Digital imaging and analysis of dusty plasmas

Boesse, C.; Henry, Mike; Hyde, Truell; Matthews, L. S.

doi:10.1016/j.asr.2003.02.069

Cited by 20 publications

(16 citation statements)

References 17 publications

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“…The signal generator is coupled to the electrode through an impedance matching network and a variable capacitor attenuator network. The plasma discharge apparatus is described in greater detail in [15], [16]. To measure the sheath thickness accurately is difficult, particularly when dust particles are present.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Relationship Between the DC Bias and the Debye Length in a Complex Plasma

Kong

Carmona-Reyes

Creel

et al. 2007

IEEE Trans. Plasma Sci.

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Abstract-The levitation height of a dust particle layer within a RF discharge plasma sheath is known to be related to the DC bias, the background pressure, and the Debye length. In this paper, a new experimental technique for measurement of the Debye length is introduced. This technique is based on the relationship between an externally applied DC bias and the particle levitation height and shows that under appropriate conditions, the addition of an externally applied DC bias provides a mechanism for evaluation of the Debye length. When compared with existing techniques, this new method appears to be simpler to implement in some cases.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Relationship Between the DC Bias and the Debye Length in a Complex Plasma

Kong

Carmona-Reyes

Creel

et al. 2007

IEEE Trans. Plasma Sci.

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“…The first experiment was performed in the Hypervelocity Impacts and Dusty Plasmas Lab (HIDPL) of the Center for Astrophysics, Space Physics, and Engineering Research (CASPER) at Baylor University, Waco, Texas, while the second series was carried out at the Institute for Solid State Physics and Optics, part of the Wigner Research Centre for Physics, Budapest, Hungary (referenced as "TEX" and "BUD" in the following). Details of the dusty plasma apparatuses and data processing techniques can be found in earlier publications [16,18]. In both cases the dust layer was illuminated by an extended, spatially linearly modulated laser sheath introducing an external force F x (y) = F 0 (y − y 0 ) on every particle, as illustrated in figure 1.…”

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confidence: 99%

Slow Plastic Creep of 2D Dusty Plasma Solids

et al. 2014

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We report complex plasma experiments, assisted by numerical simulations, providing an alternative qualitative link between the macroscopic response of polycrystalline solid matter to small shearing forces and the possible underlying microscopic processes. In the stationary creep regime we have determined the exponents of the shear rate dependence of the shear stress and defect density, being α = 1.15 ± 0.1 and β = 2.4 ± 0.4, respectively. We show that the formation and rapid glide motion of dislocation pairs in the lattice are dominant processes.The direct in situ observation of dynamical processes in bulk condensed matter is not yet available with atomic resolution in both space and time. Femtosecond pumpprobe techniques can resolve atomic motion, atomic force microscopy can detect atoms on surfaces, diffraction methods provide information about the bulk structure, but as long no method can combine all the benefits of these techniques, we are limited to rely of phenomenological models and numerical simulations. Alternative experimental methods have already proven to be helpful for the qualitative understanding of classical collective phenomena. Charged colloids suspended in a liquid environment, and dusty plasmas (solid micron sized particles charged and levitated in gas discharge plasmas) are both interacting many-particle systems that show very similar properties to conventional atomic matter, but at time and distance scales easily and directly accessible with simple video microscopy techniques. Both methods provide insight into the microscopic (particle level) details of different phenomena. Colloid systems are characterized by over-damped dynamics, due to the liquid environment, which makes them well suited for structural and phase transition studies [1], while the weak damping in low pressure gas discharges makes dusty plasmas perfect for studies of wave-dynamics, instabilities, and other collective excitations [2].In material science and metallurgy, creep is the time dependent plastic strain at constant stress and temperature; therefore, it is a special type of plastic deformation of solid matter. In general it is a slow process driven by the thermally activated movement of dislocations (dislocation creep), vacancies (vacancy creep) or diffusion (Nabarro-Herring and Coble creep). The applied stresses are below the rapid yield stress resulting in atomic movements that are crystallographically organized. The applied temperatures are usually above 1 2 T m , where T m is the melting temperature. The time (t) evolution of the deformation (strain ε) at constant stress is often described by one of the empirical formulae(1)where ε 0 is the immediate strain and δ, ϑ and φ are creep coefficients [3]. After a short transient phase ("primary creep"), approximated as logarithmic (∼ δ ln t) or using Andrade's law (∼ ϑt 1/3 ), this describes a steady-state "secondary" creep, dominated by the last term, where the rate φ is determined by the balance of work hardening and thermal softening. Under such circumstances the ste...

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“…This setup is used widely to investigate monolayer dusty plasma physics. [1][2][3][4][5][6][7][8][9][10] Due to the single-particle resolution available, dusty plasmas can be useful for imitating the kinematics of microscopic processes, such as phase transitions, for investigation at the molecular level.…”

Section: Introductionmentioning

confidence: 99%

Interacting multiple model estimators for tracking thousands of interacting, small targets in a complex plasma

et al. 2011

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Tracking a large number of small targets is a challenging task. This work considers tracking approximately 3000 micron-sized particles in a complex plasma. Inter-particle screened-Coulomb interactions increase the complexity of the tracking problem, which is further complicated by highly nonlinear dynamics -a shock wave. Subsets of the particles are tracked concurrently by Interacting Multiple Model estimators, with the results combined off-line. State estimation is performed by an extended Kalman filter. Estimator performance is quantified on synthetic data, with discussion focussing on aspects of the Interacting Multiple Model.

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Digital imaging and analysis of dusty plasmas

Cited by 20 publications

References 17 publications

Relationship Between the DC Bias and the Debye Length in a Complex Plasma

Relationship Between the DC Bias and the Debye Length in a Complex Plasma

Slow Plastic Creep of 2D Dusty Plasma Solids

Interacting multiple model estimators for tracking thousands of interacting, small targets in a complex plasma

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