The physical nature of the phenomenon of positive column plasma constriction in low-pressure noble gas direct current discharges

Kurbatov, P F

doi:10.1063/1.4866016

Cited by 7 publications

(4 citation statements)

References 20 publications

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“…In 1928 Townsend revealed that the breakdown voltage U b for a longer gap was higher than that for a shorter gap, even with an equal value of pd [5,11,28,[33][34][35][36], i.e. U b = f (p, d) = f (pd).…”

Section: Similarity In Gas Breakdownmentioning

confidence: 99%

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Experimental study on the similarity of gas discharge in low-pressure Argon gaps

et al. 2022

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Through experiments and theoretical analysis, we investigated the similarity of gas discharge in low-pressure Argon gaps between two plane-parallel electrodes. We found that the breakdown voltages depended not only on gap length and the product of gas pressureand gap length but also on the aspect ratio of the gap, i.e. Ub = f (pd, d/r). When we considered similar discharge gaps, the radius r, gap length d, and gas pressure p fulfilled the conditions of p1 r1 = p2 r2 and p1d1 = p2 d2. In this situation, the reduced field E/p was also constant. The voltage-current characteristic curves of similar gaps were approximately the same, which is a novel experimental result. Comparison of the discharge physical parameters of the scaled-down gap and prototype gap shows that the proportional relations can be derived from the similarity law. Our experimental results provide some instructions on extrapolating two similar gaps and their discharge properties. Application of the similarity law is straightforward when we scale the discharges up or down if they are too small or large.

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Section: Similarity In Gas Breakdownmentioning

confidence: 99%

“…14, art. 140004 (2022) / M. Prijil et al mathematical expression is obtained by the polynomial fit of the profile of the electric field [35,37,38].…”

Section: -3mentioning

confidence: 99%

Experimental study on the similarity of gas discharge in low-pressure Argon gaps

et al. 2022

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“…DC discharges, being one of the most frequently studied systems of gaseous electronics [47], are fairly well understood with a large number of details available in the literature. Nevertheless, these systems are of ongoing interest still today [48][49][50][51][52][53]. It is known that in DC discharges self-excited oscillations may occur over a wide range of frequencies and discharge conditions [54].…”

Section: Striations and Ionization Wavesmentioning

confidence: 99%

Ionization waves in the PK-4 direct current neon discharge

Hartmann

Rosenberg

Juhász

et al. 2020

Plasma Sources Sci. Technol.

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The PK-4 system is a micro-gravity dusty plasma experiment currently in operation on-board the International Space Station. The experiment utilizes a long DC discharge in neon or argon gases. We apply our 2D particle-in-cell with Monte Carlo collisions discharge simulation to compute local plasma parameters that serve as input data for future dust dynamics models. The simulation includes electrons, Ne+ ions, and Ne m metastable atoms in neon gas and their collisions at solid surfaces including secondary electron emission and glass wall charging. On the time scale of the on-board optical imaging, the positive column appears stable and homogeneous. On the other hand, our simulations show that on microsecond time scales the positive column is highly inhomogeneous: ionization waves with phase velocities in the range between 500 m s−1 and 1200 m s−1 dominate the structure. In these waves, the electric field and charged particle densities can reach amplitudes up to 10 times of their average value. Our experiments on ground-based PK-4 replica systems fully support the numerical findings. In the experiment, the direction of the DC current can be alternated, which has been found to favor dust particle chain formation. We discuss possible mechanisms for how the highly oscillatory plasma environment contributes to the dust particle chain formation.

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“…Contraction is one of the most well-known phenomena in gas discharge physics, which is inherent to almost all discharge types (stationary, pulsed, microwave and high-frequency discharges). This phenomenon has attracted the attention of scientists at the early stage of the development of glow discharge physics [1] as well as over the next decades [2][3][4][5][6][7][8][9][10][11][12][13][14][15] and has been actively discussed in literature recently [16][17][18][19][20][21][22][23][24]. Using an inert gas model it is possible to make the farthest progress in the study of contraction phenomenon due to a relative simplicity of physical and chemical processes and the structure of excited terms, which are localized near the ionization potential and have a big gap between the ground state and the first excited state.…”

Section: Introductionmentioning

confidence: 99%

Mutual influence of higher diffusion and radiation modes on the contraction of the positive column discharge

Golubovskiǐ

Siasko

Nekuchaev

2016

Plasma Sources Sci. Technol.

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Fourier analysis of various plasma components in contracted discharge is made by an expansion over diffusion and radiation modes. Resonance atoms transport is traditionally described by an approximation of the effective lifetime by Holstein which considers only a fundamental radiation mode. Proposed method makes it possible to estimate the role of resonance radiation transport quantitatively by comparing the mode spectra. Behavior of resonance atoms successively considered on simple three-level energy models in a linear Shottky theory and in a semi-analytical non-linear diffusion-recombination theory, describing a discharge contraction. Suggested Fourier analysis method has been applied to a detailed model of the DC column contraction in Argon glow discharge. An expansion of different plasma components (electron density, metastable and resonance atoms densities) over the corresponding orthonormal set of diffusion or radiation modes is performed. The comparison of spectra obtained using the traditional Holstein approximation and in case of accurate treatment of resonance radiation transport shows an increase of fundamental diffusion and radiation modes and an effect of higher harmonics suppression in the modes spectra when the resonance radiation transport is described precisely. The role of higher radiation modes in formation of radial profiles of the electron density, metastable and resonance atoms densities as well as current-voltage characteristics is demonstrated by specific examples.

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The physical nature of the phenomenon of positive column plasma constriction in low-pressure noble gas direct current discharges

Cited by 7 publications

References 20 publications

Experimental study on the similarity of gas discharge in low-pressure Argon gaps

Experimental study on the similarity of gas discharge in low-pressure Argon gaps

Ionization waves in the PK-4 direct current neon discharge

Mutual influence of higher diffusion and radiation modes on the contraction of the positive column discharge

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