Physics of Plasmas

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Electron-acoustic solitary waves in the Earth's inner magnetosphere
Physics of Plasmas - Tập 25 Số 2 - 2018
C. S. Dillard, I. Y. Vasko, F. S. Mozer, O. V. Agapitov, J. W. Bonnell
The broadband electrostatic turbulence observed in the inner magnetosphere is produced by large-amplitude electrostatic solitary waves of generally two types. The solitary waves with symmetric bipolar parallel (magnetic field-aligned) electric field are electron phase space holes. The solitary waves with highly asymmetric bipolar parallel electric field have been recently shown to correspo...... hiện toàn bộ
Electron holes in phase space: What they are and why they matter
Physics of Plasmas - Tập 24 Số 5 - 2017
I. H. Hutchinson
This is a tutorial and selective review explaining the fundamental concepts and some currently open questions concerning the plasma phenomenon of the electron hole. The widespread occurrence of electron holes in numerical simulations, space-craft observations, and laboratory experiments is illustrated. The elementary underlying theory is developed of a one-dimensional electron hole as a lo...... hiện toàn bộ
Electron acoustic solitary waves in a magnetized plasma with nonthermal electrons and an electron beam
Physics of Plasmas - Tập 23 Số 8 - 2016
S. V. Singh, S. Devanandhan, G. S. Lakhina, R. Bharuthram
A theoretical investigation is carried out to study the obliquely propagating electron acoustic solitary waves having nonthermal hot electrons, cold and beam electrons, and ions in a magnetized plasma. We have employed reductive perturbation theory to derive the Korteweg-de-Vries-Zakharov-Kuznetsov (KdV-ZK) equation describing the nonlinear evolution of these waves. The two-dimensional pla...... hiện toàn bộ
Low frequency solitons and double layers in a magnetized plasma with two temperature electrons
Physics of Plasmas - Tập 19 Số 12 - 2012
O. R. Rufai, R. Bharuthram, S. V. Singh, G. S. Lakhina
Finite amplitude non-linear ion-acoustic solitary waves and double layers are studied in a magnetized plasma with cold ions fluid and two distinct groups of Boltzmann electrons, using the Sagdeev pseudo-potential technique. The conditions under which the solitary waves and double layers can exist are found both analytically and numerically. We have shown the existence of negative potential...... hiện toàn bộ
Modeling low pressure collisional plasma sheath with space-charge effect
Physics of Plasmas - Tập 10 Số 6 - Trang 2578-2585 - 2003
Subrata Roy, B. P. Pandey, Jonathan Poggie, Datta V. Gaitonde
The present work develops a computationally efficient one-dimensional subgrid embedded finite element formulation for plasma-sheath dynamics. The model incorporates space-charge effect throughout the whole plasma and the sheath region using multifluid equations. Secondary electron emission is not considered. A third-order temperature dependent polynomial is used to self-consistently calcul...... hiện toàn bộ
Lie-transform theory of transport in plasma turbulence
Physics of Plasmas - Tập 21 Số 7 - 2014
Shaojie Wang
From the Vlasov equation, a phase-space transport equation is derived by using the Lie-transform approach, and its connection with the quasilinear transport, nonlinear stochastic transport, and fractional transport equations are discussed. The phase-space transport equation indicates a particle redistribution in the real space induced by the inhomogeneity in the energy space distribution a...... hiện toàn bộ
Explicit Runge–Kutta integrator with Hamiltonian correction for long-time simulations of guiding-center orbit in tokamak configurations
Physics of Plasmas - Tập 15 Số 12 - 2008
Xiaotao Xiao, Shaojie Wang
Hamiltonian correction method is proposed to improve the variable time-step fourth-order Runge–Kutta methods in computing guiding-center orbits in a tokamak. It is found that the new method can significantly improve the computation efficiency of the conventional Runge–Kutta method in simulation of the long-time behavior of the guiding-center orbits.
Linear gyrokinetic theory and computation of the gyrocenter motion based on the exact canonical variables for axisymmetric tokamaks
Physics of Plasmas - Tập 18 Số 4 - 2011
Yingfeng Xu, Xiaotao Xiao, Shaojie Wang
Linear gyrokinetic theory based on the Lie-transform perturbation method is presented in terms of the exact canonical variables. In the linear drift approximation, it is shown that the gyrocenter equations of motion based on the canonical variables are equivalent to the usual guiding-center equations of motion. A numerical code is developed to advance the gyrocenter motion in terms of the ...... hiện toàn bộ
A new continuum approach for nonlinear kinetic simulation and transport analysis
Physics of Plasmas - Tập 22 Số 2 - 2015
Zhujiang Dai, Yingfeng Xu, Lei Ye, Xiaotao Xiao, Shaojie Wang
A numerical code based on the I-transform approach is developed to solve the nonlinear Vlasov equation and carry out the transport analysis. The numerical results given by the I-transform approach agree with the conservative semi-Lagrangian approach in the Landau damping case and the bump-on-tail instability case. The diffusivities induced by the random fields and the quasilinear transport...... hiện toàn bộ
Control and diagnosis of temperature, density, and uniformity in x-ray heated iron/magnesium samples for opacity measurements
Physics of Plasmas - Tập 21 Số 5 - 2014
Taisuke Nagayama, J. E. Bailey, Guillaume Loisel, Stephanie B. Hansen, G. A. Rochau, Roberto Mancini, J. J. MacFarlane, I. Golovkin
Experimental tests are in progress to evaluate the accuracy of the modeled iron opacity at solar interior conditions, in particular to better constrain the solar abundance problem [S. Basu and H. M. Antia, Phys. Rep. 457, 217 (2008)]. Here, we describe measurements addressing three of the key requirements for reliable opacity experiments: control of sample conditions, independent sample co...... hiện toàn bộ
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