Self-organization of Coulomb balls in glow DC discharge in neon at cryogenic temperature

Polyakov, D. N.; Шумова, В. В.; Vasilyak, L. M.

doi:10.1088/1361-6595/ab2185

Cited by 11 publications

(7 citation statements)

References 55 publications

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“…It follows from this that it is more correct to call these waves recombination waves. It should be noted that metastable states obtained upon oscillation of the electric field were previously observed in plasma with microparticles at cryogenic gas temperature [27]. The ionization waves not only affect the development of dust instabilities, but also cause the formation of stable dust structures similar to the string-like structures observed in the PK-˙4 experiment [61].…”

Section: Stable and Metastable States Of Complex Plasmamentioning

confidence: 60%

“…The value of the voltage drop was then used to determine the average axial electric field. Measurement schemes used in the experiments were described in detail elsewhere [27,48]. Figure 4 Values of the voltage drop corresponding to the image fragments are shown below them.…”

Section: Stable and Metastable States Of Complex Plasmamentioning

confidence: 99%

“…This coefficient indicates how much more heat is released in the discharge plasma without microparticles in comparison with the complex plasma upon maintaining equal ion density. The relative overheating coefficient η Q is useful, first of all, for technologies and processes at low and cryogenic temperatures, when heating is undesirable [24][25][26][27][28]. As was demonstrated in [18], at low discharge currents (I < 1 mA) a gain in the relative heating is quite large (η Q > 10), but it disappears with increasing the discharge current.…”

Section: Introductionmentioning

confidence: 96%

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Ion confinement efficiency and ionization balance in a complex DC discharge plasma

Polyakov¹,

Шумова²,

Vasilyak³

2022

Plasma Sources Sci. Technol.

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We consider the efficiency of an ion confinement inside a cloud of charged microparticles in a low-pressure DC discharge. To describe the ion confinement efficiency in such complex plasma, we propose the indicators calculated taking into account the processes responsible for the generation, the losses, and the accumulation of ions in a cloud of charged microparticles in a plasma using a fluid model. The efficiency of ion accumulation by a microparticle cloud shows the ratio of the average ion densities in discharge with microparticles and without them. The efficiency of ion accumulation by a microparticle shows the difference of average ion densities in a discharge with microparticles and without them, related to microparticle number density. The specific power costs of the existence of one ion in a microparticle cloud determines the linear power costs of the discharge in a cloud related to the linear number of ions in it. The power efficiency of ion accumulation by a microparticle cloud is defined as a ratio of specific power costs in a discharge without microparticles, to specific power costs of ion existence in a cloud. A strong dependence of indicators on the microparticle number density has been revealed. Inefficient conditions of ion confinement inside a cloud are found. Experimental data on dynamic instabilities of a discharge with microparticles was analyzed. It is found that efficiency of ion confinement is connected with dynamic processes in complex plasma. The limiting microparticle number density is shown to serve as the criterion of the occurrence of plasma instability. Exceeding the limiting microparticle number density results, generally, in the development of dynamic instability of complex plasma, and, in inefficient states, in quenching of the discharge.

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Section: Stable and Metastable States Of Complex Plasmamentioning

confidence: 60%

Section: Stable and Metastable States Of Complex Plasmamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Ion confinement efficiency and ionization balance in a complex DC discharge plasma

Polyakov¹,

Шумова²,

Vasilyak³

2022

Plasma Sources Sci. Technol.

Self Cite

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“…This hypothesis was confirmed during an additional experiment carried out at room temperature, which revealed an intense glow near the cone outlet. It is well known that polymer surfaces are easily sputtered in strata of the DC glow discharge [ 47 , 48 ]. Therefore, we can expect rather an efficient sputtering of the cone material because it contains acrylic polymer [ 24 ].…”

Section: Methodsmentioning

confidence: 99%

Dust-Acoustic Nonlinear Waves in a Nanoparticle Fraction of Ultracold (2K) Multicomponent Dusty Plasma

et al. 2021

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The nonlinear dust-acoustic instability in the condensed submicron fraction of dust particles in the low-pressure glow discharge at ultra-low temperatures is experimentally and theoretically investigated. The main discharge parameters are estimated on the basisof the dust-acoustic wave analysis. In particular, the temperature and density of ions, as well as the Debye radius, are determined. It is shown that the ion temperature exceeds the temperature of the neutral gas. The drift characteristics of all plasma fractions are estimated. The reasons for the instability excitation are considered.

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“…Using a suitable arrangement of electrostatic force to counter the downward gravitational force acting on dust particles, one can form various configurations of 2-D 3,4 and 3-D 5,6 dust crystal in the laboratory. Depending on the discharge conditions, the dust system can pass through different phases like crystalline, hexatic, and liquid states 7,8 . The phased nature of the dusty plasma medium can be characterized by the Coulomb coupling parameter 9,10 .…”

Section: Introductionmentioning

confidence: 99%

DPEx-II: A New Dusty Plasma Device Capable of Producing Large Sized DC Coulomb Crystals

Arumugam,

Bandyopadhyay,

Singh

et al. 2021

Preprint

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The creation of a spatially extended stable DC complex plasma crystal is a big experimental challenge and a topical area of research in the field of dusty plasmas. In this paper we describe a newly built and commissioned dusty plasma experimental device, DPEx-II, at the Institute for Plasma Research. The device can support the formation of large sized Coulomb crystals in a DC glow discharge plasma. The plasma in this L-shaped tabletop glass chamber is produced between a circular anode and a long tray shaped cathode. It is characterized with the help of various electrostatic probes over a range of discharge conditions. The dust particles are introduced by a dust dispenser to form a strongly coupled Coulomb crystal in the cathode sheath region. The unique asymmetric electrode configuration minimizes the heating of dust particles and facilitates the formation of crystalline structures with a maximum achievable dimension of 40 cm × 15 cm using this device. A larger crystal has numerous advantages over smaller ones, such as higher structural homogeneity, fewer defects, lower statistical errors due to finite size effects etc. A host of diagnostics tools are provided to characterize the Coulomb crystal. Results of a few initial experiments aimed at demonstrating the technical capabilities of the device and its potential for future dusty plasma research, are reported.

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Self-organization of Coulomb balls in glow DC discharge in neon at cryogenic temperature

Cited by 11 publications

References 55 publications

Ion confinement efficiency and ionization balance in a complex DC discharge plasma

Ion confinement efficiency and ionization balance in a complex DC discharge plasma

Dust-Acoustic Nonlinear Waves in a Nanoparticle Fraction of Ultracold (2K) Multicomponent Dusty Plasma

DPEx-II: A New Dusty Plasma Device Capable of Producing Large Sized DC Coulomb Crystals

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