Multiple double layers in a glow discharge

Conde, Luis; León, Ángel Dámaso Luis

doi:10.1063/1.870572

Cited by 64 publications

(37 citation statements)

References 28 publications

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“…They are employed to measure the space dependent properties of plasma plumes produced by ion thrusters or the plasma potential profile of double layers [6]. Their spatial resolutions is essentially limited by the plasma Debye length λ D and physical size of the probe d and they are usually employed when λ D /d…”

Section: Introductionmentioning

confidence: 99%

Measurements of Plasma Properties Using Fast Sweep Langmuir Probes in Unmagnetized Weakly Ionized Plasmas

Troll

Conde

Criado

et al. 2010

Contrib. Plasma Phys.

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The performances of a simple circuit for fast sweep measurements using collecting and emissive Langmuir probes are evaluated. The probes are biased by means of a time dependent ramp voltage signal with a variable pulse frequency and the current voltage curves are measured along the increasing flange of this sawtooth voltage. The response of this fast probe polarization circuit was verified under actual experimental conditions by measuring the properties of a stationary Maxwellian plasma produced by means of a glow discharge. The results are independent of the experimental conditions and essentially rely on the discharge properties for polarization pulse repetition rates below a threshold. This upper bound lies below the ion plasma frequency and is related with the faster time scale involved in the sawtooth signal probe bias voltage. The motion of ions would not follow the rapid change of the electric field around the probe associated to the short decreasing edge of the sawtooth polarization voltage and, therefore, the probe perturbs the local electric field. We conclude that these time scales should be considered for the interpretation of these measurements in addition to the electron and ion plasma frequencies in fast sweep Langmuir probe techniques. We conclude that these time scales should be considered for the interpretation of these measurements in addition to the electron and ion plasma frequencies in fast Langmuir probe techniques.

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Section: Introductionmentioning

confidence: 99%

Measurements of Plasma Properties Using Fast Sweep Langmuir Probes in Unmagnetized Weakly Ionized Plasmas

Troll

Conde

Criado

et al. 2010

Contrib. Plasma Phys.

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“…Laboratory experiments and space tests [1][2][3][4][5] with hollowcathode based plasma contactors suggest that external ionization of neutral gas can have a leading role in determining their current-voltage (C-V) response, in particular, in the so-called ignited regime. This regime is characterized by ͑i͒ a C-V characteristic with a strong enhancement of the electrical current at a nearly constant contactor voltage, and ͑ii͒ a plasma structure consisting of a glowing plasma plume ͑or core͒ around the contactor, separated by a space-charge sheath, the double layer ͑DL͒, from the background plasma ͑or presheath͒.…”

Section: Introductionmentioning

confidence: 99%

Current–voltage response of anodic plasma contactors with external ionization

Ahedo

1996

Physics of Plasmas

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A spherical, steady-state model that considers the combined influence of plasma emission and external ionization of neutral gas on the operation of electron-collecting contactors is presented. Ionization by both Maxwellian and streaming electrons is investigated. A core ͑or quasineutral cloud͒ and a no-core mode are considered and the transition conditions from one to another are derived. The collected current is determined in terms of the main plasma and contactor parameters. The current-voltage response reproduces the ignited regime observed in experiments. The transition to the ignited regime and the transition to the core mode are not equivalent. It is shown that ionization by the electron beam is the main driver of ignition. The Langmuir law for the double layer causes a self-regulation of the core that affects the collection of current and leads to a multiplicity of solutions. Different neutral gas profiles are analyzed. It is uncertain whether ignition is reached when the neutral gas is provided by the contactor exclusively. The appearance of nonmonotonic potential profiles for low plasma emissions is noted.

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“…M ULTIPLE double layers are complex nonlinear potential structures in plasma, consisting of two or more subsequent double layers [1]- [4]. It appears as several bright and concentric plasma shells attached to the anode of a glow discharge or to a positively biased electrode that is immersed into plasma.…”

mentioning

confidence: 99%

“…It appears as several bright and concentric plasma shells attached to the anode of a glow discharge or to a positively biased electrode that is immersed into plasma. The axial profile of the plasma potential has a stair steps shape, with potential jumps close to the ionization potential of the used gas [1], [3]. At high values of the potential applied to the anode (or the supplementary electrode), the multiple double layers evolve into a dynamic state, consisting of periodic disruptions and reaggregations of the constituent double layers [3].…”

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confidence: 99%

Experimental and Modeling Results on Multiple Double Layers in Low-Temperature Discharge Plasma

Dimitriu

Aflori²,

Ivan

et al. 2011

IEEE Trans. Plasma Sci.

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Multiple double layers were experimentally investigated in low-temperature plasma and modeled in the frame of the scale relativity model, based on both the fractal space-time concept and the generalization of Einstein's principle of relativity to scale transformations. The obtained results are in very good agreement, proving the ability of the multiple double layers to locally increase the plasma density and to accelerate the charged particles (electrons and ions). Index Terms-Fractal, multiple double layers, scale relativity.

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Multiple double layers in a glow discharge

Cited by 64 publications

References 28 publications

Measurements of Plasma Properties Using Fast Sweep Langmuir Probes in Unmagnetized Weakly Ionized Plasmas

Measurements of Plasma Properties Using Fast Sweep Langmuir Probes in Unmagnetized Weakly Ionized Plasmas

Current–voltage response of anodic plasma contactors with external ionization

Experimental and Modeling Results on Multiple Double Layers in Low-Temperature Discharge Plasma

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