Self-excited dust-acoustic waves in an electron-depleted nanodusty plasma

Tadsen, Benjamin; Greiner, Franko; Groth, Sebastian; Piel, A.

doi:10.1063/1.4934927

Cited by 59 publications

(75 citation statements)

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“…A dimensionless parameter, which is called Havnes parameter [50,51] P h = Z d n d /n i decides the density of free electrons in a dusty plasma. It has been discussed that dust grains absorb free electrons and reduce the density of free electrons in a plasma.…”

Section: Discussionmentioning

confidence: 99%

“…It has been discussed that dust grains absorb free electrons and reduce the density of free electrons in a plasma. A dimensionless parameter, which is called Havnes parameter [50,51] P h = Z d n d /n i decides the density of free electrons in a dusty plasma. It has been assumed that plasma parameters are not strongly affected by the dust grains if P h < 1 and plasma parameters can be used to estimate the dusty plasma parameters.…”

Section: Discussionmentioning

confidence: 99%

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Influence of external magnetic field on dust acoustic waves in a capacitive RF discharge

Choudhary

Bergert²,

Mitic³

et al. 2019

Contributions to Plasma Physics

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This paper reports experiments on self-excited dust acoustic waves (DAWs) andits propagation characteristics in a magnetized rf discharge plasma. The DAWs are spontaneously excited in dusty plasma after adding more particles in the confining potential well and found to propagate in the direction of streaming ions. The spontaneous excitation of such low-frequency modes is possible due to the instabilities associated with streaming ions through the dust grain medium. The background E-field and neutral pressure determine the stability of excited DAWs. The characteristics of DAWs strongly depend on the strength of external magnetic field. The magnetic field of strength B < 0.05 T only modifies the characteristics of propagating waves in dusty plasma at moderate power and pressure, P = 3.5 W and p = 27 Pa, respectively. It is found that DAWs start to be damped with increasing the magnetic field beyond B > 0.05 T and get completely damped at higher magnetic field B ∼ 0.13 T. After lowering the power and pressure to 3 W and 23 Pa respectively, the excited DAWs in the absence of B are slightly unstable. In this case, the magnetic field only stabilizes and modifies the propagation characteristics of DAWs while the strength of B is increased up to 0.1 T or even higher. The modification of the sheath electric field where particles are confined in the presence of the external magnetic field is the main cause of the modification and damping of the DAWs in a magnetized rf discharge plasma. K E Y W O R D Sdust acoustic wave, magnetized dusty plasma, magnetized plasma, RF discharge, superconducting magnet 1The presence of submicron to micrometre-sized particles in a plasma makes it more complex because these particles alter the dynamics of the plasma species (electrons and ions) as well as they exhibit their own dynamics. Such medium, which consists of three charged species namely electrons, ions, and charged solid particles, is termed as a dusty plasma or complex plasma. In the background of a low-temperature plasma, energetic electrons impinge on the surface of the solid particle and charge their surface negatively up to 10 3 -10 5 times of an electron charge [1] to balance the fluxes of electrons and ions. After the density of negatively charged dust particles crosses a critical value, then long-range coulombic interaction among the dust particles turnsThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Influence of external magnetic field on dust acoustic waves in a capacitive RF discharge

Choudhary

Bergert²,

Mitic³

et al. 2019

Contributions to Plasma Physics

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“…[1] Since the initial prediction [2] and experimental observation [3] of this wave mode, the dust acoustic wave has been the subject of intense experimental and theoretical study owing in part to the fact that the large particle size and long characteristic time scales of the dust component (with characteristic frequencies in tens of Hz) make this system relatively easy to access experimentally and allows for the study of the wave's properties at both the global and individual particle level with incredible spatial resolution. [4][5][6] In the laboratory setting, the wave that is typically observed is nonlinear and simultaneously supports a number of wave modes. The nonlinear nature of the wave modes that are observed in the laboratory allow one to apply an external modulation and preferentially excite a single wave mode, as seen in Figure 1 where one sees the the frequency spectrum that is experimentally observed plotted as a function of the frequency of an externally applied modulation.…”

Section: Introductionmentioning

confidence: 99%

Volumetric measurement of synchronization of the dust acoustic wave with an external modulation

Williams

2018

AIP Conference Proceedings

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“…The number density of particles is constant and assumed to be n = α × 4.6 × 10 13 m −3 . For α = 1 this corresponds to the experimental situation we want to compare with [17]. We vary the number density scale parameter α between 0.06 and 6 to simulate dust clouds with different optical depths τ .…”

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confidence: 99%

“…The nanodust is produced in a cylindrical plasma chamber by means of an RF driven capacitively coupled, parallel plate reactor at typical 10 W@13.56 MHz and an argon pressure of typical 20 Pa. For details of the experimental setup see [17]. Kinetic Mie ellipsometry is used to get information about size and density of the dust [10].…”

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confidence: 99%

In-situ analysis of optically thick nanoparticle clouds

Kirchschlager

Wolf

Greiner

et al. 2017

Applied Physics Letters

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Nanoparticles grown in reactive plasmas and nanodusty plasmas gain high interest from basic science and technology. One of the great challenges of nanodusty plasmas is the in-situ diagnostic of the nanoparticle size and refractive index. The analysis of scattered light by means of the Mie solution of the Maxwell equations was proposed and used as an in-situ size diagnostic during the past two decades. Today, imaging ellipsometry techniques and the investigation of dense, i. e. optically thick nanoparticle clouds demand for analysis methods to take multiple scattering into account. We present the first 3D Monte-Carlo polarized radiative transfer simulations of the scattered light in a dense nanodusty plasma. This technique extends the existing diagnostic methods for the in-situ analysis of the properties of nanoparticles to systems where multiple scattering can not be neglected.

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Self-excited dust-acoustic waves in an electron-depleted nanodusty plasma

Cited by 59 publications

References 50 publications

Influence of external magnetic field on dust acoustic waves in a capacitive RF discharge

Influence of external magnetic field on dust acoustic waves in a capacitive RF discharge

Volumetric measurement of synchronization of the dust acoustic wave with an external modulation

In-situ analysis of optically thick nanoparticle clouds

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