Physics of Plasmas: All Topics

On interaction of large dust grains with fusion plasma

S. I. Krasheninnikov and R. D. Smirnov
So far the models used to study dust grain-plasma interactions in fusion plasmas neglect the effects of dust material vapor, which is always present around dust in rather hot and dense edge plasma environment in fusion devices. However, when the vapor density and/or the amount of ionized vapor atoms ... [Phys. Plasmas 16, 114501 (2009)] published Fri Nov 6, 2009.

Variational coordinate transformation in plasma physics

Ryan White, Emila R. Solano, and R. D. Hazeltine
It is well-known from scaling arguments that action-based field theories do not possess localized solutions in spaces of more than one dimension. The same scaling argument, modified to account for external forces, is applied to magnetic plasma confinement in an axisymmetric torus. It yields an integ ... [Phys. Plasmas 16, 112505 (2009)] published Fri Nov 6, 2009.

Dynamically stable, self-similarly evolving, and self-organized states of high beta tokamak and reversed pinch plasmas and advanced active control

Yoshiomi Kondoh and Toshinobu Fukasawa
Generalized simultaneous eigenvalue equations derived from a generalized theory of self-organization are applied to a set of simultaneous equations for two-fluid model plasmas. An advanced active control by using theoretical time constants is proposed by predicting quantities to be controlled. Typic ... [Phys. Plasmas 16, 112504 (2009)] published Fri Nov 6, 2009.

Obliquely propagating cnoidal waves in a magnetized dusty plasma with variable dust charge

L. L. Yadav and V. K. Sayal
We have studied obliquely propagating dust-acoustic nonlinear periodic waves, namely, dust-acoustic cnoidal waves, in a magnetized dusty plasma consisting of electrons, ions, and dust grains with variable dust charge. Using reductive perturbation method and appropriate boundary conditions for nonlin ... [Phys. Plasmas 16, 113703 (2009)] published Thu Nov 5, 2009.

Transport of energy by ultraintense laser-generated electrons in nail-wire targets

T. Ma, M. H. Key, R. J. Mason, K. U. Akli, R. L. Daskalova et al.
Nail-wire targets (20 [mu]m diameter copper wires with 80 [mu]m hemispherical head) were used to investigate energy transport by relativistic fast electrons generated in intense laser-plasma interactions. The targets were irradiated using the 300 J, 1 ps, and 2 x 10 Wcm Vulcan laser at the Ruther ... [Phys. Plasmas 16, 112702 (2009)] published Wed Nov 4, 2009.

Dust negative ion acoustic shock waves in a dusty multi-ion plasma with positive dust charging current

S. S. Duha
Recent analysis of Mamun et al. [ Phys. Lett. A 373, 2355 (2009)], who considered electrons, light positive ions, heavy negative ions, and extremely massive (few micron size) charge fluctuating dust, has been extended by positive dust charging current, i.e., considering the charging currents for po ... [Phys. Plasmas 16, 113701 (2009)] published Wed Nov 4, 2009.

Technique for analysis of interparticle interaction in nonideal dissipative systems with isotropic pair potentials

O. S. Vaulina and E. A. Lisin
A new technique for determining interaction forces between the particles in nonideal dissipative systems with isotropic pair potentials is presented. This technique is based on solving of the inverse problem describing movement of dust particles by a system of Langevin equations. Numerical simulatio ... [Phys. Plasmas 16, 113702 (2009)] published Wed Nov 4, 2009.

Linearized model collision operators for multiple ion species plasmas and gyrokinetic entropy balance equations

H. Sugama, T.-H. Watanabe, and M. Nunami
Linearized model collision operators for multiple ion species plasmas are presented that conserve particles, momentum, and energy and satisfy adjointness relations and Boltzmann's H-theorem even for collisions between different particle species with unequal temperatures. The model collision operator ... [Phys. Plasmas 16, 112503 (2009)] published Wed Nov 4, 2009.

Enhancement of backward Raman scattering by electron-ion collisions

Z. J. Liu, Shao-ping Zhu, L. H. Cao, C. Y. Zheng, X. T. He et al.
The propagation of light waves in an underdense plasma is studied using one-dimensional VlasovMaxwell numerical simulation. It is found that the backward stimulated Raman scattering will be enhanced by electron-ion collisions. With appropriate electron-ion collision rate the Langmuir waves, driven v ... [Phys. Plasmas 16, 112703 (2009)] published Wed Nov 4, 2009.

Coupled nonlinear drift and ion acoustic waves in dense dissipative electron-positron-ion magnetoplasmas

W. Masood, S. Karim, H. A. Shah, and M. Siddiq
Linear and nonlinear propagation characteristics of drift ion acoustic waves are investigated in an inhomogeneous electron-positron-ion (e-p-i) quantum magnetoplasma with neutrals in the background using the well known quantum hydrodynamic model. In this regard, Kortewegde VriesBurgers (KdVB) and Ka ... [Phys. Plasmas 16, 112302 (2009)] published Wed Nov 4, 2009.

Validity of closed periodic magnetic focusing for sheet electron beams

Ding Zhao
Theoretical analyses and numerical calculations have demonstrated that a closed periodic cusped magnetic (PCM) field can effectively confine a sheet electron beam in two transverse directions (i.e., in the wide and narrow dimensions, simultaneously) for stable long distance transport in which the si ... [Phys. Plasmas 16, 113102 (2009)] published Tue Nov 3, 2009.

Steady state self-induced current in tokamak

Yu. V. Gott and E. I. Yurchenko
A model, which may make it possible to self-consistently calculate the self-driven current in tokamaks taking into account asymmetry and bootstrap currents, is presented. It is shown that the described self-driven current can provide steady-state tokamak operation without the seed current produced w ... [Phys. Plasmas 16, 112502 (2009)] published Tue Nov 3, 2009.

Counter-facing plasma focus system as a repetitive and/or long-pulse high energy density plasma source

Yutaka Aoyama, Mitsuo Nakajima, and Kazuhiko Horioka
A plasma focus system composed of a pair of counter-facing coaxial plasma guns is proposed as a long-pulse and/or repetitive high energy density plasma source. A proof-of-concept experiment demonstrated that with an assist of breakdown and outer electrode connections, current sheets evolved into a c ... [Phys. Plasmas 16, 110701 (2009)] published Tue Nov 3, 2009.

A closure scheme for modeling rf modifications to the fluid equations

C. C. Hegna and J. D. Callen
A procedure to include the effects of externally applied rf sources in a comprehensive fluid model is outlined. The fluid equations are derived from moments of a kinetic equation that includes the effects of an rf source. In general, this source produces additional terms in each of the fluid equatio ... [Phys. Plasmas 16, 112501 (2009)] published Mon Nov 2, 2009.

Onset and saturation of backward stimulated Raman scattering of laser in trapping regime in three spatial dimensions

L. Yin, B. J. Albright, H. A. Rose, K. J. Bowers, B. Bergen et al.
A suite of three-dimensional (3D) VPIC [K. J. Bowers et al., Phys. Plasmas 15, 055703 (2008)] particle-in-cell simulations of backward stimulated Raman scattering (SRS) in inertial confinement fusion hohlraum plasma has been performed on the heterogeneous multicore supercomputer, Roadrunner, present ... [Phys. Plasmas 16, 113101 (2009)] published Mon Nov 2, 2009.

Anomalous transport of energetic particles in ITER relevant scenarios

M. Albergante, J. P. Graves, A. Fasoli, F. Jenko, and T. Dannert
The anomalous transport of energetic ions in the presence of turbulent fields is investigated. Nonlinear simulations of a steady-state ITER [R. Aymar et al., Nucl. Fusion 41, 1301 (2001)] scenario have been carried out using the gyrokinetic turbulence code GENE [F. Jenko et al., Phys. Plasmas 7, 190 ... [Phys. Plasmas 16, 112301 (2009)] published Mon Nov 2, 2009.

Spherical RayleighTaylor growth of three-dimensional broadband perturbations on OMEGA

V. A. Smalyuk, S. X. Hu, J. D. Hager, J. A. Delettrez, D. D. Meyerhofer et al.
Spherical RayleighTaylor (RT) growth experiments of three-dimensional (3D) broadband nonuniformities were conducted in the acceleration phase of spherical implosions on OMEGA [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)]. The targets consisted of 20- and 24-[mu]m-thick plastic spherical shells ... [Phys. Plasmas 16, 112701 (2009)] published Mon Nov 2, 2009.

Langmuir wave linear evolution in inhomogeneous nonstationary anisotropic plasma

I. Y. Dodin, V. I. Geyko, and N. J. Fisch
A hydrodynamic equation describing the linear evolution of a nondissipative Langmuir wave in inhomogeneous nonstationary anisotropic plasma without magnetic field is derived in the geometrical optics approximation. The continuity equation for the wave action density, anticipated from general princip ... [Phys. Plasmas 16, 112101 (2009)] published Mon Nov 2, 2009.

Electrostatic drift modes in quantum dusty plasmas with Jeans terms

Haijun Ren, Zhengwei Wu, Jintao Cao, and Paul K. Chu
Electrostatic drift waves (EDWs) are investigated in nonuniform quantum magnetized dusty plasmas by taking into account dust gravitational effects with the help of the quantum hydrodynamic model. Ions and electrons are viewed as low-temperature Fermi gases, whereas quantum effects are neglected for ... [Phys. Plasmas 16, 103705 (2009)] published Fri Oct 30, 2009.

Extension of the electron dissipation region in collisionless Hall magnetohydrodynamics reconnection

Brian P. Sullivan, A. Bhattacharjee, and Yi-Min Huang
This paper presents SweetParker type scaling arguments in the context of hyper-resistive Hall magnetohydrodynamics. Numerical experiments suggest that both cusplike and modestly more extended geometries are realizable. However, the length of the electron dissipation region, which is taken as a param ... [Phys. Plasmas 16, 102111 (2009)] published Fri Oct 30, 2009.

Characteristics of a velvet cathode under high repetition rate pulse operation

Tao Xun, Jian-De Zhang, Han-Wu Yang, Zi-Cheng Zhang, and Yu-Wei Fan
As commonly used material for cold cathodes, velvet works well in single shot and low repetition rate (rep-rate) high-power microwave (HPM) sources. In order to determine the feasibility of velvet cathodes under high rep-rate operation, a series of experiments are carried out on a high-power diode, ... [Phys. Plasmas 16, 103106 (2009)] published Fri Oct 30, 2009.

Stabilization of the potential multi-steady-state absolute instabilities in a gyrotron traveling-wave amplifier

Chao-Hai Du and Pu-Kun Liu
The problem of spurious oscillations induced by absolute instabilities is the most challenging one that hinders the development of the millimeter-wave gyrotron traveling-wave amplifiers (gyro-TWTs). A spurious oscillation exists as a high order axial mode (HOAM) in the interaction circuit. This pape ... [Phys. Plasmas 16, 103107 (2009)] published Fri Oct 30, 2009.

Quantum effects on the dispersion of ion acoustic waves

A. Mushtaq and D. B. Melrose
The longitudinal response function for an isotropic, nonrelativistic, thermal plasma with the quantum recoil included exactly is used to generalize the dispersion relation for ion acoustic waves and the absorption coefficient for Landau damping to include the quantum recoil. The results are compared ... [Phys. Plasmas 16, 102110 (2009)] published Fri Oct 30, 2009.

Resonant excitation of shear Alfven perturbations by trapped energetic ions in a tokamak

I. G. Abel, B. N. Breizman, S. E. Sharapov, and JET-EFDA Contributors
A new analytic expression is derived for the resonant drive of high n Alfvenic modes by particles accelerated to high energy by ion cyclotron resonance heating. This derivation includes finite orbit effects, and the formalism is completely nonperturbative. The high-n limit is used to calculate the c ... [Phys. Plasmas 16, 102506 (2009)] published Fri Oct 30, 2009.

Random walk of electrons in a gas in the presence of polarized electromagnetic waves: Genesis of a wave induced discharge

Sudeep Bhattacharjee and Samit Paul
The average number of collisions N of seed electrons with neutral gas atoms during random walk in escaping from a given volume, in the presence of polarized electromagnetic waves, is found to vary as N=B(Lambda/lambda)/[1+C(Lambda/lambda)], indicating a modification to the conventional field free sq ... [Phys. Plasmas 16, 104502 (2009)] published Fri Oct 30, 2009.

Efficient generation of quasimonoenergetic ions by Coulomb explosions of optimized nanostructured clusters

M. Murakami and K. Mima
Coulomb explosion of spherical ion clusters is studied, which are composed of homogeneous two-species (light and heavy) ions. A simple analytical model is developed to describe the explosion performance in terms of two dimensionless parameters, the charge-over-mass ratio, and the charge density rati ... [Phys. Plasmas 16, 103108 (2009)] published Fri Oct 30, 2009.

Magnetic multipole induced zero-rotation frequency bounce-resonant loss in a PenningMalmberg trap used for antihydrogen trapping

G. B. Andresen, W. Bertsche, C. C. Bray, E. Butler, C. L. Cesar et al. ALPHA Collaboration
In many antihydrogen trapping schemes, antiprotons held in a short-well PenningMalmberg trap are released into a longer well. This process necessarily causes the bounce-averaged rotation frequency [overline Omega ] of the antiprotons around the trap axis to pass through zero. In the presence of a t ... [Phys. Plasmas 16, 100702 (2009)] published Fri Oct 30, 2009.

Magnetothermal instability of plasmas in a horizontal magnetic field

Haijun Ren, Zhengwei Wu, Jintao Cao, and Paul K. Chu
The linear buoyancy instability in a magnetized plasma, generally referred to as magnetothermal instability (MTI), is investigated by considering anisotropic heat conduction. The external magnetic field is assumed to be horizontal and background heat flux is not taken into account. The general dispe ... [Phys. Plasmas 16, 102109 (2009)] published Thu Oct 29, 2009.

On the effect of rear-surface dielectric coatings on laser-driven proton acceleration

S. Betti, C. A. Cecchetti, E. Forster, A. Gamucci, A. Giulietti et al.
Laser-driven ion acceleration has been experimentally investigated by irradiating, with tightly focused femtosecond laser pulses at 5 x 10 W/cm, thin metal foils, which have been back-coated with a [mu]m thick dielectric layer. The observation we report shows the production of MeV proton bunches wi ... [Phys. Plasmas 16, 100701 (2009)] published Thu Oct 29, 2009.

Kinetic Alfven waves turbulence in the Earth's magnetosphere

Sachin Kumar and R. P. Sharma
The numerical simulations of the model equation governing the nonlinear dynamics of kinetic Alfven waves in the intermediate-beta plasmas are performed. When the nonlinearity arises due to the ponderomotive force driven density perturbations of kinetic Alfven waves, the model equation turns out to b ... [Phys. Plasmas 16, 102904 (2009)] published Wed Oct 28, 2009.

Effect of energetic electrons on near-wall sheath voltage in the cathode region of a cold cathode direct current discharge

J. Blessington, S. F. Adams, V. I. Demidov, and J. M. Williamson
It is experimentally demonstrated that energetic electrons originating from the cathode or produced in volumetric processes in the cathode region of a cold cathode direct current discharge can create a large potential drop in the near-wall sheath. This voltage drop may be much greater than kT/e (whe ... [Phys. Plasmas 16, 104501 (2009)] published Wed Oct 28, 2009.

Unified theory of resistive and inertial ballooning modes in three-dimensional configurations

T. Rafiq, C. C. Hegna, J. D. Callen, and A. H. Kritz
Analytic results for the stability of resistive ballooning modes (RBMs) and electron inertial ballooning modes are obtained using a two-scale analysis. This work generalizes previous calculations used for axisymmetric salpha geometry [R. H. Hastie, J. J. Ramos, and F. Porcelli, Phys. Plasmas 10, 440 ... [Phys. Plasmas 16, 102505 (2009)] published Wed Oct 28, 2009.

Oscillations of the collisionless sheath at grazing incidence of the magnetic field

M. Shoucri, H. Gerhauser, and K. H. Finken
An Eulerian Vlasov code is used to study the physics of a collisionless sheath with grazing angles of incidence of the magnetic field. The electrons are treated with a parallel-B kinetic equation. In the case where the ion gyroradius is large compared to the Debye length, the electrons, frozen by th ... [Phys. Plasmas 16, 103506 (2009)] published Wed Oct 28, 2009.

Evolution of Alfvenic wave envelopes in spin-1/2 quantum Hall-magnetohydrodynamic plasmas

A. P. Misra, N. K. Ghosh, and P. K. Shukla
The one-dimensional oblique propagation of large amplitude magnetohydrodynamic (MHD) waves in a high-beta quantum Hall-MHD plasma is studied with electron spin-1/2 effects. The plasma beta becomes high by the condition for the nonrelativistic fluid model to be valid and the condition for the collect ... [Phys. Plasmas 16, 102309 (2009)] published Wed Oct 28, 2009.

Parameters of a collisional radio-frequency sheath and dust characteristics resulting from the microparticle levitation

V. V. Yaroshenko, T. Antonova, H. M. Thomas, and G. E. Morfill
The screening length, the time-average electric field, and the particle charge as well as the local vertical gradients of these quantities are determined experimentally within a sheath of a capacitively coupled rf, 13.56 MHz, discharge at enhanced argon gas pressures of 30, 55, and 100 Pa. The param ... [Phys. Plasmas 16, 103505 (2009)] published Tue Oct 27, 2009.

Magnetic field and electromagnetic wave properties of carbon monoxide with high-pressure disproportionation single-walled carbon nanotubes

S. B. Tooski
A double-fluid theory is used to find the electromagnetic wave absorption of carbon monoxide with iron-catalyzed high-pressure disproportionation (HiPco)-grown single-walled carbon nanotubes (SWNTs). The electromagnetic wave absorption of carbon monoxide with HiPco SWNTs is obtained and is studied n ... [Phys. Plasmas 16, 103302 (2009)] published Tue Oct 27, 2009.

Runaway electron transport via tokamak microturbulence

T. Hauff and F. Jenko
The mechanisms found for the magnetic transport of fast ions in the work of Hauff et al. [Phys. Rev. Lett. 102, 075004 (2009)] are extended to the diffusion of runaway electrons. Due to their smaller mass and larger energy, they behave strongly relativistically, for which reason the scaling laws def ... [Phys. Plasmas 16, 102308 (2009)] published Tue Oct 27, 2009.

Terahertz generation via optical rectification of x-mode laser in a rippled density magnetized plasma

Lalita Bhasin and V. K. Tripathi
A scheme of resonant terahertz radiation generation by the optical rectification of a picosecond laser pulse in rippled density magnetized plasma is examined. The x-mode laser pulse, propagating perpendicular to dc magnetic field, exerts a quasistatic ponderomotive force on electrons, imparting them ... [Phys. Plasmas 16, 103105 (2009)] published Wed Oct 21, 2009.

Time-resolved measurements on reflectivity of an ultrafast laser-induced plasma mirror

Yi Cai, Wentao Wang, Changquan Xia, Jiansheng Liu, Li Liu et al.
Using a linearly chirped laser pulse to irradiate antireflection coated targets, the time-varying reflectivity of a plasma mirror (PM) has been measured at various laser intensities from 10 to 10 W/cm. The onset of plasma generation as well as the formation process of a PM with the highest reflecti ... [Phys. Plasmas 16, 103104 (2009)] published Tue Oct 20, 2009.

Full Coulomb collision operator in the moment expansion

Jeong-Young Ji and Eric D. Held
The full Coulomb collision operator and its moments including nonlinear terms are analytically calculated in the moment expansion. In coupling nonlinear terms, the product formula which expresses a product of two harmonic tensors as a series of single harmonic tensors is derived. The collision opera ... [Phys. Plasmas 16, 102108 (2009)] published Mon Oct 19, 2009.

Numerical simulation of high-current vacuum arc characteristics under combined action of axial magnetic field and external magnetic field from bus bar

Lijun Wang, Shenli Jia, Ke Liu, Liuhuo Wang, and Zongqian Shi
In this paper, the two-dimensional high-current vacuum arc (HCVA) model under the combined action of axial magnetic field (AMF) and external magnetic field from bus bar (EMFBB) is established. Based on this model, the influence of AMF and EMFBB on HCVA characteristics can be simulated and analyzed. ... [Phys. Plasmas 16, 103502 (2009)] published Thu Oct 15, 2009.

Single-fluid stability of stationary plasma equilibria with velocity shear and magnetic shear

Akira Miura
By using incompressible single-fluid equations with a generalized Ohm's law neglecting the electron inertia, a linear eigenmode equation for a magnetic field perturbation is derived for stationary equilibria in a slab geometry with velocity and magnetic shears. The general eigenmode equation contain ... [Phys. Plasmas 16, 102107 (2009)] published Thu Oct 15, 2009.

Continuous wavelet transform based time-scale and multifractal analysis of the nonlinear oscillations in a hollow cathode glow discharge plasma

Md. Nurujjaman, Ramesh Narayanan, and A. N. Sekar Iyengar
Continuous wavelet transform (CWT) based time-scale and multifractal analyses have been carried out on the anode glow related nonlinear floating potential fluctuations in a hollow cathode glow discharge plasma. CWT has been used to obtain the contour and ridge plots. Scale shift (or inversely freque ... [Phys. Plasmas 16, 102307 (2009)] published Thu Oct 15, 2009.

Interpretation of particle pinches and diffusion coefficients in the edge pedestal of DIII-D H-mode plasmas

W. M. Stacey and R. J. Groebner
A procedure is described for evaluating particle pinches to be used in interpreting particle diffusion coefficients from measured density and temperature profiles in the edge pedestal of tokamak plasmas. Application to the interpretation of two DIII-D [J. Luxon, Nucl. Fusion 42, 614 (2002)]. dischar ... [Phys. Plasmas 16, 102504 (2009)] published Thu Oct 15, 2009.

A simple, analytical model of collisionless magnetic reconnection in a pair plasma

Michael Hesse, Seiji Zenitani, Masha Kuznetsova, and Alex Klimas
A set of conservation equations is utilized to derive balance equations in the reconnection diffusion region of a symmetric pair plasma. The reconnection electric field is assumed to have the function to maintain the current density in the diffusion region and to impart thermal energy to the plasma ... [Phys. Plasmas 16, 102106 (2009)] published Thu Oct 15, 2009.

Streamer-induced transport in electron temperature gradient turbulence

T. Hauff and F. Jenko
The question if and how streamers (i.e., radially elongated vortices) can lead to an enhancement of the electron heat transport in electron temperature gradient turbulence is addressed. To this aim, the electrons are treated as passive tracers, and their decorrelation mechanisms with respect to the ... [Phys. Plasmas 16, 102306 (2009)] published Thu Oct 15, 2009.

Dust kinetic Alfven and acoustic waves in a Lorentzian plasma

N. Rubab, N. V. Erkaev, and H. K. Biernat
Dust kinetic Alfven waves (DKAWs) with finite Larmor radius effects have been examined rigorously in a uniform dusty plasma in the presence of an external magnetic field. A dispersion relation of low-frequency DKAW on the dust acoustic velocity branch is obtained in a low-beta Lorentzian plasma. It ... [Phys. Plasmas 16, 103704 (2009)] published Thu Oct 15, 2009.

Sheath and presheath in plasma with warm ions

Scott Robertson
Numerical solutions are found for the potential profile of the presheath and sheath in plasma with a Maxwellian ion source distribution. Solutions are obtained for ratios of the electron temperature to ion source temperature from 0.1 to 10 for plasmas that are 20, 50, and 100 Debye lengths from the ... [Phys. Plasmas 16, 103503 (2009)] published Thu Oct 15, 2009.

Study of fast-electron transport in laser-illuminated spherical targets

B. Yaakobi, O. V. Gotchev, R. Betti, and C. Stoeckl
The transport and scattering of fast electrons created by the two-plasmon-decay instability are studied by comparing the hard x-ray signal from two identically irradiated targets: a 1-mm-diam solid Cu sphere and a 1-mm-diam solid CH sphere, both coated with a 15 [mu]m layer of CH. Comparing the res ... [Phys. Plasmas 16, 102703 (2009)] published Thu Oct 15, 2009.

Particle-in-cell and hypernetted chain models of two-component, two-temperature coupled classical plasmas

D. V. Rose, T. C. Genoni, D. R. Welch, R. E. Clark, R. B. Campbell et al.
Three-dimensional simulations of moderately to strongly coupled electron-ion and multicomponent classical plasmas using the particle-in-cell method are presented. The simulations resolve sub-Debye-length interparticle spacing to accurately model the dynamics of these systems. We consider realistic m ... [Phys. Plasmas 16, 102105 (2009)] published Thu Oct 15, 2009.

Nonlinear electrostatic excitations in a weakly relativistic electron-positron-ion rotating magnetoplasma

S. K. El-Labany, W. M. Moslem, and E. I. El-Awady
By using a hydrodynamic model, ZakharovKuznetsov (ZK) equation for a rotating magnetoplasma consisting of weakly relativistic electrons and positrons as well as stationary positive ions is derived. The existence condition as well as the pulse-shaped localized solution of the ZK equation are obtained ... [Phys. Plasmas 16, 102305 (2009)] published Tue Oct 13, 2009.

Simulation study of the magnetized sheath of a dusty plasma

G. Foroutan, H. Mehdipour, and H. Zahed
Numerical solutions of stationary multifluid equations are used to study the formation and properties of the magnetized sheath near the boundary of a dusty plasma. The impacts of the strength of the magnetic field, the dust and plasma number densities, and the electron temperature on the sheath stru ... [Phys. Plasmas 16, 103703 (2009)] published Mon Oct 12, 2009.

Orbit-averaged guiding-center FokkerPlanck operator

A. J. Brizard, J. Decker, Y. Peysson, and F.-X. Duthoit
A general orbit-averaged guiding-center FokkerPlanck operator suitable for the numerical analysis of transport processes in axisymmetric magnetized plasmas is presented. The orbit-averaged guiding-center operator describes transport processes in a three-dimensional guiding-center invariant space: th ... [Phys. Plasmas 16, 102304 (2009)] published Mon Oct 12, 2009.

Coupled flows and oscillations in asymmetric rotating plasmas

A. R. Karimov, L. Stenflo, and M. Y. Yu
Nonlinear coupling among the radial, axial, and azimuthal flows in an asymmetric cold rotating plasma is considered nonperturbatively. Exact solutions describing an expanding or contracting plasma with oscillations are then obtained. It is shown that despite the flow asymmetry the energy in the radi ... [Phys. Plasmas 16, 102303 (2009)] published Mon Oct 12, 2009.

Quasi-thermal noise in space plasma: kappa distributions

G. Le Chat, K. Issautier, N. Meyer-Vernet, I. Zouganelis, M. Maksimovic et al.
The transport of energy in collisionless plasmas, especially in space plasmas, is far from being understood. Measuring the temperature of the electrons and their nonthermal properties can give important clues to understand the transport properties. Quasi-thermal noise (QTN) spectroscopy is a reliabl ... [Phys. Plasmas 16, 102903 (2009)] published Fri Oct 9, 2009.

Effect of ion temperature on oblique propagation of large amplitude solitary kinetic Alfven waves

Prasanta Chatterjee, Taraknath Saha, S. V. Muniandy, and C. S. Wong
The effect of ion temperature on the existence of large amplitude solitary kinetic Alfven waves and double layers are investigated in a two-fluid model using Sagdeev's pseudopotential technique. The ion temperature, obliqueness parameter, and the ratio of cyclotron frequency to ion frequency are fou ... [Phys. Plasmas 16, 103702 (2009)] published Fri Oct 9, 2009.

Dressed electrostatic solitary excitations in three component pair-plasmas: Application in isothermal pair-plasma with stationary ions

A. Esfandyari-Kalejahi, M. Akbari-Moghanjoughi, and B. Haddadpour-Khiaban
In this work electrostatic solitary waves in a three component pair-plasma consisting of hot isothermal electrons (or negative fullerene ions), positrons (or positive fullerene ions), and stationary positive ions (say, dust particulates) are studied. Using reductive perturbation method, plasma fluid ... [Phys. Plasmas 16, 102302 (2009)] published Fri Oct 9, 2009.

Betatron x-ray generation from electrons accelerated in a plasma cavity in the presence of laser fields

A. G. R. Thomas and K. Krushelnick
X-ray generation by many charged particles experiencing accelerations similar to those in laser wakefield accelerator experiments, including the effects of the interaction of the laser pulse with trapped electrons, as well as betatron oscillations in an electron cavity, is directly evaluated. Semian ... [Phys. Plasmas 16, 103103 (2009)] published Fri Oct 9, 2009.

Weakly nonlinear ablative RayleighTaylor instability at preheated ablation front

Zhengfeng Fan, Jisheng Luo, and Wenhua Ye
Stuart's weakly nonlinear theory is generalized to study single-mode ablative RayleighTaylor instability (ARTI) at a broad ablation front caused by preheating. The thickness effect of the ablation front is considered and the spatial amplitude distributions of density, temperature, and velocity for h ... [Phys. Plasmas 16, 102104 (2009)] published Fri Oct 9, 2009.

Properties of microturbulence in toroidal plasmas with reversed magnetic shear

Wenjun Deng and Zhihong Lin
Electrostatic drift wave turbulence in tokamak plasmas with reversed magnetic shear is studied using global gyrokinetic particle simulations. The linear eigenmode of the ion temperature gradient (ITG) instability exhibits a mode gap around the minimum safety factor (q) region, particularly when q is ... [Phys. Plasmas 16, 102503 (2009)] published Thu Oct 8, 2009.

Shock wave in a two-dimensional dusty plasma crystal

Samiran Ghosh
Two-dimensional (2D) shock structures of longitudinal dust lattice wave (LDLW) in a hexagonal Yukawa crystal are studied. The nonlinear evolution equation derived for dusty plasma crystal is found to be a 2D Burgers' equation, where the Burgers' term, i.e., the dissipation is provided by hydrodynami ... [Phys. Plasmas 16, 103701 (2009)] published Thu Oct 8, 2009.

Bandgap characteristics of one-dimensional plasma photonic crystal

Yan Yin, Han Xu, M. Y. Yu, Yan-yun Ma, Hong-bin Zhuo et al.
When two pump laser pulses intersect in an underdense plasma, plasma Bragg grating (PBG) is induced by the slow-varying ponderomotive force [Z. M. Sheng et al., Appl. Phys. B: Lasers Opt. 77, 673 (2003)]. Such a PBG can be considered as a one-dimensional (1D) plasma photonic crystal (PPC). Here the ... [Phys. Plasmas 16, 102103 (2009)] published Thu Oct 8, 2009.

Azimuthally correlated ablation between z-pinch wire cores

J. C. Zier, J. D. Douglass, I. C. Blesener, K. S. Blesener, D. A. Chalenski et al.
Azimuthally correlated wire core ablation was compared for closely spaced versus widely spaced wires in a 1 MA Z-pinch. X-ray point-projection diagnostics revealed that 240 [mu]m spaced wires exhibited a correlation coefficient approaching unity in both real space and in k-space. This correlated ab ... [Phys. Plasmas 16, 102702 (2009)] published Thu Oct 8, 2009.

Pitch-angle diffusion of ions via nonresonant interaction with Alfvenic turbulence

P. H. Yoon, C. B. Wang, and C. S. Wu
The present discussion revisits the problem of nonresonant heating of ions by Alfvenic turbulence. It is shown that in the limit of weak Alfvenic turbulence it is appropriate to describe the nonresonant heating of protons as perpendicular pseudoheating. However, in a more general situation it is dem ... [Phys. Plasmas 16, 102102 (2009)] published Thu Oct 8, 2009.