Effect of nanoparticles on an rf discharge afterglow

Schweigert, I. V.; Alexandrov, A. L.

doi:10.1088/0022-3727/45/32/325201

Cited by 19 publications

(12 citation statements)

References 26 publications

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“…Schweigert and Alexandrov [66] and Alexandrov et al [67] performed particle-in-cell (PIC) Monte Carlo collision (MCC) simulations to study the influence of nanoparticles on an argon plasma afterglow under conditions similar to the experiments by Berndt et al [52]. Using the simulated ion and electron energy distribution functions (IEDF and EEDF, respectively), Schweigert and Alexandrov [66] and Alexandrov et al [67] have shown that the loss of fast electrons to the electrode in the early afterglow (diffusion cooling) leads to a change of the electron and ion currents on the dust particle surfaces and a drop of the dust floating potential. Alexandrov et al [67] reported that the main production of desorbed electrons occurs during this electron cooling phase (30-50 μs into the afterglow).…”

Section: Influence Of Dust On Plasma Decaymentioning

confidence: 99%

Temporal dusty plasma afterglow: A review

Couëdel

2022

Front. Phys.

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In complex plasmas, dust particles are charged through their interactions with the electrons and ions of the surrounding plasma. In low-temperature laboratory plasmas, dust particles most commonly acquire a negative charge. In particular, in a laboratory glow-discharge plasma, the typical charge for a micrometer-size grain generally attains a few thousands of electronic charges. Under stable discharge conditions, this large negative charge is relatively well-characterized. However, for unsteady discharge conditions, the charge can differ and even fluctuate. In particular, when the power source of the discharge is turned off, the charged species of the plasma diffuse away and recombine into neutral species: this is a temporal afterglow. When dust particles are present inside a temporal plasma afterglow, the diffusion of charged species and the plasma decay dynamics are affected. Moreover, the dust particle charges also evolve during the afterglow period. In the late afterglow, dust particles are known to keep residual charges. The value of these residual charges strongly depends on the ambipolar-to-free diffusion transition. In addition, the presence of a constant electric field, causing ions to drift through the neutral gas, has a strong influence on the final dust particle residual charges, eventually leading to large positive residual charges. In this review article, the dynamics of temporal complex plasma afterglow are discussed. Experimental and theoretical results are presented. The basics of temporal afterglow modeling are also given.

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Section: Influence Of Dust On Plasma Decaymentioning

confidence: 99%

Temporal dusty plasma afterglow: A review

Couëdel

2022

Front. Phys.

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“…As shown experimentally in (Berndt et al 2006), application of the RF field can decrease the n e in dusty plasma by many times. The specific nature of this effect, which is being debated (Schweigert & Alexandrov 2012), is not important for our discussion. What is important, however, is that the effect is local and much stronger than that caused by ponderomotive expulsion (Zheng 1990).…”

Section: Rf Emission Mechanismmentioning

confidence: 99%

Are Perytons Signatures of Ball Lightning?

Dodin

Fisch

2014

ApJ

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The enigmatic downchirped signals, called "perytons," that are detected by radio telescopes in the GHz frequency range may be produced by an atmospheric phenomenon known as ball lightning (BL). If BLs act as nonstationary radio frequency cavities, their characteristic emission frequencies and evolution timescales are consistent with peryton observations, and so are general patterns in which BLs are known to occur. Based on this evidence, testable predictions are made that can confirm or rule out a causal connection between perytons and BLs. In either case, how perytons are searched for in observational data may warrant reconsideration because existing procedures may be discarding events that have the same nature as known perytons.

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“…The dust charge in the glow regime may be found assuming an equal flux of ions and electrons to its surface. This approach also allows to estimate the dust charge in the afterglow plasma [24].…”

Section: Dust Charge and Forces Affecting A Dust Particlementioning

confidence: 99%

“…Plasma inhomogeneity effects and dust motion were taken into account in the models of Schweigert and Alexandrov [24] and Kravchenko et al [25], where dusty plasma afterglows were studied using PIC-MCC simulations. In [26], the behavior of a nanodusty plasma afterglow was examined, using a sectional model and also accounting for the plasma inhomogeneity and the transport of dust particles due to the effect of different forces.…”

Section: Introductionmentioning

confidence: 99%

Dust dynamics during the plasma afterglow

Denysenko¹,

Mikikian²,

Azarenkov³

2021

J. Phys. D: Appl. Phys.

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The charge and dynamics of dust particles in an afterglow plasma are studied using a 1D model in the diffusion approximation, taking into account the transition from ambipolar to free diffusion. It is analyzed how external conditions (dust particle size, neutral gas pressure and initial electron density) affect the dust motion. The dust particle dynamics has been examined in microgravity conditions and in presence of gravity. Without gravity, the location of dust particles in plasma volume may change essentially during the afterglow if the dust size and pressure are small (⩽10 nm and ⩽30 mTorr, respectively). At small pressures, in the very beginning of afterglow, small nanoparticles move to the plasma boundary because the ion drag force dominates over the electric force. At afterglow times when the electron temperature becomes time-independent, the ion drag force decreases faster with time than the electric force due to the ion density decrease, and dust particles may move to the slab center. In presence of gravity, the effect of gravity force on dust particles is important only at large afterglow times (t ⩾ 10 ms), when the electric and ion drag forces are small. The dust dynamics depends essentially on the initial plasma density. If the density is large (∼1012 cm−3), small nanoparticles (⩽10 nm) may deposit on plasma walls in the beginning of plasma afterglow because of an enhancement of the ion drag force.

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Effect of nanoparticles on an rf discharge afterglow

Cited by 19 publications

References 26 publications

Temporal dusty plasma afterglow: A review

Temporal dusty plasma afterglow: A review

Are Perytons Signatures of Ball Lightning?

Dust dynamics during the plasma afterglow

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