Theory of Spherical and Cylindrical Langmuir Probes in a Collisionless, Maxwellian Plasma at Rest

Laframboise, J. G.

doi:10.21236/ad0634596

Cited by 351 publications

(373 citation statements)

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“…21, which included particle trapping, was different to the one found in Ref. 5, and they both correspond to the same parameter values.…”

Section: Discussionmentioning

confidence: 71%

“…The thick solid black lines correspond to numerical results of a stationary code (see for instance Ref. 5 or Ref. 22).…”

Section: Electron and Ion Densitiesmentioning

confidence: 99%

“…The steady-state properties of plasma sheaths in non-flowing plasma are now well understood. 1,[3][4][5][6][7] In flowing plasmas, both analytical works in particular regimes 1,[8][9][10] and numerical simulations of the VlasovPoisson system [11][12][13][14] were carried out. Some issues, however, remain open.…”

Section: Introductionmentioning

confidence: 99%

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Direct Vlasov simulations of electron-attracting cylindrical Langmuir probes in flowing plasmas

Sánchez‐Arriaga

Pastor-Moreno

2014

Physics of Plasmas

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Current collection by positively polarized cylindrical Langmuir probes immersed in flowing plasmas is analyzed using a non-stationary direct Vlasov-Poisson code. A detailed description of plasma density spatial structure as a function of the probe-to-plasma relative velocity U is presented. Within the considered parametric domain, the well-known electron density maximum close to the probe is weakly affected by U. However, in the probe wake side, the electron density minimum becomes deeper as U increases and a rarified plasma region appears. Sheath radius is larger at the wake than at the front side. Electron and ion distribution functions show specific features that are the signature of probe motion. In particular, the ion distribution function at the probe front side exhibits a filament with positive radial velocity. It corresponds to a population of rammed ions that were reflected by the electric field close to the positively biased probe. Numerical simulations reveal that two populations of trapped electrons exist: one orbiting around the probe and the other with trajectories confined at the probe front side. The latter helps to neutralize the reflected ions, thus explaining a paradox in past probe theory. V C 2014 AIP Publishing LLC.

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“…21, which included particle trapping, was different to the one found in Ref. 5, and they both correspond to the same parameter values.…”

Section: Discussionmentioning

confidence: 71%

“…The thick solid black lines correspond to numerical results of a stationary code (see for instance Ref. 5 or Ref. 22).…”

Section: Electron and Ion Densitiesmentioning

confidence: 99%

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Direct Vlasov simulations of electron-attracting cylindrical Langmuir probes in flowing plasmas

Sánchez‐Arriaga

Pastor-Moreno

2014

Physics of Plasmas

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“…This means that the relative density fluctuations, n/n, can always be estimated from the relative variation in the probe current, I /I , assuming constant temperature. Using the numerical results of Laframboise (1966) as input to their calculations, Eriksson and Boström (1995) showed that I /I = n/n with a good accuracy, even for Debye lengths as small as the probe radius. In that situation, they found the relative error ( I /I − n/n)/( I /I ) to stay at a level of 0.1 or less for moderate fluctuation amplitudes.…”

Section: The Relative Density Variation N/nmentioning

confidence: 99%

LINDA – the Astrid-2 Langmuir probe instrument

Holback

Jacksén²,

Åhlén

et al. 2001

Ann. Geophys.

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Abstract. The Swedish micro-satellite Astrid-2, designed for studies in magnetosperic physics, was launched into orbit on 10 December 1998 from the Russian cosmodrome Plesetsk. It was injected into a circular orbit at 1000 km and at 83 degrees inclination. The satellite carried, among other instruments, a double Langmuir Probe instrument called LINDA (Langmuir INterferometer and Density instrument for Astrid-2). The scientific goals of this instrument, as well as the technical design and possible modes of operation, are described. LINDA consists of two lightweight deployable boom systems, each carrying a small spherical probe. With these probes, separated by 2.9 meters, and in combination with a high sampling rate, it was possible to discriminate temporal structures (waves) from spatial structures. An onboard memory made it possible to collect data also at times when there was no ground contact. Plasma density and electron temperature data from all magnetic latitudes and for all seasons have been collected.

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“…[16][17][18][19] The impact of relativistic effects using similar methods has been analyzed for a possible Jupiter mission with electrodynamic bare tethers. 20,21 The effects of emission were first investigated by Langmuir for a planar sheath problem, not fully self-consistent but a good approximation for strong double layers.…”

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confidence: 99%

Low work-function thermionic emission and orbital-motion-limited ion collection at bare-tether cathodic contact

Chen

Sanmartin

2015

Phys. Plasmas

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Theory of Spherical and Cylindrical Langmuir Probes in a Collisionless, Maxwellian Plasma at Rest

Cited by 351 publications

References 0 publications

Direct Vlasov simulations of electron-attracting cylindrical Langmuir probes in flowing plasmas

Direct Vlasov simulations of electron-attracting cylindrical Langmuir probes in flowing plasmas

LINDA – the Astrid-2 Langmuir probe instrument

Low work-function thermionic emission and orbital-motion-limited ion collection at bare-tether cathodic contact

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