Nagasawa, Takeshi

doi:10.1063/1.872516

Cited by 15 publications

(6 citation statements)

References 18 publications

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“…This pseudowave is important because its velocity can be controlled by the applied excitation voltage and, thus, the wave-particle interaction between the ionacoustic wave and the burst ions can be studied via observing the evolution of the excited signals. [26,27] Previous observations of the pseudowaves were only in plasmas without stationary ion beams. In an ion-beam-plasma system, the pseudowave and its coexistence with the normal modes were observed and identified only recently in the downstream of the beam.…”

Section: Introductionmentioning

confidence: 99%

Upstream ion wave excitation in an ion-beam–plasma system

Wei

et al. 2018

Chinese Phys. B

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Plasma normal modes in ion-beam-plasma systems were experimentally investigated previously only for the waves propagating in the downstream (along the beam) direction. In this paper, the ion wave excitation and propagation in the upstream (against the beam) direction in an ion-beam-plasma system were experimentally studied in a double plasma device. The waves were launched by applying a ramp voltage to a negatively biased excitation grid. Two kinds of wave signals were detected, one is a particle signal composed of burst ions and the other is an ion-acoustic signal arising from the background plasma. These signals were identified by the dependence of the signal velocities on the characteristics of the ramp voltage. The velocity of the burst ion signal increases with the decrease of the rise time and the increase of the peak-to-peak amplitude of the applied ramp voltage while that of the ion-acoustic signal is independent of these parameters. By adjusting these parameters such that the burst ion velocity approaches to the ion-acoustic velocity, the wave-particle interaction can be observed.

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Section: Introductionmentioning

confidence: 99%

Upstream ion wave excitation in an ion-beam–plasma system

Wei

et al. 2018

Chinese Phys. B

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“…τ = −0.2 and τ = −0.8, then nonplanar parabolic solitons exist in the opposite direction for ξ < 0 (see the curves in figure 3(a)). It is important to see here that transformation (21) couples the coordinates η and τ , and so the geometrical effects appear due to the interplay of these coordinates for IA solitons with transverse perturbations. Such solitons are also termed as horseshoe solitons [44,49,50] and cannot be seen in (ξ, τ ) plane for the fixed values of η (see figure 3(b)).…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, to find a solitonic solution of the CTKP equation ( 20), we again employ the method of dependent variable transformation (21) to express the nPDE in the form of an ordinary differential equation, as…”

Section: Solutions Of Ctkpb and Ctkp Equationsmentioning

confidence: 99%

“…In this regard, Washimi and Taniuti [16] have presented a KdV equation in an unmagnetized plasma to describe the basic nonlinear characteristics of small-amplitude planar IA solitons with cold ions and isothermal hot electrons. Later, numerous investigations have been carried out to study the properties of IA solitons [17,18] and shocks [19][20][21] by taking into account the Maxwellian (isothermal) electrons in unmagnetized plasmas. However, the modeling of plasma particles with a Maxwellian distribution function is not always true, presenting a crude picture in space environments when plasma particles are highly energetic and nonthermal.…”

Section: Introductionmentioning

confidence: 99%

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Nonplanar ion-acoustic solitons and shocks with superthermal trapped electrons and transverse perturbations

Jahangir¹,

Ali²

2022

Plasma Phys. Control. Fusion

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The formation and propagation of nonlinear ion-acoustic (IA) waves are studied in an unmagnetized cold viscous plasma, comprising the inertial ions and superthermal trapped electrons in cylindrical geometry with transverse perturbations. The most well-known reductive perturbation method is employed to derive cylindrical trapped Kadomtsev Petviashvili Burgers (CTKPB) and cylindrical trapped Kadomtsev Petviashvili (CTKP) equations with and without dissipation effects, respectively. The exact solutions of CTKPB and CTKP equations are obtained for the first time by utilizing the dependent variable transformation. The soliton and shock structures are found to be significantly affected by the plasma parameters including the trapping efficiency parameter β, the superthermality parameter κ, viscosity μ₀ and the geometrical effects. Importantly, the geometrical effects and transverse perturbations alter the shape of solitons and shocks, resulting into the parabolic nonlinear structures. These structures become more parabolic at later times due to an interplay of transverse and time coordinates (η, τ). The results of the present study might be helpful to understand the characteristics of IA structures in space plasmas, such as auroral regions, where energetic trapped electrons have been observed.

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“…For instance, the coupling between the burst-ions and the ion-acoustic wave can result in the amplification of the latter and the formation of the ion-acoustic solitons and shocks. [24][25][26] However, the observation of the pseudowaves were not reported in previous wave-excitation experiments conducted in ion-beam-plasma systems.…”

Section: Introductionmentioning

confidence: 91%

Observation of double pseudowaves in an ion–beam–plasma system

Wei¹,

Ma²,

2018

Chinese Phys. B

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Pseudowaves, known as burst-ion signals, which are different from plasma normal modes, exist frequently in ionwave excitation experiments when launching the waves by applying a pulsed voltage to a negatively biased grid. In previous experiments, only one kind of the pseudowave was observed. In this paper, we report the observation and identification of double pseudowaves in an ion-beam-plasma system. These pseudowaves originate from two ion groups: the burst of the beam ions and the burst of the background ions. It was observed that the burst of the background ions was in the case of high ion beam energy, while the burst of the beam ions was in the case of low ion beam energy. By observing the dependence of the signal velocities on the characteristics of the excitation voltage, these pseudowaves can be identified. It was also observed that the burst ion signal originating from the background ions can interact with slow beam mode and that originating from the beam ions can interact with fast beam mode.

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Effects of fast beam ions on ion-acoustic solitons and shocks excited in a double plasma device

Cited by 15 publications

References 18 publications

Upstream ion wave excitation in an ion-beam–plasma system

Upstream ion wave excitation in an ion-beam–plasma system

Nonplanar ion-acoustic solitons and shocks with superthermal trapped electrons and transverse perturbations

Observation of double pseudowaves in an ion–beam–plasma system

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