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

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

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

Applications of the wave kinetic approach: from laser wakefields to drift wave turbulence

2010 ◽  
Vol 76 (6) ◽  
pp. 903-914 ◽  
Author(s):  
R. M. G. M. TRINES ◽  
R. BINGHAM ◽  
L. O. SILVA ◽  
J. T. MENDONÇA ◽  
P. K. SHUKLA ◽  
...  
Keyword(s):  
Pump Wave ◽  
Random Phase ◽  
Zonal Flow ◽  
Magnetized Plasma ◽  
Wave Turbulence ◽  
Drift Wave Turbulence ◽  
Drift Wave ◽  
Alternative Approach ◽  
Photon Acceleration ◽  
Flow Turbulence

AbstractNonlinear wave-driven processes in plasmas are normally described by either a monochromatic pump wave that couples to other monochromatic waves, or as a random phase wave coupling to other random phase waves. An alternative approach involves a random or broadband pump coupling to monochromatic and/or coherent structures in the plasma. This approach can be implemented through the wave-kinetic model. In this model, the incoming pump wave is described by either a bunch (for coherent waves) or a sea (for random phase waves) of quasi-particles. This approach has been applied to both photon acceleration in laser wakefields and drift wave turbulence in magnetized plasma edge configurations. Numerical simulations have been compared to experiments, varying from photon acceleration to drift mode-zonal flow turbulence, and good qualitative correspondences have been found in all cases.

A phenomenological theory of drift wave type plasma turbulence

1979 ◽  
Vol 21 (3) ◽  
pp. 423-429 ◽  
Author(s):  
Amiya K. Sen
Keyword(s):  
Phenomenological Theory ◽  
Plasma Turbulence ◽  
Magnetized Plasma ◽  
Wave Type ◽  
Hydrodynamic Turbulence ◽  
Drift Wave ◽  
Kolmogorov Spectrum ◽  
Strong Turbulence

A phenomenological theory of drift type turbulence in inhomogeneous magnetized plasma is developed in the spirit of the Kolmogorov spectrum of hydrodynamic turbulence. We model the spectrum in terms of subspectra: production, equilibrium and dissipation. Different nonlinearities and either weak or strong turbulence characterize different subspectra.

Suppression of drift wave turbulence and zonal flow formation by changing axial boundary conditions in a cylindrical magnetized plasma device

2013 ◽  
Vol 20 (1) ◽  
pp. 012304 ◽  
Author(s):  
Saikat Chakraborty Thakur ◽  
Min Xu ◽  
Peter Manz ◽  
Nicolas Fedorczak ◽  
Chris Holland ◽  
...  
Keyword(s):  
Boundary Conditions ◽  
Zonal Flow ◽  
Magnetized Plasma ◽  
Wave Turbulence ◽  
Drift Wave Turbulence ◽  
Drift Wave ◽  
Flow Formation ◽  
Plasma Device

Numerical simulations of collisional drift-wave turbulence in a magnetized plasma column

2007 ◽  
Vol 49 (5A) ◽  
pp. A109-A119 ◽  
Author(s):  
C Holland ◽  
G R Tynan ◽  
J H Yu A James ◽  
D Nishijima ◽  
M Shimada ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Plasma Column ◽  
Magnetized Plasma ◽  
Wave Turbulence ◽  
Drift Wave Turbulence ◽  
Drift Wave

Roles of solitary eddy and splash in drift wave–zonal flow system in a linear magnetized plasma

2019 ◽  
Vol 26 (5) ◽  
pp. 052305 ◽  
Author(s):  
H. Arakawa ◽  
M. Sasaki ◽  
S. Inagaki ◽  
Y. Kosuga ◽  
T. Kobayashi ◽  
...  
Keyword(s):  
Flow System ◽  
Zonal Flow ◽  
Magnetized Plasma ◽  
Drift Wave
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