The mode transition process in collisional drift waves and self-consistent plasma diffusion across a magnetic field

1977 ◽  
Vol 55 (15) ◽  
pp. 1356-1359 ◽  
Author(s):  
R. Jones
Keyword(s):  
Magnetic Field ◽  
Transition Process ◽  
Plasma Transport ◽  
Drift Waves ◽  
Mode Transition ◽  
Linear Mode ◽  
Drift Wave ◽  
Self Consistent ◽  
Plasma Diffusion ◽  
Wave Induced

Drift wave induced cross field plasma transport is observed to destabilize new drift instabilities which then act to quench the original linear mode and enhance diffusion.

Enhanced plasma losses due to collisional drift waves and their reduction by dynamic stabilization in a weakly ionized plasma

1979 ◽  
Vol 57 (11) ◽  
pp. 1890-1895
Author(s):  
S. Q. Mah ◽  
H. W. H. Van Andel
Keyword(s):  
Magnetic Field ◽  
Phase Difference ◽  
Dynamic Stabilization ◽  
Plasma Transport ◽  
Drift Waves ◽  
Azimuthal Magnetic Field ◽  
Potential Fluctuations ◽  
Weakly Ionized ◽  
Weakly Ionized Plasma ◽  
Good Agreement

The mechanism of anomalous plasma transport associated with dissipative drift instabilities in a weakly ionized plasma is investigated experimentally. Detailed measurements of the phase difference between electron density and potential fluctuations are presented. The results show good agreement between predicted anomalous losses associated with this phase difference and measured reductions in the plasma density. It is shown experimentally that dynamic stabilization using an oscillating azimuthal magnetic field effectively reduces the plasma losses due to the fluctuations.

scholarly journals Collisional drift waves in stellarator plasmas

2003 ◽  
Vol 81 (12) ◽  
pp. 1309-1330
Author(s):  
J LV Lewandowski
Keyword(s):  
Magnetic Field ◽  
Equilibrium Model ◽  
Computational Study ◽  
Local Equilibrium ◽  
Edge Plasma ◽  
Drift Waves ◽  
Field Equations ◽  
Drift Wave ◽  
The Impact ◽  
The Magnetic Field

A computational study of resistive drift waves in the edge plasma of a stellarator with an helical magnetic axis is presented. Three coupled field equations, describing the collisional drift-wave dynamics in the linear approximation, are solved as an initial-value problem along the magnetic field line. The magnetohydrodynamic equilibrium is obtained from a three-dimensional local equilibrium model. The use of a local magnetohydrodynamic equilibrium model allows for a computationally efficient systematic study of the impact of the magnetic field structure on drift-wave stability. PACS Nos.: 52.35.Kt, 52.30.Jb, 52.35.Ra

Finite-beta and curvature drift effects on drift waves near the plasmapause

1983 ◽  
Vol 29 (1) ◽  
pp. 85-97 ◽  
Author(s):  
S. Migliuolo ◽  
V. L. Patel
Keyword(s):  
Magnetic Field ◽  
Spatial Structure ◽  
Linear Stability ◽  
Unstable Mode ◽  
Two Dimensions ◽  
Drift Waves ◽  
Drift Wave ◽  
The Earth ◽  
The Magnetic Field ◽  
Scale Length

The linear stability of finite-β drift waves, near the plasmapause of the earth, is analysed for the case in which the magnetic field is non-uniform in two dimensions. The coupling of the drift wave to the oscillation of the magnetic field, due to non-zero β, is found to be destabilizing. The spatial structure of the unstable mode is found to be governed by the ‘curvature’ scale length of the equilibrium magnetic field.

scholarly journals Drift waves and magnetic field oscillations in cylindrical plasmas

1988 ◽  
Vol 40 (2) ◽  
pp. 319-336 ◽  
Author(s):  
H. A. Aebischer ◽  
Yu. S. Sayasov
Keyword(s):  
Magnetic Field ◽  
Electron Temperature ◽  
Radial Distribution ◽  
Drift Waves ◽  
Complex Eigenvalue ◽  
Ion Temperature ◽  
Drift Wave ◽  
Temperature Oscillations ◽  
Wave Phenomena ◽  
Numerical Program

A general investigation of linear drift-wave phenomena in cylindrically bounded plasmas, immersed in a magnetic field without shear and curvature, is performed within the two-fluid hydrodynamical approximation, taking into account electron-temperature oscillations and inhomogeneous radial distributions of the undisturbed electron density and temperature. For plasmas in which the electron temperature strongly exceeds the ion temperature the problem is reduced to an ordinary complex second-order differential equation describing the radial distribution of the oscillating electric potential. It is shown that the presence of electron-temperature oscillations (which must always exist in order to satisfy electron-energy conservation) and of radial gradients in the undisturbed electron temperature (which must always exist owing to cooling of the plasma at the boundary) leads to an important modification of the theory of drift waves in cylindrical plasmas (with regard to their stability and the radial distribution of the oscillating quantities) compared with previous papers in which these phenomena were disregarded. A numerical program for solving the corresponding complex-eigenvalue problem has been derived that allows a realistic calculation of all the quantities pertaining to drift-wave phenomena. It has been applied, in particular, to the calculation of the radial distribution of the oscillating coherent magnetic fields accompanying the coherent drift waves. The numerical results prove to be in good agreement with experiments performed with a helium plasma.

scholarly journals Control Strategy of Mode Transition with Engine Start in a Plug-in Hybrid Electric Bus

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2989 ◽  
Author(s):  
Yang ◽  
Zhang ◽  
Zhang ◽  
Tian ◽  
Hu
Keyword(s):  
Control Strategy ◽  
Transition Process ◽  
Structural Features ◽  
Driving Performance ◽  
The State ◽  
Switching Process ◽  
Mode Switching ◽  
Mode Transition ◽  
Power Sources ◽  
Hybrid Electric

Torque coordinated control of the relevant power sources has an important impact on the vehicle dynamics and driving performance during the mode transition of the hybrid electric vehicles(HEVs). Considering the dynamic impact problem caused by mode transition, this paper, based upon the structural features of axially paralleled hybrid power system, introduces the bumpless mode switching control theory to analyze multi-mode transition. Firstly, the state transition process is abstracted as the state space transition problem of hybrid system. Secondly the mode transition is divided into four sub-states, and the state model of each sub-state is established. Thirdly, taking the cost functions as the optimization objective, the state switching process is solved, and the control vectors of each switching process are obtained. Simulation and experimental results show that the proposed control strategy can effectively suppress torque fluctuation, avoid longitudinal acceleration impact, and improve driving performance.

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