Double Layer Dynamics in a Collisionless Magnetoplasma

Iizuka, Satoru; Michelsen, Poul; Rasmussen, Jens Juul; Schrittwieser, R.; Hatakeyama, Rikizo; Saeki, Koichi; Sato, Noriyoshi

doi:10.1143/jpsj.54.2516

Cited by 68 publications

(28 citation statements)

References 27 publications

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“…Some of the cyclic processes seen in the simulations have also been seen in laboratory experiments (Iizuka et al, 1983(Iizuka et al, , 1985. These experiments were carried out in a Q machine with both single-and double-ended operations.…”

Section: Applied Potential Dropmentioning

confidence: 58%

“…Thus, the application of a potential drop across a collisionless plasma may drive a double layer along with a host of other plasma processes (Singh and Schunk, 1982a). There are several laboratory experiments (Coakley and Hershkowitz, 1979;Iizuka et al, 1983Iizuka et al, , 1985 and numerical simulations (Joyce and Hubbard, 1978;Singh, 1980Singh, , 1982Singh and Thiemann, 1980a,b;Singh andSchunk, 1982a,c, 1983a;Johnson, 1980) in which DL'shave been driven by applied potential drops. Some of these experiments and simulations (Singh, 1982;Singh andSchunk, 1982a, 1983a) show remarkable similarities in both the processes leading to the formation of a DL and its dynamics.…”

Section: Applied Potential Dropmentioning

confidence: 99%

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Electric fields and double layers in plasmas

1987

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Various mechanisms for driving double layers in plasmas are briefly described, including applied potential drops, currents, contact potentials, and plasma expansions. Some dynamical features of the double layers are discussed. These features, as seen in simulations, laboratory experiments, and theory, indicate that double layers and the currents through them undergo slow oscillations which are determined by the ion transit time across an effective length of the system in which the double layers form. It is shown that a localized potential dip forms at the low potential end of a double layer, which interrupts the electron current through it according to the Langmuir criterion, whenever the ion flux into the double is disrupted. The generation of electric fields perpendicular to the ambient magnetic field by contact potentials is also discussed. Two different situations have been considered; in one, a low-density hot plasma is sandwiched between high-density cold plasmas, while in the other a high-density current sheet permeates a low-density background plasma. Perpendicular electric fields develop near the contact surfaces. In the case of the current sheet, the creation of parallel electric fields and the formation of double layers are also discussed when the current sheet thickness is varied. Finally, the generation of electric fields (parallel to an ambient magnetic field) and double layers in an expanding plasmas is discussed.

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Section: Applied Potential Dropmentioning

confidence: 58%

Section: Applied Potential Dropmentioning

confidence: 99%

Electric fields and double layers in plasmas

1987

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“…The potential structure is created at L z 10 cm from the electrode. Following IIZUKA et al [2,24] we assume that the velocity of the travelling potential structure u, can be written as u,=ac,. Electron temperature in our plasma machine is kT, 2 2 eV so that for argon ions we have c, = (mi z 2500 m/s.…”

Section: Discussionmentioning

confidence: 99%

Experimental Analysis of a Low Frequency Instability in a Magnetized Discharge Plasma

Gyergyek

Čerček

Jelić

et al. 1993

Contrib. Plasma Phys.

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In the paper we present the results of an investigation of a low frequency (3G100 kHz) instability in a weakly magnetized discharge plasma. The instability is triggered by a disc electrode which terminates the magnetized plasma column and is biased above the plasma potential. Frequency dependence on various parameters, e.g. electrode diameter, electrode bias, neutral gas pressure and plasma density is measured. Space and time dependence of the plasma potential and density in the perturbed region during one period of the electrode current oscillation are measured. During the phase of the current decrease a potential structure moves in axial direction from the edge of the perturbed region towards the electrode. During the phase of current saturation the motion of ions is mostly radial. The observed phenomenon is approximately modeled as a two dimensional potential relaxation instability (PRI).

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“…In dc discharges, especially in neon, moving and standing striations, potential relaxation instability etc. [16,18,30] can be developed.…”

Section: Numerical Procedures For Obtaining the Eedfmentioning

confidence: 99%

“…Numerical processing of the probe data (smoothing and differentiation procedures) is necessary to obtain the EEDF. The plasma instabilities [16][17][18] and fluctuations in the discharges are significant source of noise. Even a very small noise in the probe current can result in distortions of the shape of EEDF due to noise-amplification effect of the differentiation process [5,15,19].…”

Section: Introductionmentioning

confidence: 99%

EEDF Determination by Numerical Processing of the Probe Data in Neon DC Discharge

Djermanova

Kiss’ovski

Tsankov

2006

Contrib. Plasma Phys.

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Numerical processing of the data from single probe measurements allows determination of the electron energy distribution function (EEDF) from the second derivative of the probe current. The current-voltage probe characteristics are measured by acquisition system for further smoothing and differentiation. The developed procedure is a combination of the Savitzky-Golay (S-G) smoothing filter and three-point differentiator with varying step. The above methods are modified for irregularly sampled data which enables more accurate determination of EEDF. Advantages of this approach are data smoothing with minimum information loss and improved noise reduction at the differentiation procedure. The procedure is applied for EEDF calculation in low current low pressure neon discharge. The shape of EEDF shows deviation from both Maxwellian and Druyvesteyn distributions.

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Double Layer Dynamics in a Collisionless Magnetoplasma

Cited by 68 publications

References 27 publications

Electric fields and double layers in plasmas

Electric fields and double layers in plasmas

Experimental Analysis of a Low Frequency Instability in a Magnetized Discharge Plasma

EEDF Determination by Numerical Processing of the Probe Data in Neon DC Discharge

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