Reduction effect of neutral density on the excitation of turbulent drift waves in a linear magnetized plasma with flow

Saitou, Yoshifumi; Yonesu, Akira; Shinohara, Shunjiro; Ignatenko, Maxim; Kasuya, Naohiro; Kawaguchi, Masato; Terasaka, Kenichiro; Nishijima, T.; Nagashima, Yoshihiko; Kawai, Yoshinobu; Yagi, M.; Itoh, Sanae I.; Azumi, M.; Itoh, K.

doi:10.1063/1.2743030

Cited by 18 publications

(16 citation statements)

References 24 publications

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“…At 3 cm, the axial flow measured with the Mach probe is strongly sheared. Maximum Mach numbers in perpendicular and axial direction are about 0.25, respectively 0.4, which is in agreement with Mach numbers between 0.3 and 0.6 found in a similar linear device with similar experimental conditions [15]. In the 0.4 Pa case, Mach probe measurements show similar qualitative features as in the lower pressure case; Axial flow shear and maximum perpendicular flow are measured around 3.5 cm.…”

Section: Mean Flow Measurementssupporting

confidence: 88%

Configuration of Flows in a Cylindrical Plasma Device

Oldenbürger

Uriu

Kobayashi

et al. 2012

Plasma and Fusion Research

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Ion flow is studied in the cylindrical magnetized Argon plasma of the PANTA device using several experimental methods. Time delay estimation technique (TDE) is used to measure the azimuthal propagation of density fluctuations between two electrostatic probes. Ion flux is also studied in azimuthal and axial direction using a newly installed Mach probe. TDE shows velocity profiles qualitatively consistent with expected drift wave propagation and E × B rotation. The Mach probe shows a maximum azimuthal flow and an axial flow shear close to the maximum density gradient and maximum fluctuation position. Striking differences exist in the detected axial ion flows depending on the discharge parameters. In high neutral pressure conditions reversal of axial ion flow was detected in the outer part of the plasma column. Temporal evolution of flows and fluctuations are compared as a first step to assess interplay between plasma turbulence and flows in the radial, axial and azimuthal directions.

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Section: Mean Flow Measurementssupporting

confidence: 88%

Configuration of Flows in a Cylindrical Plasma Device

Oldenbürger

Uriu

Kobayashi

et al. 2012

Plasma and Fusion Research

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“…Experiments were conducted on a linear device, the large mirror device, 25 and experimental conditions are reported in Ref. 26.…”

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confidence: 99%

Observation of the parametric-modulational instability between the drift-wave fluctuation and azimuthally symmetric sheared radial electric field oscillation in a cylindrical laboratory plasma

et al. 2009

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Observation of the parametric-modulational interaction between the drift-wave fluctuation (7–8 kHz) and azimuthally symmetric sheared radial electric field structure (∼0.4 kHz) in a cylindrical laboratory plasma is presented. Oscillation of the sheared radial electric field is synchronized at modulations of the radial wave number and Reynolds stress per mass density of the drift-wave spectrum. Bispectral analysis at the location where the sheared radial electric field has finite radial wave numbers shows that nonlinear energy transfers from the drift wave to the sheared radial electric field occur. Nonlocal energy transfers of fluctuations via “channel of the azimuthally symmetric sheared radial electric field” in spectral space as well as real space are discovered.

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“…3 Plasma experiments in a simple linear configuration have been revisited recently for quantitative understandings of the structural formation mechanism by turbulence. [4][5][6][7][8][9][10][11][12] A density gradient drives the drift wave turbulence in these plasmas. Two-dimensional measurements reveal the feature of turbulent structures 13,14 and their formation mechanisms by nonlinear mode coupling.…”

Section: Introductionmentioning

confidence: 99%

Selective formation of turbulent structures in magnetized cylindrical plasmas

et al. 2008

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The mechanism of nonlinear structural formation has been studied with a three-field reduced fluid model, which is extended to describe the resistive drift wave turbulence in magnetized cylindrical plasmas. In this model, ion-neutral collisions strongly stabilize the resistive drift wave, and the formed structure depends on the collision frequency. If the collision frequency is small, modulational coupling of unstable modes generates a zonal flow. On the other hand, if the collision frequency is large, a streamer, which is a localized vortex in the azimuthal direction, is formed. The structure is generated by nonlinear wave coupling and is sustained for a much longer duration than the drift wave oscillation period. This is a minimal model for analyzing the turbulent structural formation mechanism by mode coupling in cylindrical plasmas, and the competitive nature of structural formation is revealed. These turbulent structures affect particle transport.

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Reduction effect of neutral density on the excitation of turbulent drift waves in a linear magnetized plasma with flow

Cited by 18 publications

References 24 publications

Configuration of Flows in a Cylindrical Plasma Device

Configuration of Flows in a Cylindrical Plasma Device

Observation of the parametric-modulational instability between the drift-wave fluctuation and azimuthally symmetric sheared radial electric field oscillation in a cylindrical laboratory plasma

Selective formation of turbulent structures in magnetized cylindrical plasmas

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