Numerical simulations on ion acoustic double layers

Sato, Toru; Okuda, H.

doi:10.1029/ja086ia05p03357

Cited by 154 publications

(43 citation statements)

References 26 publications

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“…The influx of current into the magnetic field flux tubes must be balanced by that across the magnetic field. If there is to be a net current out of the simulation, then, to be totally self-consistent, one needs to treat it as part of a circuit as did Sato and Okuda [37]. For discussion see Reference [43].…”

Section: Resultsmentioning

confidence: 99%

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Particle simulation of auroral double layers

Smith

Okuda

1987

Laser Part. Beams

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Section: Resultsmentioning

confidence: 99%

“…In their support simulations by Wagner showed double-layers to develop in the presence of just a current sheet [51]. Sato and Okuda [36,37] performed a series of simulations using even "more realistic" conditions. Their model ( Fig.…”

Section: )mentioning

confidence: 99%

Particle simulation of auroral double layers

Smith

Okuda

1987

Laser Part. Beams

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“…The basic mechanism which produces weak ion-acoustic double layers is a current interruption caused by a negative potential spike. This fact was primarily recognized in onedimensional periodic simulations (Sato and Okuda, 1981 ;Kindel et al, 1981 ;Hasegawa and Sato, 1982;Nishihara et al, 1982;Chanteur et al, 1983) and has been recently confirmed in the two-dimensional case with a strong magnetic field and under various boundary conditions (Barnes et al, 1985). The theoretical explanation given to the appearance and the growth of a double layer (Hasegawa and Sato, 1982;Nishihara et al, 1982;Chanteur et al, 1983;Chanteur, 1984) turns out to be more or less independent of the linear instability.…”

Section: Introductionmentioning

confidence: 97%

Current driven weak double layers

Chanteur¹

1987

Laser Part. Beams

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Double layers in plasmas can be created by different means. For example, a potential difference forms between two plasmas with different temperatures (Hultqvist, 1971;Ishiguro et al., 1985), in a plasma jet flowing along a converging magnetic field (Serizawa and Sato, 1984), in a quiescent plasma submitted to an external difference of potential, or in a turbulent plasma carrying an electric current. The first three cases can be current-free, but not necessarily, although the numerical simulations have been made under such conditions for the first two points (Ishiguro et al., 1985;Serizawa and Sato, 1984). Apart from the third case, which is mainly of interest for laboratory experiments, these double layers are good candidates for accelerating the auroral electrons to the few kiloelectron volts observed.

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“…It is not known whether this effect is due to the under-resolution of the aperture itself (and its fields) or of the ion acoustic mode wavelength near the aperture. Ion acoustic double layers have been reported [17,20] to form a dip in φ and n p on the low potential side, and such dips are regularly revealed in MNX simulations and experiments. Some additional discussion on the possible role of IAWs is provided in Sec.…”

Section: Steady-state Plasma and Double Layer Profilesmentioning

confidence: 99%

Particle-in-cell modeling of magnetized argon plasma flow through small mechanical apertures

Sefkow

Cohen

2009

Physics of Plasmas

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Motivated by observations of supersonic argon-ion flow generated by linear helicon-heated plasma devices, a three-dimensional particle-in-cell (PIC) code is used to study whether stationary electrostatic layers form near mechanical apertures intersecting the flow of magnetized plasma. By self-consistently evaluating the temporal evolution of the plasma in the vicinity of the aperture, the PIC simulations characterize the roles of the imposed aperture and applied magnetic field on ion acceleration. The PIC model includes ionization of a background neutral-argon population by thermal and superthermal electrons, the latter found upstream of the aperture. Near the aperture, a transition from a collisional to a collisionless regime occurs. Perturbations of density and potential, with mm wavelengths and consistent with ion acoustic waves, propagate axially. An ion acceleration region of length ∼ 200 − 300 λD,e forms at the location of the aperture and is found to be an electrostatic double layer, with axially-separated regions of net positive and negative charge. Reducing the aperture diameter or increasing its length increases the double layer strength.

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Numerical simulations on ion acoustic double layers

Abstract: A comprehensive numerical study of ion acoustic double layers has been performeu for both periodic as well as for nonperiodic systems by means of one-dimensional particle

Cited by 154 publications

References 26 publications

Particle simulation of auroral double layers

Particle simulation of auroral double layers

Current driven weak double layers

Particle-in-cell modeling of magnetized argon plasma flow through small mechanical apertures

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