Slowing down of charged particles in dusty plasmas with power‐law kappa‐distributions

Different plasma diagnostic methods are briefly discussed, and the framework of a test charge technique is effectively used as diagnostic tool for investigating interaction potentials in Lorentzian plasma, whose constituents are the superthermal electrons and ions with negatively charged dust grains. Applying the space-time Fourier transformations to the linearized coupled Vlasov-Poisson equations, a test charge potential is derived with a modified response function due to energetic ions and electrons. For a test charge moving much slower than the dust-thermal speed, there appears a short-range Debye-Hückel (DH) potential decaying exponentially with distance and a long-range far-field (FF) potential as the inverse cube of the distance from test charge. The FF potentials exhibit more localized shielding curves for low-Kappas, and smaller effective shielding length is observed in dusty plasma compared to electron-ion plasma. However, a wakefield (WF) potential is formed behind the test charge when it resonates with dust-acoustic oscillations, whereas a fast moving test charge leads to the Coulomb potential having no shielding around. It is revealed that superthermality and plasma parameters significantly alter the DH, FF, and WF potentials in space plasmas of Saturn’s E-ring, where power-law distributions can be used for energetic electrons and ions in contrast to Maxwellian dust grains.

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Section: Slow Moving Test Charge Responsementioning

confidence: 99%

Plasma Diagnostic Methods: Test Charge Response in Lorentzian Dusty Plasmas

Ali¹,

Al-Hadeethi²

2020

Selected Topics in Plasma Physics

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“…For numerical analyses, we can choose the data from the dusty plasma near Saturn's E ring, cited in Refs. [55][56][57][58] and many references therein. The data essentially corresponds to the Radio and Plasma Wave Science (RPWS) instruments onboard the Cassini spacecraft, containing the plasma parameters, such as n d0 ¼ 0:1cm �3 , n e0 ¼ 70cm �3 , Z d0 ¼ 300, T d ¼ T e =10, T i ¼ T e =2, and T e ¼ 4:642 � 10 5 K: The computation further helps us in finding the magnitude of the effective shielding length λ Dκ ¼ 15:649cm ð Þat the near-Maxwellian electrons and ions with κ i,e ¼ 100.…”

Section: Slow Moving Test Charge Responsementioning

confidence: 99%

Selected Topics in Plasma Physics

Singh¹

2020

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“…Based on these simplifications, we firstly calculate the Rosenbluth potential. The function h αβ (v) has been obtained, 28,50…”

Section: Relaxation Ratementioning

confidence: 99%

The collisional relaxation rate of kappa-distributed plasma with multiple components

Guo

2018

AIP Advances

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The kappa-distributed fully ionized plasma with collisional interaction is investigated.The Fokker-Planck equation with Rosenbluth potential is employed to describe such a physical system. The results show that the kappa distribution is not a stationary distribution unless the parameter kappa tends to infinity. The general expressions of collisional relaxation rate of multiple-component plasma with kappa distribution are derived and discussed in specific cases in details. For the purpose of visual illustration, we also give those results numerically in figures. All the results show that the parameter kappa plays a significant role in relaxation rate.

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Slowing down of charged particles in dusty plasmas with power‐law kappa‐distributions

Cited by 13 publications

References 48 publications

Plasma Diagnostic Methods: Test Charge Response in Lorentzian Dusty Plasmas

Plasma Diagnostic Methods: Test Charge Response in Lorentzian Dusty Plasmas

Selected Topics in Plasma Physics

The collisional relaxation rate of kappa-distributed plasma with multiple components

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