Collisionless Drift Waves Ranging from Current‐Driven, Shear‐Modified, and Electron‐Temperature‐Gradient Modes

Hatakeyama, Rikizo; Moon, Chanho; Tamura, S.; Kaneko, Toshiro

doi:10.1002/ctpp.201010156

Cited by 6 publications

(5 citation statements)

References 16 publications

(25 reference statements)

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“…The k 2 multiplier in the integrand ensures that the contribution from the large non-universal scales is suppressed. For k > 1/η we find the dissipation subrange, which in the classical Heisenberg analysis (Heisenberg, 1948;Chandrasekhar, 1949) is found to decrease like k −7 . This particular results seems to agree well with some observations but is nonetheless suspect since it predicts that higher-order velocity derivatives (∇ j u) 2 = ∞ 0 k 2j S(k)dk should be divergent for some large j .…”

Section: Models For Strong Turbulence In Fluids and Plasmasmentioning

confidence: 62%

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Spectral properties of electrostatic drift wave turbulence in the laboratory and the ionosphere

Pécseli

2015

Ann. Geophys.

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Abstract. Low-frequency electrostatic drift wave turbulence has been studied in both laboratory plasmas and in space. The present review describes a number of such laboratory experiments together with results obtained by instrumented spacecraft in the Earth's near and distant ionospheres. The summary emphasizes readily measurable quantities, such as the turbulent power spectra for the fluctuations in plasma density, potential and electric fields. The agreement between power spectra measured in the laboratory and in space seems to be acceptable, but there are sufficiently frequent counterexamples to justify a future dedicated analysis, for instance by numerical tools, to explain deviations. When interpreting spectra at low ionospheric altitudes, it is necessary to give attention to the DC ionospheric electric fields and the differences in the physics of electron-ion collisions and collisions of charged particles with neutrals for cases with significant Hall drifts. These effects modify the drift wave spectra. A dedicated laboratory experiment accounted for some of these differences.

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Section: Models For Strong Turbulence In Fluids and Plasmasmentioning

confidence: 62%

“…Enhanced growth rates of drift wave instabilities can be found with field-aligned currents (Hatakeyama et al, 1980(Hatakeyama et al, , 2011Garcia and Pécseli, 2013): in these cases the restriction on mean free paths is of minor consequence.…”

Section: Resistive Drift Waves With Ion-electron Collisionsmentioning

confidence: 99%

Spectral properties of electrostatic drift wave turbulence in the laboratory and the ionosphere

Pécseli

2015

Ann. Geophys.

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“…In this kinetic model, is replacing the assumption of Boltzmann‐distributed electrons. In, for instance, laboratory experiments, it has been demonstrated that drift waves can be made unstable by currents along the magnetic field lines [ Hatakeyama et al , ]. To estimate the growth rate under the present conditions, we again assume quasi‐neutrality n e ≈ n i = n and combine and to get

\frac{ω^{*}}{ω} - C_{s}^{2} ((), \frac{k_{⟂}^{2}}{{normalΩ}_{ci}^{2}} - \frac{k_{z}^{2}}{ω^{2}}) + i \frac{k_{z} g}{ω^{2}} = 1 + \frac{ω - U k_{z} - ω^{*}}{k_{z} u_{T_{e}}} Z ((), \frac{ω - U k_{z}}{k_{z} u_{T_{e}}}) .

…”

Section: Drift Wave Instabilitymentioning

confidence: 99%

Models for electrostatic drift waves with density variations along magnetic field lines

Garcia

Pécseli

2013

Geophysical Research Letters

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[1] Drift waves with vertical magnetic fields in gravitational ionospheres are considered where the unperturbed plasma density is enhanced in a magnetic flux tube. The gravitational field gives rise to an overall decrease of plasma density for increasing altitude. Simple models predict that drift waves with finite vertical wave vector components can increase in amplitude merely due to a conservation of energy density flux of the waves. Field-aligned currents are some of the mechanisms that can give rise to fluctuations that are truly unstable. We suggest a self-consistent generator or "battery" mechanism that in the polar ionospheres can give rise to magnetic field-aligned currents even in the absence of electron precipitation. The free energy here is supplied by steady state electric fields imposed in the direction perpendicular to the magnetic field in the collisional lower parts of the ionosphere or by neutral winds that have similar effects.Citation: Garcia, O. E., and H. L. Pécseli (2013), Models for electrostatic drift waves with density variations along magnetic field lines, Geophys. Res. Lett., 40,[5565][5566][5567][5568][5569]

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“…First, a novel method to control plasma structures, such as electron temperature gradient (ETG) [1] in magnetized non-equilibrium plasmas, has been developed for understanding and controlling anomalous plasma heat transport to improve plasma confinement [2]. Normally, because the perpendicular spatial scale of electron heat transport is much smaller than that for ion heat transport, heat transport models are based on ion scale fluctuations, such as the ion temperature gradient (ITG) mode and the drift wave (DW) mode [3,4]. Recently, on the other hand, the anomalous electron heat transport is also a big issue [5], which is considered to be caused by the ETG driven instability [6,7].…”

Section: Introductionmentioning

confidence: 99%

Plasma Structure Control and New-Concept Plasma Process for Novel Nano-Bio Materials

Kaneko

Moon

Takahashi

2014

Proceedings of the 12th Asia Pacific Physics Conference (APPC12)

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First, a novel method to control plasma structures, such as electron temperature gradient (ETG) in magnetized non-equilibrium plasmas, has been developed. Using the controlled ETG, the excitation mechanism of the ETG driven instability (ETG mode) are clarified. Furthermore, the nonlinear coupling of the high-frequency ETG mode and the low-frequency drift-wave (DW) mode is investigated using the bispectral analysis, and consequently, it is found that the energy of the ETG mode is transferred to the DW mode via the multi-scale nonlinear interaction. Second, highly-ordered periodic structures of the gold nanoparticles (AuNPs) are formed by transcribing the controlled plasma structure to the surface of the ionic liquid, where the spatially selective synthesis of the AuNPs is realized. Third, the new-concept plasma process is developed to create innovative nano-bio materials using plasma-liquid interface. Size-and structure-controlled AuNPs covered with DNA are synthesized using a pulse-driven gas-liquid interfacial discharge plasma for the application to next-generation drug delivery systems.

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Collisionless Drift Waves Ranging from Current‐Driven, Shear‐Modified, and Electron‐Temperature‐Gradient Modes

Cited by 6 publications

References 16 publications

Spectral properties of electrostatic drift wave turbulence in the laboratory and the ionosphere

Spectral properties of electrostatic drift wave turbulence in the laboratory and the ionosphere

Models for electrostatic drift waves with density variations along magnetic field lines

Plasma Structure Control and New-Concept Plasma Process for Novel Nano-Bio Materials

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