Elementary processes at the origin of the generation and dynamics of multiple double layers in DP machine plasma

Periodic current bursts observed in the dynamic current-voltage characteristic of a probe in the presence of a plasma fireball in dynamic state were 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 bursts appear in the probe characteristic when a certain relation exists between the fireball dynamics frequency and the frequency of the probe voltage sweep. The double layer dynamics is described by a set of time-dependent Schrödinger-type equations and the self-structuring is given by means of the negative differential resistance. The obtained experimental and theoretical results are proven to be in very good agreement.

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“…We note that a similar linear dependence of the fireball dynamics frequency on the current was earlier reported in Ref. 27. We return to Eqs.…”

Section: B)supporting

confidence: 77%

Experimental and theoretical investigations of a plasma fireball dynamics

Niculescu¹,

Dimitriu²,

Pãun³

et al. 2010

Physics of Plasmas

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“…The experiments were started in the Innsbruck singleplasma machine 19 and followed up in a similar device at UCLA. These are simple dc discharge plasmas between a filamentary cathode and a grounded chamber wall as anode, as schematically shown in Fig.…”

Section: Experiments and Parametersmentioning

confidence: 99%

Neutral gas dynamics in fireballs

Stenzel

Ioniţă

Schrittwieser

2011

Journal of Applied Physics

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Fireballs are local discharge phenomena on positively biased electrodes in partially ionized plasmas. Electrons, energized at a double layer, heat neutral gas which expands. The gas pressure exceeds the plasma pressure, hence becomes important to the stability and transport in fireballs. The flow of gas moves the electrode and sensors similar to a mica pendulum. Flow speed and directions are measured. A fireball gun has been developed to partially collimate the flow of hot gas and heat objects in its path. New applications of fireballs are suggested.

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“…A fireball (a plasma of a ball shape) is often generated near a positively biased electrode in a (usually) low pressure gas. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] The generation of the fireball is believed to be associated with an excitation of a double layer around the fireball, across which part of the discharge voltage drops and in which electrons acquire the energy for ionizing the gas. 1 One would expect the momentum of the particle flow outward of the ball to equal the momentum that the ions acquire while they are accelerated in the double layer.…”

Section: Introductionmentioning

confidence: 99%

The force exerted by a fireball

Makrinich

Fruchtman

2014

Physics of Plasmas

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The force exerted by a fireball was deduced both from the change of the equilibrium position of a pendulum and from the change in the pendulum oscillation period. That measured force was found to be several times larger than the force exerted by the ions accelerated across the double layer that is assumed to surround the fireball. The force enhancement that is expected by ion-neutral collisions in the fireball is evaluated to be too small to explain the measured enhanced force. Gas pressure increase, due to gas heating through electron-neutral collisions, as recently suggested [Stenzel et al., J. Appl. Phys. 109, 113305 (2011)], is examined as the source for the force enhancement. V C 2014 AIP Publishing LLC. [http://dx.

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Elementary processes at the origin of the generation and dynamics of multiple double layers in DP machine plasma

Cited by 57 publications

References 41 publications

Experimental and theoretical investigations of a plasma fireball dynamics

Experimental and theoretical investigations of a plasma fireball dynamics

Neutral gas dynamics in fireballs

The force exerted by a fireball

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