Strong laboratory double layers in the presence of a magnetic field

Coakley, Peter; Johnson, Lloyd E.; Hershkowitz, N.

doi:10.1016/0375-9601(79)90353-0

Cited by 31 publications

(6 citation statements)

References 7 publications

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“…The present paper is the first to report on spatially resolved non-invasive measurements of supersonic ion flows created in helicon-wave-heated plasmas without the use of accelerator or auxiliary-heating techniques. These studies include the parameter range ω pe /ω ce ≥ 1 in which double layers are uncommon 20 and also explore ranges of magnetic-field gradients and mirror ratios which might inhibit flow.…”

Section: Introductionmentioning

confidence: 99%

Ion acceleration in plasmas emerging from a helicon-heated magnetic-mirror device

et al. 2003

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Using laser-induced fluorescence, measurements have been made of metastable argon-ion, Ar + * (3d 4 F 7/2 ), velocity distributions on the major axis of an axisymmetric magnetic-mirror device whose plasma is sustained by helicon wave absorption. Within the mirror, these ions have sub-eV temperature and, at most, a subthermal axial drift. In the region outside the mirror coils, conditions are found where these ions have a field-parallel velocity above the acoustic speed, to an axial energy of ∼ 30 eV, while the field-parallel ion temperature remains low. The supersonic Ar + * (3d 4 F 7/2 ) are accelerated to one-third of their final energy within a short region in the plasma column, ≤ 1 cm, and continue to accelerate over the next 5 cm. Neutralgas density strongly affects the supersonic Ar + * (3d 4 F 7/2 ) density.

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Section: Introductionmentioning

confidence: 99%

Ion acceleration in plasmas emerging from a helicon-heated magnetic-mirror device

et al. 2003

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“…They conclude that weak density depressions in current‐carrying plasma can develop an electrostatic potential structure, i.e., a strong double layer that is responsible for turbulent fluctuations adjacent to it by inducing a two‐stream instability that nonlinearly evolves into electron phase space holes. They reinforce their interpretation by citing laboratory experiments on double layers [ Coakley et al , 1979; Leung et al , 1980] and electron phase space holes [ Saeki et al , 1979]. Kintner et al [2000a], while discussing Polar satellite observations of electron phase space holes, also cites Saeki et al [1979], who observed these spatially localized and velocity‐space‐localized depletions in the electron distribution function.…”

Section: Laboratory Results Cited By Space Researchersmentioning

confidence: 85%

“…Starting with the earliest papers containing Alfvén 's [1958] conjectures of double layers in space, supporting laboratory results [ Langmuir , 1929] have been cited. Early reports of quasi‐static, space electric fields [ Mozer et al , 1977; Temerin et al , 1981; Mozer and Kletzing , 1998], documenting the presence of double layers in the auroral region, cite the review by Block [1972] and many laboratory double‐layer papers [ Quon and Wong , 1976; Torvén and Andersson , 1979; Coakley et al , 1979; Leung et al , 1980; Hollenstein et al , 1980; Hershkowitz et al , 1981].…”

Section: Laboratory Results Cited By Space Researchersmentioning

confidence: 99%

“… Temerin et al [1979], in reporting S3‐3 satellite observations of electrostatic ion‐cyclotron waves, cite D'Angelo and Motley [1962] in establishing the wave as one of the low‐frequency eigenmodes of a magnetized plasma. Later, Temerin et al [1982] cites a host of laboratory double‐layer experiments [ Quon and Wong , 1976; Torvén and Andersson , 1979; Coakley et al , 1979; Hollenstein et al , 1980; Leung et al , 1980; Hershkowitz et al , 1981] when reporting the discovery of double layers in space. Newman et al [2001, 2002] interpret space data using kinetic one‐dimensional simulations.…”

Section: Laboratory Results Cited By Space Researchersmentioning

confidence: 99%

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Interrelated laboratory and space plasma experiments

Koepke

2008

Reviews of Geophysics

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[1] Many advances in understanding space plasma phenomena have been linked to insight derived from theoretical modeling and/or laboratory experiments. Advances for which laboratory experiments played an important role are reviewed here. How the interpretation of the space plasma data was influenced by one or more laboratory experiments is described. The space physics motivation of laboratory investigations and the scaling of laboratory plasma parameters to space plasma conditions are discussed. Examples demonstrating how laboratory experiments develop physical insight, validate or invalidate theoretical models, discover unexpected behavior, establish observational signatures, and pioneer diagnostic methods for the space community are presented. The various device configurations found in space-related laboratory investigations are outlined. A primary objective of this review is to articulate the overlapping scientific issues that are addressable in space and laboratory experiments. A secondary objective is to convey the wide range of laboratory and space plasma experiments involved in this interdisciplinary alliance. Over time the degree to which the interrelated experiments can be compared has increased, thanks to improved diagnostic techniques in space and closer attention to matching dimensionless space parameters in the laboratory.

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“…More specifically, this work includes the first laboratory observations of ion-acoustic-type DL's [18], slow ion acoustic DL's [20] [12], and U-shaped DL's in a magnetic field in a triple plasma device [8]. It should be noted that all our DL's have been produced in triple plasma devices [9] and that with the exception of the DL's described in [lo], [18], and [20], these DL's have been stationary. For a review of many of these, as well as other DL experiments, the reader is referred to Hershkowitz [23].…”

Section: Introductionmentioning

confidence: 99%