Drift wave driven double layers in an inhomogeneous magnetized plasma in the presence of stationary dust

2017 ◽  
Vol 24 (4) ◽  
pp. 044501 ◽  
Author(s):  
Q. Haque ◽  
S. Ali Shan
Keyword(s):  
Magnetized Plasma ◽  
Double Layers ◽  
Drift Wave ◽  
Stationary Dust

Ion-acoustic solitary structures at the acoustic speed in a collisionless magnetized nonthermal dusty plasma

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Debdatta Debnath ◽  
Anup Bandyopadhyay
Keyword(s):  
Double Layer ◽  
Negative Polarity ◽  
Critical Value ◽  
Magnetized Plasma ◽  
Double Layers ◽  
Nonthermal Electrons ◽  
Solitary Structures ◽  
Ion Acoustic ◽  
Density Of Electrons ◽  
Acoustic Speed

Abstract At the acoustic speed, we have investigated the existence of ion-acoustic solitary structures including double layers and supersolitons in a collisionless magnetized plasma consisting of negatively charged static dust grains, adiabatic warm ions, and nonthermal electrons. At the acoustic speed, for negative polarity, the system supports solitons, double layers, supersoliton structures after the formation of double layer, supersoliton structures without the formation of double layer, solitons after the formation of double layer whereas the system supports solitons and supersolitons without the formation of double layer for the case of positive polarity. But it is not possible to get the coexistence of solitary structures (including double layers and supersolitons) of opposite polarities. For negative polarity, we have observed an important transformation viz., soliton before the formation of double layer → double layer → supersoliton → soliton after the formation of double layer whereas for both positive and negative polarities, we have observed the transformation from solitons to supersolitons without the formation of double layer. There does not exist any negative (positive) potential solitary structures within 0 < μ < μ c (μ c < μ < 1) and the amplitude of the positive (negative) potential solitary structure decreases for increasing (decreasing) μ and the solitary structures of both polarities collapse at μ = μ c, where μ c is a critical value of μ, the ratio of the unperturbed number density of electrons to that of ions. Similarly there exists a critical value β e2 of the nonthermal parameter β e such that the solitons of both polarities collapse at β e = β e2.

scholarly journals Theory of the tertiary instability and the Dimits shift within a scalar model

2020 ◽  
Vol 86 (4) ◽  
Author(s):  
Hongxuan Zhu ◽  
Yao Zhou ◽  
I. Y. Dodin
Keyword(s):  
Turbulent Transport ◽  
Plasma Phys ◽  
Magnetized Plasma ◽  
Radial Coordinate ◽  
Flow Shear ◽  
Zonal Flows ◽  
Drift Wave ◽  
Zonal Velocity ◽  
Instability Growth ◽  
Traditional Paradigm

The Dimits shift is the shift between the threshold of the drift-wave primary instability and the actual onset of turbulent transport in a magnetized plasma. It is generally attributed to the suppression of turbulence by zonal flows, but developing a more detailed understanding calls for consideration of specific reduced models. The modified Terry–Horton system has been proposed by St-Onge (J. Plasma Phys., vol. 83, 2017, 905830504) as a minimal model capturing the Dimits shift. Here, we use this model to develop an analytic theory of the Dimits shift and a related theory of the tertiary instability of zonal flows. We show that tertiary modes are localized near extrema of the zonal velocity $U(x)$ , where $x$ is the radial coordinate. By approximating $U(x)$ with a parabola, we derive the tertiary-instability growth rate using two different methods and show that the tertiary instability is essentially the primary drift-wave instability modified by the local $U'' \doteq {\rm d}^2 U/{\rm d} x^2 $ . Then, depending on $U''$ , the tertiary instability can be suppressed or unleashed. The former corresponds to the case when zonal flows are strong enough to suppress turbulence (Dimits regime), while the latter corresponds to the case when zonal flows are unstable and turbulence develops. This understanding is different from the traditional paradigm that turbulence is controlled by the flow shear $| {\rm d} U / {\rm d} x |$ . Our analytic predictions are in agreement with direct numerical simulations of the modified Terry–Horton system.

Drift Wave Instability in the Presense of an RF-Field in a Magnetized Plasma

1983 ◽  
Vol 52 (2) ◽  
pp. 492-500 ◽  
Author(s):  
Alexander J. Anastassiades ◽  
Constantine L. Xaplanteris
Keyword(s):  
Magnetized Plasma ◽  
Wave Instability ◽  
Drift Wave

Ion-acoustic double layers in a magnetized plasma

1986 ◽  
Vol 29 (3) ◽  
pp. 714 ◽  
Author(s):  
K. S. Goswami ◽  
S. Bujarbarua
Keyword(s):  
Magnetized Plasma ◽  
Double Layers ◽  
Ion Acoustic ◽  
Ion Acoustic Double Layers

scholarly journals Eddy, drift wave and zonal flow dynamics in a linear magnetized plasma

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
H. Arakawa ◽  
S. Inagaki ◽  
M. Sasaki ◽  
Y. Kosuga ◽  
T. Kobayashi ◽  
...  
Keyword(s):  
Zonal Flow ◽  
Flow Dynamics ◽  
Magnetized Plasma ◽  
Drift Wave

Multi-ion Double Layers in a Magnetized Plasma

2015 ◽  
Vol 64 (5) ◽  
pp. 555-564 ◽  
Author(s):  
M. Shahmansouri ◽  
H. Alinejad ◽  
M. Tribeche
Keyword(s):  
Magnetized Plasma ◽  
Double Layers

Drift-wave observation in a toroidal magnetized plasma and comparison with a modified Hasegawa-Wakatani model

2018 ◽  
Vol 25 (6) ◽  
pp. 062127
Author(s):  
P. Donnel ◽  
P. Morel ◽  
C. Honoré ◽  
Ö. Gürcan ◽  
V. Pisarev ◽  
...  
Keyword(s):  
Magnetized Plasma ◽  
Drift Wave ◽  
Wave Observation
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