Common physical mechanism for concentric and non-concentric multiple double layers in plasma

Dimitriu, Dan Gheorghe; Aflori, Magdalena; Ivan, L. M.; Ioniţă, C.; Schrittwieser, R.

doi:10.1088/0741-3335/49/3/004

Cited by 43 publications

(32 citation statements)

References 22 publications

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“…At high values of the potential applied on the electrode, the structure passes into a dynamic state, consisting of periodic disruptions and reaggregations of the double layer at its border. 2,4 When the double layer disrupts, the initially trapped particles ͑electrons and positive ions͒ are released into plasma, triggering different types of instabilities such as ion-acoustic instability ͑in nonmagnetized plasmas͒ 5 or potential relaxation instability and electrostatic ion-cyclotron instability ͑in magnetized plasma͒. 6 The complex dynamical systems, and particularly the plasma, which display chaotic behavior are recognized to acquire self-similarity and manifest strong fluctuations of all possible scales ͑for details see Refs.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical investigations of a plasma fireball dynamics

Niculescu¹,

Dimitriu²,

Pãun³

et al. 2010

Physics of Plasmas

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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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Section: Introductionmentioning

confidence: 99%

Experimental and theoretical investigations of a plasma fireball dynamics

Niculescu¹,

Dimitriu²,

Pãun³

et al. 2010

Physics of Plasmas

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“…3͒ and is somewhat similar to other plasma balls excited near a positive electrode. 10,11 The discharge in the absence of a magnetic field will be described in another paper. In this paper we do not investigate the operation of the RPS when the magnetic field is zero.…”

Section: A Plasma Sourcementioning

confidence: 99%

Experimental study of a radial plasma source

Makrinich

Fruchtman

2009

Physics of Plasmas

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A radially outward acceleration of plasma in cylindrical geometry along an applied electric field and across an axial magnetic field is studied. The configuration, coined a radial plasma source, consists of two ceramic disks positioned parallel to each other, between which a cylindrical molybdenum anode is mounted. The electric field is generated by applying a voltage between the anode and a heated cathode neutralizer that is located away from the ceramic disks. The plasma diagnostic system includes Langmuir probes, an emissive probe, and a balance force meter. The discharge voltage is found to increase when the magnetic field is increased or when the mass flow rate (and the pressure) is decreased. For a discharge current of 1.4 A, the discharge voltage increases from 55 to 120 V when the magnetic field is increased from 0 to 186 G. The azimuthal uniformity of the plasma flow is found to decrease with the increase in gas pressure. The force exerted on the balance force meter is found to be larger than the force exerted by the plasma flow. This disparity indicates that a considerable part of the force is exerted by the neutral gas, which has gained momentum from the plasma via ion-neutral collisions. The force is increased because the momentum delivered for a given deposited power is larger if the energy is deposited in a larger mass, as happens here through plasma collisions. We estimate theoretically the expected force at the collisionless and the collisional limits and find that the measured force is between the expected forces at the two limits.

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“…These instabilities imply both chaos through different routes (intermittencies, quasi-periodicity, cascade of period-doubling bifurcations, sub-harmonic bifurcations, torus breakdown) and self-structuring through the generation of complex structures [3][4][5]. According to the classical concepts, all theoretical complex systems models (fluid models, kinetic models, etc.)…”

Section: Introductionmentioning

confidence: 99%

Fractal Information by Means of Harmonic Mappings and Some Physical Implications

Agop

Gavriluţ

Pãun

et al. 2016

Entropy

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Abstract:Considering that the motions of the complex system structural units take place on continuous, but non-differentiable curves, in the frame of the extended scale relativity model (in its Schrödinger-type variant), it is proven that the imaginary part of a scalar potential of velocities can be correlated with the fractal information and, implicitly, with a tensor of "tensions", which is fundamental in the construction of the constitutive laws of material. In this way, a specific differential geometry based on a Poincaré-type metric of the Lobachevsky plane (which is invariant to the homographic group of transformations) and also a specific variational principle (whose field equations represent an harmonic map from the usual space into the Lobachevsky plane) are generated. Moreover, fractal information (which is made explicit at any scale resolution) is produced, so that the field variables define a gravitational field. This latter situation is specific to a variational principle in the sense of Matzner-Misner and to certain Ernst-type field equations, the fractal information being contained in the material structure and, thus, in its own space associated with it.

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Common physical mechanism for concentric and non-concentric multiple double layers in plasma

Cited by 43 publications

References 22 publications

Experimental and theoretical investigations of a plasma fireball dynamics

Experimental and theoretical investigations of a plasma fireball dynamics

Experimental study of a radial plasma source

Fractal Information by Means of Harmonic Mappings and Some Physical Implications

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