Experimental observation of electron-acoustic wave propagation in laboratory plasma

Chowdhury, Satyajit; Biswas, Subir; Chakrabarti, Nikhil; Pal, Rabindranath

doi:10.1063/1.4985680

Cited by 33 publications

(14 citation statements)

References 25 publications

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“…As a comparison, the numerical calculations give ω num r = 0.893745 and γ num = −0.044221 in terms of Eq. (7). The relative errors between the simulations and numerical results are about 0.003% and 0.672% for the wave frequency and damping rate, respectively.…”

Section: Verification By Vlasov-poisson Simulationsmentioning

confidence: 85%

“…We select the time step as ∆t = 0.005. The solid lines are the simulation results, while the dashed lines are the numerical solutions from the dispersion (7).…”

Section: Verification By Vlasov-poisson Simulationsmentioning

confidence: 99%

“…4 In addition to the theoretical works, the EAWs have been observed experimentally in different laboratory plasmas. [5][6][7] In space plasmas, the EAWs are essential for explaining the formation of the broadband electrostatic noises. 8,9 However, several recent observations indicate that the kappa distribution is more suitable than the Maxwellian one to model space plasmas, such as solar wind, 10,11 solar corona, 12,13 and planetary magnetosphere.…”

Section: Introductionmentioning

confidence: 99%

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The electron acoustic waves in plasmas with two kappa-distributed electrons at the same temperatures and immobile ions

Guo

2021

Preprint

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The linear electron acoustic waves propagated in plasmas consisting of two kappadistributed electrons and stationary ions are investigated. The temperatures of the two electrons are assumed to be the same, but the kappa indices are not. It shows that if one kappa index is small enough and the other one large enough, a weak damping regime of the electron acoustic waves exists. The dispersion and damping rate are studied numerically. The parameter spaces for the weakly damped electron acoustic waves are analyzed. Besides, the electron acoustic waves in the present model are compared with those in the plasmas with two-temperature electrons. At last, we perform the Vlasov-Poisson simulations to verify the theory.

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Section: Verification By Vlasov-poisson Simulationsmentioning

confidence: 85%

“…We select the time step as ∆t = 0.005. The solid lines are the simulation results, while the dashed lines are the numerical solutions from the dispersion (7).…”

Section: Verification By Vlasov-poisson Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The electron acoustic waves in plasmas with two kappa-distributed electrons at the same temperatures and immobile ions

Guo

2021

Preprint

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“…[ 40 ] Nonthermal ions were also observed by the Nozomi satellite in the vicinity of the Moon. [ 41 ] Recently, Chowdhury et al [ 42 ] reported the direct observation of propagating EAWs in a very small wavenumber regime after being excited in the Magnetized Plasma Linear Experimental (MaPLE) device.…”

Section: Introductionmentioning

confidence: 99%

Propagation properties of dust‐electron‐acoustic waves in weakly magnetized dusty nonthermal plasmas

Bhowmick

Sahu

2020

Contributions to Plasma Physics

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The linear and nonlinear properties of dust-electron acoustic waves (DEAWs) propagating in magnetized, collisionless, dusty plasma system containing inertial cold electrons, Maxwellian hot electrons, nonthermal ions, and arbitrarily (positively or negatively) charged stationary dust are investigated. The reductive perturbation technique is employed to reduce the basic set of fluid equations to the modified Korteweg-de Vries equation or Ostrovsky's equation, which governs the dynamics of small amplitude DEAWs in a weakly magnetized dusty nonthermal plasma. The approximate analytical as well as numerical solutions reveal that the basic characteristics of DEA nonlinear structures are found to be significantly modified by the key plasma configuration parameters. It is found that the leading compressive or rarefactive solitary wave structure separates from a trailing wave packet during a considerable time under the influence of magnetic field-induced Lorentz force.

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“…However, isothermal electrons with two different temperatures can also naturally coexist with the ions in both space and laboratory plasmas. [63,64] The presence of two-temperature electrons in a dusty plasma can significantly modify the critical point and hence affect the behaviour of dust acoustic solitary waves and double-layer structures profoundly. In this article, we investigate non-linear properties of DAWs in a dusty plasma, for the first time, with two temperature electrons and two temperature ions assuming constant charge on dust particles.…”

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confidence: 99%

Non‐linear coherent structures in multi‐species dusty plasma

Shome

Pramanik

2021

Contributions to Plasma Physics

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In a fluid description, theoretical investigation has been carried out to explore how the presence of two-temperature electron fluids (hot and cold) influences the characters of dust acoustic solitary waves, double layers, bipolar structures, etc. in a multi-component dusty plasma, composed of isothermal electrons and ions, along with the negatively charged, cold dusts. A reductive perturbation method is used to derive the well-known Korteweg-de Vries (KdV) equation, which describes the basic nature of the dust acoustic solitary waves.Two values of critical ion density exist, which distinguish the regions of compressive and rarefactive solitary waves in parametric space. The critical points directly depend on the densities and temperatures of the electron fluids. With increasing temperature of hot electron fluid, one of the two critical ion densities decreases, and the other one increases. Ultimately, they merge with each other when the temperature of hot electrons reaches a particular value. The amplitude of the dust acoustic soliton gets modified due to the presence of two-temperature electron fluids. The study is extended further by deriving modified KdV and Gardner equations at the vicinity of critical points. The Gardner equation reveals the existence of double layer and bipolar structures. In these processes, the effects higher-order nonlinearities are incorporated methodically, by implementing appropriate stretching of the coordinates. Sagdeev's pseudopotential analysis shows that large amplitude rarefactive solitary waves only exist when the corresponding Mach number (M) lies within 1 < M < M c . The upper bound, M c increases with the hot electron temperature and cold electron density. The results presented in this investigation are believed to be applicable in the laboratory and astrophysical plasmas.

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Experimental observation of electron-acoustic wave propagation in laboratory plasma

Cited by 33 publications

References 25 publications

The electron acoustic waves in plasmas with two kappa-distributed electrons at the same temperatures and immobile ions

The electron acoustic waves in plasmas with two kappa-distributed electrons at the same temperatures and immobile ions

Propagation properties of dust‐electron‐acoustic waves in weakly magnetized dusty nonthermal plasmas

Non‐linear coherent structures in multi‐species dusty plasma

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