Introduction to Dusty Plasma Physics

Shukla, P. K.; Mamun, A. A.

doi:10.1088/0741-3335/44/3/701

Cited by 218 publications

(265 citation statements)

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“…Collapse of quasi‐neutrality is observed where sheath region begins . According to assumption, the dust particle number density is the same in both inside and outside the cloud, that is, Z d n d0 = Z d n d , for linear case . The plasma is considered as to be one dimensional sheath and in thermal equilibrium, such as that potential in plasma sheath is given by Poisson's equation for x > 0 as

\frac{d^{2} φ (x)}{d x^{2}} = \frac{- e}{ϵ_{0}} [n_{i} (x) - n_{e} (x) - n_{italicrd} - Z_{d} n_{d} (φ (x))]

where n d (φ(x)) is the dust density which is assumed to be dependent on φ(x) and also another condition where independent of φ(x) and n rd is density of thermionic emitted electrons near to the wall at the minimum potential φ vc can be written as

n_{normalee} (x) = n_{italicee}^{0} exp [\frac{- e ((), φ_{w} - φ_{vc})}{k_{B} T_{w}}] \equiv n_{italicrd}

…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The word “dusty plasma” is sometimes confused with “dust in plasma” and differences between them can be understood in terms of Debye length ( λ D ) and spacing between two charge grains ( a ) in plasma system. In dusty plasma the distance ( a ) between two dust particles is less than the Debye length ( λ D > a ) whereas in “dust in plasma” it is the opposite case ( λ D < a ) . These dust particles becomes charged, depending upon the actual plasma environment.…”

Section: Introductionmentioning

confidence: 99%

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Potential profile near the virtual cathode in presence of charged dust

Rathod¹,

Dash²,

Sarma³

2019

Contributions to Plasma Physics

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In this work, concept of virtual cathode and its existence in dusty plasma has been studied by theoretical and numerical analysis. Using basic equations of charge dust, ions, and electrons, the non‐monotonic behaviour of the potential in presence of charged dust has been calculated and plotted as a function of dust density. It has been found that there is a change in potential between cathode and sheath potential and subsequently changes the threshold wall temperature as compared to that of without dust conditions. The threshold wall temperature has been increased due to the ability of micro‐particles acquiring electron charge and hence, reducing potential at the wall. Further, for different values of α (depends on dust density); threshold temperature remained the same for observed virtual cathode. Hence, behaviour of potential has been plotted as a function of α with increasing wall temperatures for two dust charge values (1 and 1,000). Considering no dust charge, it has been observed that, at lower dust density, double layer like structure is formed near the emissive wall. But this double layer structure gets diminishes with increasing dust density. Hence, below a threshold dust density, virtual cathode near to the emissive wall is not possible. While for Zd = 1,000, the formation of virtual cathode appeared even at very small dust density. However, irrespective of variation of potential difference near the wall and existence of virtual cathode at different emission regime the threshold wall temperature remains same. Effect of dust potential dependency on threshold wall temperature has also been discussed in this study.

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\frac{d^{2} φ (x)}{d x^{2}} = \frac{- e}{ϵ_{0}} [n_{i} (x) - n_{e} (x) - n_{italicrd} - Z_{d} n_{d} (φ (x))]

n_{normalee} (x) = n_{italicee}^{0} exp [\frac{- e ((), φ_{w} - φ_{vc})}{k_{B} T_{w}}] \equiv n_{italicrd}

…”

Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Potential profile near the virtual cathode in presence of charged dust

Rathod¹,

Dash²,

Sarma³

2019

Contributions to Plasma Physics

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“…This phenomenon is the consequence of the drift force and/or of a steep magnetic field gradient that results to the coupling of electrons and ions motions in magnetized plasmas. 22 The lower hybrid frequency f lh is given by the general equation…”

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confidence: 99%

Observation of plasma instabilities related to dust particle growth mechanisms in electron cyclotron resonance plasmas

et al. 2013

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Instabilities are observed in the self-bias voltage measured on a probe immersed in microwave plasma excited at Electron Cyclotron Resonance (ECR). Observed in the MHz range, they were systematically measured in dust-free or dusty plasmas (obtained for different conditions of applied microwave powers and acetylene flow rates). Two characteristic frequencies, well described as lower hybrid oscillations, can be defined. The first one, in the 60-70 MHz range, appears as a sharp peak in the frequency spectra and is observed in every case. Attributed to ions, its position shift observed with the output power highlights that nucleation process takes place in the dusty plasma. Attributed to lower hybrid oscillation of powders, the second broad peak in the 10-20 MHz range leads to the characterization of dust particles growth mechanisms: in the same way as in capacitively coupled plasmas, accumulation of nucleus confined near the probe in the magnetic field followed by aggregation takes place. Then, the measure of electrical instabilities on the self-bias voltage allows characterizing the discharge as well as the chemical processes that take place in the magnetic field region and their kinetics. V C 2013 AIP Publishing LLC. [http://dx.

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“…8 This effect is due to secondary electron emission yield, and consequently the equilibrium potential for a dust grain, depending on the diameter of the dust grain as shown by Chow et al 8 Other effects such as differing charge histories 9 or photoemission yields of the dust particles 10 may also contribute to dust charge polarity. In plasmas with opposite polarity dust grains there appear new types of dust plasma waves, 3 in addition to a novel possibility of dust coagulation/agglomeration due to the dust attraction caused by wakefields and focusing 11,12 of positively charged dust grains that stream through the plasma past a negatively charged dust grain.…”

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confidence: 99%

“…11,12 At the equilibrium, we have the charge neutrality condition n i0 ϩZ d1 n d10 ϭn e0 ϩZ d2 n d20 , where n j0 ( jϭe,i,d1,d2 for the electrons, ions, positive and negative dust grains, respectively͒ is the unperturbed particle number density, and Z d1 and Z d2 are, respectively, the number of ions and electrons residing on smaller and larger dust grains. The unperturbed dust charge, for simplicity, is assumed to be constant.…”

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confidence: 99%

Streaming instability in plasmas with opposite polarity grains

2002

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The dust streaming instability in plasmas with opposite polarity grains is analyzed analytically. For this purpose, a dispersion relation is derived by employing a Boltzmann response for the electrons and ions and a hydrodynamic response to positively and negatively charged dust grains that co-exist in an unmagnetized plasma. The dispersion relation admits new instabilities in both collisionless and collisional regimes. The results may have relevance to understanding the origin of electrostatic turbulence in the Earth’s mesosphere, meteor trails, and cometary tails.

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Introduction to Dusty Plasma Physics

Cited by 218 publications

References 0 publications

Potential profile near the virtual cathode in presence of charged dust

Potential profile near the virtual cathode in presence of charged dust

Observation of plasma instabilities related to dust particle growth mechanisms in electron cyclotron resonance plasmas

Streaming instability in plasmas with opposite polarity grains

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