Physics of Plasmas: All Topics http://scitation.aip.org/ Physics of Plasmas: All Topics Selective formation of turbulent structures in magnetized cylindrical plasmas http://link.aip.org/link/?PHP/15/052302/1&agg=rss Naohiro Kasuya, Masatoshi Yagi, Kimitaka Itoh, and Sanae-I Itoh<br/> The mechanism of nonlinear structural formation has been studied with a three-field reduced fluid model, which is extended to describe the resistive drift wave turbulence in magnetized cylindrical plasmas. In this model, ion-neutral collisions strongly stabilize the resistive drift wave, and the for ... [Phys. Plasmas 15, 052302 (2008)] published Fri May 16, 2008. Effects of flow shear and Alfv[e-acute]n waves on two-dimensional magnetohydrodynamic turbulence http://link.aip.org/link/?PHP/15/052301/1&agg=rss Jamie Douglas, Eun-jin Kim, and A. Thyagaraja<br/> The suppression of turbulent transport by large scale mean shear flows and uniform magnetic fields is investigated in two-dimensional magnetohydrodynamic turbulence driven by a small-scale forcing with finite correlation time. By numerical integration the turbulent magnetic diffusivity D is shown to ... [Phys. Plasmas 15, 052301 (2008)] published Thu May 15, 2008. Calculation of resistive magnetohydrodynamics and two-fluid tearing modes by example of reversed-field-pinch-like plasma http://link.aip.org/link/?PHP/15/052106/1&agg=rss V. A. Svidzinski and H. Li<br/> An algorithm suitable for numerical solution of linear eigenmode problems in resistive magnetohydrodynamics (MHD) and two-fluid MHD models without prior approximations is presented. For these plasma models, sets of equations suitable for numerical solution are derived and the details of the algorith ... [Phys. Plasmas 15, 052106 (2008)] published Thu May 15, 2008. Characterization of an atmospheric double arc argon-nitrogen plasma source http://link.aip.org/link/?PHP/15/053504/1&agg=rss X. Tu, B. G. Cheron, J. H. Yan, L. Yu, and K. F. Cen<br/> In the framework of studies devoted to hazardous waste destruction, an original dc double anode plasma torch has been designed and tested, which produces an elongated, weak fluctuation and reproducible plasma jet at atmospheric pressure. The arc instabilities and dynamic behavior of the double arc a ... [Phys. Plasmas 15, 053504 (2008)] published Wed May 14, 2008. Effect of electron nonthermality on nonlinear electrostatic solitary waves in a charge varying dusty plasma http://link.aip.org/link/?PHP/15/053702/1&agg=rss Mouloud Tribeche and Ghania Boumezoued<br/> The effect of nonthermal electrons with excess of fast energetic electrons on large amplitude electrostatic solitary waves is investigated in a charge varying dusty plasma. The correct nonthermal electron charging is investigated based on the orbit-motion-limited approach. It is found that the nonli ... [Phys. Plasmas 15, 053702 (2008)] published Mon May 12, 2008. Self-similar quasineutral expansion of a collisionless plasma with tailored electron temperature profile http://link.aip.org/link/?PHP/15/053103/1&agg=rss Naveen Kumar and Alexander Pukhov<br/> The self-similar expansion of a collisionless plasma, with an externally tailored electron temperature profile, is studied analytically in quasineutral approximation. It is shown that the tailoring of electron plasma temperature can lead to an ion bunch formation concentrated in phase space. Experim ... [Phys. Plasmas 15, 053103 (2008)] published Mon May 12, 2008. Comment on the drift mirror instability http://link.aip.org/link/?PHP/15/054502/1&agg=rss Petr Hellinger<br/> Drift mirror instability is investigated in a slightly inhomogeneous plasma in a low-frequency, long-wavelength limit of the VlasovMaxwell equation. It is shown that previously derived threshold conditions for the drift mirror instability in the case of one cold species are incorrect and that it is ... [Phys. Plasmas 15, 054502 (2008)] published Mon May 12, 2008. Modulational instability of magnetosonic waves in a spin 1/2 quantum plasma http://link.aip.org/link/?PHP/15/052105/1&agg=rss A. P. Misra and P. K. Shukla<br/> The modulational instability (MI) of magnetosonic waves (MSWs) is analyzed, by using a two-fluid quantum magnetohydrodynamic model that includes the effects of the electron-1/2 spin and the plasma resistivity. The envelope modulation is then studied by deriving the corresponding nonlinear Schrodinge ... [Phys. Plasmas 15, 052105 (2008)] published Mon May 12, 2008. Control of whistler radiation efficiency of a loop antenna by generation of ambient magnetic field irregularities http://link.aip.org/link/?PHP/15/053503/1&agg=rss M. E. Gushchin, S. V. Korobkov, A. V. Kostrov, A. V. Strikovsky, T. M. Zaboronkova et al.<br/> Electrodynamic means for the control of loop antenna radiation efficiency in plasma is proposed, which can be used in the whistler frequency band. The method is based on the generation, without perturbing the plasma density, of localized ambient magnetic field irregularities in the vicinity of the a ... [Phys. Plasmas 15, 053503 (2008)] published Fri May 9, 2008. Poloidal motion of trapped particle orbits in real-space coordinates http://link.aip.org/link/?PHP/15/052501/1&agg=rss V. V. Nemov, S. V. Kasilov, W. Kernbichler, and G. O. Leitold<br/> The bounce averaged poloidal drift velocity of trapped particles in stellarators is an important quantity in the framework of optimization of stellarators because it allows us to analyze the possibility for closure of contours of the second adiabatic invariant and therefore for improvement of alpha- ... [Phys. Plasmas 15, 052501 (2008)] published Fri May 9, 2008. Saturation of tearing modes in reversed field pinches with locally linear force-free magnetic fields and its application to quasi-single-helicity states http://link.aip.org/link/?PHP/15/052104/1&agg=rss E. Tassi, F. Militello, F. Porcelli, and R. J. Hastie<br/> A simple formula for predicting the width of a saturated island, formed as a consequence of tearing perturbation of linear force-free fields in cylindrical geometry, is derived. The formula makes it possible to calculate the saturated island width in terms of the values of parameters characterizing ... [Phys. Plasmas 15, 052104 (2008)] published Fri May 9, 2008. Ion acceleration by femtosecond laser pulses in small multispecies targets http://link.aip.org/link/?PHP/15/053102/1&agg=rss J. Psikal, V. T. Tikhonchuk, J. Limpouch, A. A. Andreev, and A. V. Brantov<br/> Ion acceleration by ultrashort intense femtosecond laser pulses (~4 x 10 W/cm, ~30 fs) in small targets of uniform chemical composition of two ion species (protons and carbon C ions) is studied theoretically via a particle-in-cell code with two spatial and three velocity components. Energy spectra ... [Phys. Plasmas 15, 053102 (2008)] published Thu May 8, 2008. Effect of island overlap on edge localized mode suppression by resonant magnetic perturbations in DIII-D http://link.aip.org/link/?PHP/15/056122/1&agg=rss M. E. Fenstermacher, T. E. Evans, T. H. Osborne, M. J. Schaffer, M. P. Aldan et al.<br/> Recent DIII-D [J. L. Luxon et al., Nucl. Fusion 43, 1813 (2003)] experiments show a correlation between the extent of overlap of magnetic islands induced in the edge plasma by perturbation coils and complete suppression of Type-I edge localized modes (ELMs) in plasmas with ITER-like electron pedesta ... [Phys. Plasmas 15, 056122 (2008)] published Thu May 8, 2008. Tearing instabilities driven by nonideal effects in the tail plasma sheet http://link.aip.org/link/?PHP/15/052901/1&agg=rss A. K. Sundaram<br/> Using an extended magnetohydrodynamic description, the excitation of tearing modes is analytically investigated in the tail plasma sheet region that includes the magnetic field components B(x,z) and B(x,z). Taking electron inertia and the Hall effect into account, a generalized technique is displaye ... [Phys. Plasmas 15, 052901 (2008)] published Thu May 8, 2008. Ion heating during reconnection in the Madison Symmetric Torus reversed field pinch http://link.aip.org/link/?PHP/15/056121/1&agg=rss S. Gangadhara, D. Craig, D. A. Ennis, D. J. Den Hartog, G. Fiksel et al.<br/> Measurements of localized ion heating during magnetic reconnection in the Madison Symmetric Torus reversed field pinch [R. N. Dexter, D. W. Kerst, T. W. Lovell, S. C. Prager, and J. C. Sprott, Fusion Technol. 19, 131 (1991)] are presented using two beam-based diagnostics: Charge exchange recombinati ... [Phys. Plasmas 15, 056121 (2008)] published Thu May 8, 2008. Hot electron generation from intense laser irradiation of microtipped cone and wedge targets http://link.aip.org/link/?PHP/15/052701/1&agg=rss B. I. Cho, G. M. Dyer, S. Kneip, S. Pikuz, D. R. Symes et al.<br/> X-ray production from the interaction of femtosecond laser pulses focused to relativistic intensity into re-entrant targets etched into silicon has been investigated. K and hard x-ray yields were compared when the laser was focused into pyramidal shaped cone targets and wedge shaped targets. Hot ele ... [Phys. Plasmas 15, 052701 (2008)] published Thu May 8, 2008. Active control of internal transport barrier formation due to off-axis electron-cyclotron heating in GAMMA 10 experiments http://link.aip.org/link/?PHP/15/056120/1&agg=rss T. Cho, V. P. Pastukhov, W. Horton, T. Numakura, M. Hirata et al.<br/> The controlled formation of an internal transport barrier (ITB) is observed in GAMMA 10 [T. Cho et al., Nucl. Fusion 45, 1650 (2005)]. The barrier is localized within a layer of a strongly sheared E x B plasma rotation (5.5<r<=10 cm). This high-vorticity layer is formed and maintained by off-axis e ... [Phys. Plasmas 15, 056120 (2008)] published Wed May 7, 2008. Structural features of bicomponent dust Coulomb balls formed by the superposition of fields of different origin in plasma http://link.aip.org/link/?PHP/15/053701/1&agg=rss S. G. Psakhie, K. P. Zolnikov, L. F. Skorentsev, D. S. Kryzhevich, and A. V. Abdrashitov<br/> A binary mixture of dust particles in plasma which are in an external electrostatic harmonic confining field as well as in the field consisting of gravitational, thermophoretic, and electrostatic force is simulated. The interparticle interaction is described by the Yukawa isotropic pair potential. T ... [Phys. Plasmas 15, 053701 (2008)] published Wed May 7, 2008. Laser beam-profile impression and target thickness impact on laser-accelerated protons http://link.aip.org/link/?PHP/15/053101/1&agg=rss M. Schollmeier, K. Harres, F. Nurnberg, A. Blazevic, P. Audebert et al.<br/> Experimental results on the influence of the laser focal spot shape onto the beam profile of laser-accelerated protons from gold foils are reported. The targets' microgrooved rear side, together with a stack of radiochromic films, allowed us to deduce the energy-dependent proton source-shape and siz ... [Phys. Plasmas 15, 053101 (2008)] published Wed May 7, 2008. Mini-Conference on the First Microns of the First Wall http://link.aip.org/link/?PHP/15/058303/1&agg=rss D. P. Stotler, T. D. Rognlien, and S. I. Krasheninnikov<br/> Interactions between plasmas and their surrounding materials (plasma-facing components) are of great interest to present and future magnetic fusion experiments, and ITER [ITER Physics Basis Editors, ITER Physics Expert Group Chairs, ITER Joint Central Team, and Physics Integration Unit, Nucl. Fusion ... [Phys. Plasmas 15, 058303 (2008)] published Mon May 5, 2008. Relationship between edge localized mode severity and electron transport in the National Spherical Torus Experiment http://link.aip.org/link/?PHP/15/056119/1&agg=rss K. Tritz, S. Kaye, R. Maingi, S. Sabbagh, D. Stutman et al.<br/> In the National Spherical Torus Experiment [J. Menard et al., Nucl. Fusion 47, S645 (2007)], giant edge localized modes (ELMs) can occur resulting in a loss of plasma stored energy of up to 30%. These events are distinct from type I ELMs, whose energy loss is typically 410%, and they are accompanied ... [Phys. Plasmas 15, 056119 (2008)] published Mon May 5, 2008. The effect of lithium surface coatings on plasma performance in the National Spherical Torus Experiment http://link.aip.org/link/?PHP/15/056118/1&agg=rss H. W. Kugel, M. G. Bell, J.-W. Ahn, J. P. Allain, R. Bell et al.<br/> National Spherical Torus Experiment [which M. Ono et al., Nucl. Fusion 40, 557 (2000)] high-power divertor plasma experiments have shown, for the first time, that benefits from lithium coatings applied to plasma facing components found previously in limited plasmas can occur also in high-power diver ... [Phys. Plasmas 15, 056118 (2008)] published Fri May 2, 2008. Energy of eigenmodes in magnetohydrodynamic flows of ideal fluids http://link.aip.org/link/?PHP/15/054501/1&agg=rss I. V. Khalzov, A. I. Smolyakov, and V. I. Ilgisonis<br/> Energy of eigenmodes in magnetohydrodynamic (MHD) flows of ideal fluids is studied analytically. It is shown that the energy of unstable modes is zero, while the energy of stable oscillatory modes (waves) can assume both positive and negative values. Negative energy waves always correspond to eigenm ... [Phys. Plasmas 15, 054501 (2008)] published Fri May 2, 2008. Nonaxisymmetric magnetorotational instability in ideal and viscous plasmas http://link.aip.org/link/?PHP/15/052103/1&agg=rss A. B. Mikhailovskii, J. G. Lominadze, R. M. O. Galvao, A. P. Churikov, N. N. Erokhin et al.<br/> The excitation of magnetorotational instability (MRI) in rotating laboratory plasmas is investigated. In contrast to astrophysical plasmas, in which gravitation plays an important role, in laboratory plasmas it can be neglected and the plasma rotation is equilibrated by the pressure gradient. The an ... [Phys. Plasmas 15, 052103 (2008)] published Fri May 2, 2008. Nonequilibrium dynamics of laser-generated plasma channels http://link.aip.org/link/?PHP/15/053501/1&agg=rss Tz. B. Petrova, H. D. Ladouceur, and A. P. Baronavski<br/> A time-dependent nonequilibrium kinetics model based upon the time-dependent electron Boltzmann equation coupled with an extensive air chemistry model accounting for gas heating and vibrational kinetics is developed. The model is applied to the temporal evolution of femtosecond laser-generated air p ... [Phys. Plasmas 15, 053501 (2008)] published Thu May 1, 2008. Exceptional points in linear gyrokinetics http://link.aip.org/link/?PHP/15/052102/1&agg=rss M. Kammerer, F. Merz, and F. Jenko<br/> When performing linear gyrokinetic simulations, it is found that various types of microinstabilities, which are usually considered as strictly separated, can actually be transformed into each other via continuous variations of the plasma parameters. This behavior can be explained in terms of so-call ... [Phys. Plasmas 15, 052102 (2008)] published Thu May 1, 2008. Study of the first pulse of Ne-Xe-HCl dielectric barrier discharge for the excimer lamp http://link.aip.org/link/?PHP/15/053502/1&agg=rss A. Belasri, S. Bendella, and T. Baba-Hamed<br/> A global one-dimensional model of a dielectric barrier discharge which includes the sheath region and the positive column was developed. The model was used to study the electrical properties under operating conditions of the vacuum ultraviolet excimer lamp and to understand the basic processes of pl ... [Phys. Plasmas 15, 053502 (2008)] published Thu May 1, 2008. Dynamics of the excitation of an upper hybrid wave by a rippled laser beam in magnetoplasma http://link.aip.org/link/?PHP/15/052101/1&agg=rss Gunjan Purohit, P. K. Chauhan, and R. P. Sharma<br/> This paper presents the effects of a laser spike (superimposed on an intense laser beam) and a static magnetic field on the excitation of the upper hybrid wave (UHW) in a hot collisionless magnetoplasma, taking into account the relativistic nonlinearity. The laser beam is propagating perpendicular t ... [Phys. Plasmas 15, 052101 (2008)] published Thu May 1, 2008. On description of magnetic stochasticity in poloidal divertor tokamaks http://link.aip.org/link/?PHP/15/042508/1&agg=rss S. S. Abdullaev, M. Jakubowski, M. Lehnen, O. Schmitz, and B. Unterberg<br/> A generic approach to study the stochastic field lines formed near the magnetic separatrix of poloidal divertor tokamaks due to nonaxisymmetric magnetic perturbations is proposed. The method is based on the determination of the so-called Poincare integral [S. S. Abdullaev, Phys. Rev. E 70, 046202 (2 ... [Phys. Plasmas 15, 042508 (2008)] published Wed Apr 30, 2008. Observations of vertically propagating driven dust acoustic waves: Finite temperature effects http://link.aip.org/link/?PHP/15/043704/1&agg=rss Jeremiah D. Williams, Edward Thomas, Jr., and Lydia Marcus<br/> In this study, the first measurement of the dispersion relationship for a vertically propagating (i.e., parallel to gravity), driven dust acoustic wave is reported. Finite dust temperature effects were observed in the dispersion relation of the dust acoustic wave. ... [Phys. Plasmas 15, 043704 (2008)] published Wed Apr 30, 2008. Ion current on a small spherical attractive probe in a weakly ionized plasma with ion-neutral collisions (kinetic approach) http://link.aip.org/link/?PHP/15/043705/1&agg=rss A. V. Zobnin, A. D. Usachev, O. F. Petrov, and V. E. Fortov<br/> The ion flux on a small attractive sphere (the sphere radius is much less than the Debye length) and the electric potential distribution around the sphere charged in a stationary weakly ionized plasma are calculated by the direct solution of the kinetic equation with the BhatnagarGrossKrook collisio ... [Phys. Plasmas 15, 043705 (2008)] published Wed Apr 30, 2008. Influence of the radio frequency ponderomotive force on anomalous impurity transport in tokamaks http://link.aip.org/link/?PHP/15/042316/1&agg=rss H. Nordman, R. Singh, T. Fulop, L.-G. Eriksson, R. Dumont et al.<br/> Trace impurity transport in tokamaks is studied using an electrostatic, collisionless fluid model for ion-temperature-gradient and trapped-electron mode driven turbulence in the presence of radio frequency (rf) fields, and the results are compared with neoclassical predictions. It is shown that the ... [Phys. Plasmas 15, 042316 (2008)] published Wed Apr 30, 2008. Solution for space charge limited field emission current densities with injection velocity and geometric effects corrections http://link.aip.org/link/?PHP/15/043301/1&agg=rss Y. Feng, J. P. Verboncoeur, and M. C. Lin<br/> When particles are injected according to the FowlerNordheim (FN) field emission equation, the transmitted current density will transition to the space charge limited (SCL) current density, with increasing applied diode voltage. The actual transmitted current density is the so-called SCL-FN current d ... [Phys. Plasmas 15, 043301 (2008)] published Wed Apr 30, 2008. Ion streaming instability in a quantum dusty magnetoplasma http://link.aip.org/link/?PHP/15/044503/1&agg=rss Nitin Shukla, P. K. Shukla, G. Brodin, and L. Stenflo<br/> It is shown that a relative drift between the ions and the charged dust particles in a magnetized quantum dusty plasma can produce an oscillatory instability in a quantum dust acousticlike wave. The threshold and growth rate of the instability are presented. The result may explain the origin of low- ... [Phys. Plasmas 15, 044503 (2008)] published Wed Apr 30, 2008. Ambipolar acceleration of ions in a magnetic nozzle http://link.aip.org/link/?PHP/15/042109/1&agg=rss Alexey V. Arefiev and Boris N. Breizman<br/> This paper describes a magnetic nozzle with a magnetic mirror configuration that transforms a collisionless subsonic plasma flow into a supersonic jet expanding into the vacuum. The nozzle converts electron thermal energy into the ion kinetic energy via an ambipolar electric field. The ambipolar pot ... [Phys. Plasmas 15, 042109 (2008)] published Wed Apr 30, 2008. Analyses of laser-plasma interactions in National Ignition Facility ignition targets http://link.aip.org/link/?PHP/15/056314/1&agg=rss D. E. Hinkel, D. A. Callahan, A. B. Langdon, S. H. Langer, C. H. Still et al.<br/> A capability to analyze laser-plasma interactions (LPI) for ignition targets to be fielded at the National Ignition Facility has been developed and exercised. LPI in these targets may cause direct energy loss (backscatter) or energy redirection (beam spray, deflection, and energy transfer). These an ... [Phys. Plasmas 15, 056314 (2008)] published Tue Apr 29, 2008. Three-dimensional modeling of laser-plasma interaction: Benchmarking our predictive modeling tools versus experiments http://link.aip.org/link/?PHP/15/056313/1&agg=rss L. Divol, R. L. Berger, N. B. Meezan, D. H. Froula, S. Dixit et al.<br/> New experimental capabilities [Froula et al., Phys. Rev. Lett. 98, 085001 (2007)] have been developed to study laser-plasma interaction (LPI) in ignition-relevant condition at the Omega laser facility (LLE/Rochester). By shooting an interaction beam along the axis of a gas-filled hohlraum heated by ... [Phys. Plasmas 15, 056313 (2008)] published Tue Apr 29, 2008. Progress in direct-drive inertial confinement fusion http://link.aip.org/link/?PHP/15/055503/1&agg=rss R. L. McCrory, D. D. Meyerhofer, R. Betti, R. S. Craxton, J. A. Delettrez et al.<br/> Significant progress in direct-drive inertial confinement fusion (ICF) research has been made since the completion of the 60-beam, 30-kJ OMEGA Laser System [Boehly, Opt. Commun. 133, 495 (1997)] in 1995. A theory of ignition requirements, applicable to any ICF concept, has been developed. Detailed u ... [Phys. Plasmas 15, 055503 (2008)] published Tue Apr 29, 2008. Formation of thin bifurcated current sheets by quasisteady compression http://link.aip.org/link/?PHP/15/042902/1&agg=rss Karl Schindler and Michael Hesse<br/> Thin current sheets with half-widths in the range of about 10 or less ion inertial lengths (or ion gyroradii) have been identified as the sites of important dynamical phenomena in space plasmas. Recent space observations established that thin current sheets often have a bifurcated (double-peaked) cu ... [Phys. Plasmas 15, 042902 (2008)] published Tue Apr 29, 2008. Erratum: ``Electron beam instabilities in unmagnetized plasmas via the Stieltjes transform (linear theory and nonlinear mode coupling)'' [Phys. Plasmas [bold 14], 112105 (2007)] http://link.aip.org/link/?PHP/15/049902/1&agg=rss S. Krishan<br/> ... [Phys. Plasmas 15, 049902 (2008)] published Tue Apr 29, 2008. Beat excitation of whistlers in the presence of field aligned irregularities in the ionosphere http://link.aip.org/link/?PHP/15/042901/1&agg=rss M. S. Sodha, Lalita Bhasin, and V. K. Tripathi<br/> In equatorial ionospheric plasma, embedded with a density ripple, a low frequency whistler can be resonantly excited by the nonlinear mixing of two high frequency radio waves launched from the ground at an oblique angle. A suitable configuration is where the earth magnetic field is along z-hat (hori ... [Phys. Plasmas 15, 042901 (2008)] published Tue Apr 29, 2008. The toroidal momentum diffusivity in a tokamak plasma: A comparison of fluid and kinetic calculations http://link.aip.org/link/?PHP/15/044502/1&agg=rss D. Strintzi, A. G. Peeters, and J. Weiland<br/> Fluid and gyrokinetic calculations of the toroidal momentum diffusivity in a tokamak are compared. The four-moment gyrofluid model predicts the Prandtl number connected with the ion temperature gradient mode reasonably well provided the drift term is kept in the momentum balance. Without the drift t ... [Phys. Plasmas 15, 044502 (2008)] published Tue Apr 29, 2008. Stopping power and range of energetic electrons in dense plasmas of fast-ignition fusion targets http://link.aip.org/link/?PHP/15/042707/1&agg=rss A. A. Solodov and R. Betti<br/> Current theoretical predictions of the stopping range of fast electrons in the dense cores of fast-ignition fusion targets differ by about a factor of 2. Inconsistencies in the previous derivations are discussed and correct values of the stopping power, scattering coefficients, and ranges of fast el ... [Phys. Plasmas 15, 042707 (2008)] published Tue Apr 29, 2008. On the influence of initial state on gyrokinetic simulations http://link.aip.org/link/?PHP/15/042315/1&agg=rss G. Dif-Pradalier, V. Grandgirard, Y. Sarazin, X. Garbet, Ph. Ghendrih et al.<br/> The influence of the initial state on the turbulence and transport is addressed in collisionless, global, and full-f gyrokinetic simulations solving both the equilibrium and the fluctuations. For two strongly differing initial states, it is found that the steady turbulent regime exhibits nearly iden ... [Phys. Plasmas 15, 042315 (2008)] published Mon Apr 28, 2008. Lower hybrid current drive experiments on Alcator C-Mod: Comparison with theory and simulation http://link.aip.org/link/?PHP/15/056117/1&agg=rss P. T. Bonoli, J. Ko, R. Parker, A. E. Schmidt, G. Wallace et al.<br/> Lower hybrid (LH) current drive experiments have been carried out on the Alcator C-Mod tokamak [I. H. Hutchinson et al., Phys. Plasmas 1, 1511 (1994)] using a radio-frequency system at 4.6 GHz. Up to 900 kW of LH power has been coupled and driven LH currents have been inferred from magnetic measur ... [Phys. Plasmas 15, 056117 (2008)] published Fri Apr 25, 2008. Observations and analysis of magnetic fluctuations in the Maryland centrifugal experiment http://link.aip.org/link/?PHP/15/042507/1&agg=rss S. Choi, P. N. Guzdar, A. Case, R. Ellis, A. B. Hassam et al.<br/> Initial results from magnetic probes on the Maryland Centrifugal eXperiment (MCX) [R. F. Ellis et al., Phys. Plasmas 8, 2057 (2001)] provide details of the propagation and azimuthal mode structure of magnetic fluctuations in the edge region. Magnetic coils placed azimuthally along the edge measure c ... [Phys. Plasmas 15, 042507 (2008)] published Fri Apr 25, 2008. Simulation of alpha-channeling in mirror machines http://link.aip.org/link/?PHP/15/042506/1&agg=rss A. I. Zhmoginov and N. J. Fisch<br/> Applying alpha-channeling techniques to mirror machines can significantly increase their effective reactivity, thus making open configurations more advantageous for practical fusion. A large fraction of alpha-particle energy can be extracted using rf waves. Effects employed to cool alpha particles c ... [Phys. Plasmas 15, 042506 (2008)] published Fri Apr 25, 2008. Waves in a bounded two component electron-dust plasma http://link.aip.org/link/?PHP/15/043703/1&agg=rss Shi-Ling Tian, Rong-An Tang, and Ju-Kui Xue<br/> Taking into account the boundary, the dust charge variation, the dust size and particle density effects, waves in a two component electron-dust plasma, bounded by a cylindrical domain, are presented. The dispersion relation for the waves is obtained and investigated analytically. Some limiting cases ... [Phys. Plasmas 15, 043703 (2008)] published Fri Apr 25, 2008. Low frequency electrostatic waves in weakly inhomogeneous magnetoplasma modeled by Lorentzian (kappa) distributions http://link.aip.org/link/?PHP/15/042108/1&agg=rss B. Basu<br/> Linear dispersion relations for electrostatic waves in spatially inhomogeneous, current-carrying anisotropic plasma, where the equilibrium particle velocity distributions are modeled by various Lorentzian (kappa) distributions and by well-known bi-Maxwellian distribution, are presented. Spatial inho ... [Phys. Plasmas 15, 042108 (2008)] published Fri Apr 25, 2008. A novel method to construct stationary solutions of the Vlasov--Maxwell system http://link.aip.org/link/?PHP/15/042107/1&agg=rss Akihiro Suzuki and Toshikazu Shigeyama<br/> A novel method to derive stationary solutions of the VlasovMaxwell system is established. This method is based on the assumption that the deviation of the velocity distribution from the MaxwellBoltzmann distribution can be expanded by the Hermite polynomials. By applying our method, a new two-dimens ... [Phys. Plasmas 15, 042107 (2008)] published Thu Apr 24, 2008. Statistical properties of ideal three-dimensional Hall magnetohydrodynamics: The spectral structure of the equilibrium ensemble http://link.aip.org/link/?PHP/15/042314/1&agg=rss Sergio Servidio, William H. Matthaeus, and Vincenzo Carbone<br/> The nonlinear dynamics of ideal, incompressible Hall magnetohydrodynamics (HMHD) is investigated through classical Gibbs ensemble methods applied to the finite Galerkin representation. The spectral structure of HMHD is derived in a three-dimensional periodic geometry and compared with the MHD case. ... [Phys. Plasmas 15, 042314 (2008)] published Thu Apr 24, 2008. Experimental study on the velocity limits of magnetized rotating plasmas http://link.aip.org/link/?PHP/15/042504/1&agg=rss C. Teodorescu, R. Clary, R. F. Ellis, A. B. Hassam, R. Lunsford et al.<br/> An experimental study on the physical limits of the rotation velocity of magnetized plasmas is presented. Experiments are performed in the Maryland Centrifugal Experiment (MCX) [R. F. Ellis et al., Phys. Plasmas 12, 055704 (2005)], a mirror magnetic field plasma rotating azimuthally. The externally ... [Phys. Plasmas 15, 042504 (2008)] published Thu Apr 24, 2008. Three-dimensional magnetohydrodynamical simulation of expanding magnetic flux ropes http://link.aip.org/link/?PHP/15/042106/1&agg=rss L. Arnold, J. Dreher, R. Grauer, H. Soltwisch, and H. Stein<br/> Three-dimensional, time-dependent numerical simulations of the dynamics of magnetic flux ropes are presented. The simulations are targeted towards an experiment previously conducted at California Institute of Technology [P. M. Bellan and J. F. Hansen, Phys. Plasmas 5, 1991 (1998)] which aimed at sim ... [Phys. Plasmas 15, 042106 (2008)] published Thu Apr 24, 2008. Global axisymmetric simulations of two-fluid reconnection in an experimentally relevant geometry http://link.aip.org/link/?PHP/15/042313/1&agg=rss N. A. Murphy and C. R. Sovinec<br/> To address the interplay between local and global effects in magnetic reconnection, axisymmetric numerical simulations for the Magnetic Reconnection Experiment [M. Yamada et al., Phys. Plasmas 4, 1936 (1997)] are performed using the NIMROD code [C. R. Sovinec et al., J. Comput. Phys. 195, 355 (2004) ... [Phys. Plasmas 15, 042313 (2008)] published Thu Apr 24, 2008. Adiabatic model and design of a translating field reversed configuration http://link.aip.org/link/?PHP/15/042505/1&agg=rss T. P. Intrator, R. E. Siemon, and P. E. Sieck<br/> We apply an adiabatic evolution model to predict the behavior of a field reversed configuration (FRC) during decompression and translation, as well as during boundary compression. Semi-empirical scaling laws, which were developed and benchmarked primarily for collisionless FRCs, are expected to rema ... [Phys. Plasmas 15, 042505 (2008)] published Thu Apr 24, 2008. Effect of the induced-dipole force on charging rates of aerosol particles http://link.aip.org/link/?PHP/15/040702/1&agg=rss Scott Robertson and Zoltan Sternovsky<br/> Natanson's model {Zh. Tekh. Fiz., 30, 573 (1960) [English translation: Sov. Phys. Tech. Phys. 5, 538 (1960)]} for the collection of ions by aerosol particles is modified so that both the Coulomb force and the induced-dipole force are included for the case of attractive aerosol particles. Natanson in ... [Phys. Plasmas 15, 040702 (2008)] published Thu Apr 24, 2008. Measurements of core electron temperature and density fluctuations in DIII-D and comparison to nonlinear gyrokinetic simulations http://link.aip.org/link/?PHP/15/056116/1&agg=rss A. E. White, L. Schmitz, G. R. McKee, C. Holland, W. A. Peebles et al.<br/> For the first time, profiles (0.3<rho<0.9) of electron temperature and density fluctuations in a tokamak have been measured simultaneously and the results compared to nonlinear gyrokinetic simulations. Electron temperature and density fluctuations measured in neutral beam-heated, sawtooth-free low c ... [Phys. Plasmas 15, 056116 (2008)] published Tue Apr 22, 2008. Effects of dust size distribution on dust acoustic waves in two-dimensional unmagnetized dusty plasma http://link.aip.org/link/?PHP/15/043702/1&agg=rss Guang-jun He, Wen-shan Duan, and Duo-xiang Tian<br/> For unmagnetized dusty plasma with many different dust grain species containing both hot isothermal electrons and ions, both the linear dispersion relation and the KadomtsevPetviashvili equation for small, but finite amplitude dust acoustic waves are obtained. The linear dispersion relation is inves ... [Phys. Plasmas 15, 043702 (2008)] published Tue Apr 22, 2008. Nonlinear electron magnetohydrodynamics physics. III. Electron energization http://link.aip.org/link/?PHP/15/042309/1&agg=rss K. D. Strohmaier, J. M. Urrutia, and R. L. Stenzel<br/> Wave-particle interactions of low-frequency whistler modes with wave magnetic fields exceeding the ambient field are investigated experimentally. These highly nonlinear modes are excited with magnetic loop antennas in a large magnetized afterglow plasma. While the nonlinear wave properties are descr ... [Phys. Plasmas 15, 042309 (2008)] published Tue Apr 22, 2008. Langmuir wave filamentation instability http://link.aip.org/link/?PHP/15/042311/1&agg=rss Harvey A. Rose and L. Yin<br/> A Langmuir wave (LW) model is constructed whose equilibria are consistent with stimulated Raman scatter optimization, with Hamiltonian dynamics, and with rotational invariance. Linear instability analysis includes terms to all orders in wave amplitude and fluctuation wavenumber expansions, deltak. R ... [Phys. Plasmas 15, 042311 (2008)] published Tue Apr 22, 2008. Turbulence and transport in two-dimensional magnetized electron plasmas http://link.aip.org/link/?PHP/15/042312/1&agg=rss Dastgeer Shaikh and P. K. Shukla<br/> Electron plasmas confined by an external magnetic field exhibit variations in a two-dimensional plane orthogonal to the confining magnetic field. A nonlinear fluid simulation code to investigate the properties of 2D electron plasma wave turbulence in a nonuniform magnetoplasma has been developed. It ... [Phys. Plasmas 15, 042312 (2008)] published Tue Apr 22, 2008. Nonlinear electron magnetohydrodynamics physics. II. Wave propagation and wave-wave interactions http://link.aip.org/link/?PHP/15/042308/1&agg=rss J. M. Urrutia, R. L. Stenzel, and K. D. Strohmaier<br/> The propagation of low-frequency whistler modes with wave magnetic field exceeding the ambient field is investigated experimentally. Such nonlinear waves are excited with magnetic loop antennas whose axial field is aligned with the background magnetic field and greatly exceeds its strength. The osci ... [Phys. Plasmas 15, 042308 (2008)] published Tue Apr 22, 2008. Temperature ratio dependence of ion temperature gradient and trapped electron mode instability thresholds http://link.aip.org/link/?PHP/15/042310/1&agg=rss Alessandro Casati, C. Bourdelle, X. Garbet, and F. Imbeaux<br/> The impact of ion to electron temperature ratio T/T on the instability thresholds of ion temperature gradient (ITG) and trapped electron modes (TEMs) is both analytically and numerically addressed. An analytical kinetic approach is developed accounting for the ion (electron, respectively) magnetic d ... [Phys. Plasmas 15, 042310 (2008)] published Tue Apr 22, 2008. Global convective cell formation in pair-ion plasmas http://link.aip.org/link/?PHP/15/044501/1&agg=rss J. Vranjes and S. Poedts<br/> The global electrostatic mode in pair-ion plasmas is discussed for cylindric geometry and for a radially inhomogeneous equilibrium density. In the case of a Gaussian radial density profile, exact analytical eigensolutions are found in terms of the Kummer confluent hypergeometric functions. The mode ... [Phys. Plasmas 15, 044501 (2008)] published Tue Apr 22, 2008. Inhibition of fast electron energy deposition due to preplasma filling of cone-attached targets http://link.aip.org/link/?PHP/15/042706/1&agg=rss S. D. Baton, M. Koenig, J. Fuchs, A. Benuzzi-Mounaix, P. Guillou et al.<br/> We present experimental and numerical results on the propagation and energy deposition of laser-generated fast electrons into conical targets. The first part reports on experimental measurements performed in various configurations in order to assess the predicted benefit of conical targets over stan ... [Phys. Plasmas 15, 042706 (2008)] published Tue Apr 22, 2008. Nonlinear electron magnetohydrodynamics physics. I. Whistler spheromaks, mirrors, and field reversed configurations http://link.aip.org/link/?PHP/15/042307/1&agg=rss R. L. Stenzel, J. M. Urrutia, and K. D. Strohmaier<br/> The nonlinear interactions of time-varying magnetic fields with plasmas is investigated in the regime of electron magnetohydrodynamics. Simple magnetic field geometries are excited in a large laboratory plasma with a loop antenna driven with large oscillatory currents. When the axial loop field oppo ... [Phys. Plasmas 15, 042307 (2008)] published Tue Apr 22, 2008. Resonance penetration of intense femtosecond laser pulses through ultrathin foils http://link.aip.org/link/?PHP/15/043104/1&agg=rss N. V. Bordyuh and V. P. Krainov<br/> Transmission coefficient for penetration of intense femtosecond laser pulse through ultrathin foils with the thickness of the order of 30100 nm has been derived using the VlasovBoltzmann equation as a function of foil thickness. It is found that this coefficient oscillates resonantly if the transve ... [Phys. Plasmas 15, 043104 (2008)] published Mon Apr 21, 2008. A simple theoretical approach to calculate the electrical conductivity of nonideal copper plasma http://link.aip.org/link/?PHP/15/042705/1&agg=rss Mofreh R. Zaghloul<br/> A simple theoretical approach to calculate the electrical conductivity of partially ionized nonideal copper plasma is introduced. The densities of plasma species are calculated, to machine accuracy, including electronic excitation and allowing for high ionization states up to the atomic number of th ... [Phys. Plasmas 15, 042705 (2008)] published Mon Apr 21, 2008. Time-resolved absorption in cryogenic and room-temperature direct-drive implosions http://link.aip.org/link/?PHP/15/056312/1&agg=rss W. Seka, D. H. Edgell, J. P. Knauer, J. F. Myatt, A. V. Maximov et al.<br/> Time-dependent and time-integrated absorption fractions are inferred from scattered-light measurements in room-temperature and cryogenic direct-drive-implosion experiments on OMEGA. The measurements agree reasonably well with hydrodynamic simulations that include nonlocal electron-heat transport. Di ... [Phys. Plasmas 15, 056312 (2008)] published Mon Apr 21, 2008. Fast ignitor target studies for the HiPER project http://link.aip.org/link/?PHP/15/056311/1&agg=rss S. Atzeni, A. Schiavi, J. J. Honrubia, X. Ribeyre, G. Schurtz et al.<br/> Target studies for the proposed High Power Laser Energy Research (HiPER) facility [M. Dunne, Nature Phys. 2, 2 (2006)] are outlined and discussed. HiPER will deliver a 3omega (wavelength lambda=0.35 [mu]m), multibeam, multi-ns pulse of about 250 kJ and a 2omega or 3omega pulse of 70100 kJ in abou ... [Phys. Plasmas 15, 056311 (2008)] published Mon Apr 21, 2008. Performance of direct-drive cryogenic targets on OMEGA http://link.aip.org/link/?PHP/15/056310/1&agg=rss V. N. Goncharov, T. C. Sangster, P. B. Radha, R. Betti, T. R. Boehly et al.<br/> The success of direct-drive-ignition target designs depends on two issues: the ability to maintain the main fuel adiabat at a low level and the control of the nonuniformity growth during the implosion. A series of experiments was performed on the OMEGA Laser System [T. R. Boehly, D. L. Brown, R. S. ... [Phys. Plasmas 15, 056310 (2008)] published Mon Apr 21, 2008. Effect of dust on an amplitude modulated electromagnetic beam in a plasma http://link.aip.org/link/?PHP/15/043701/1&agg=rss Suresh C. Sharma, Ajay Gahlot, and R. P. Sharma<br/> A large amplitude modulated Gaussian electromagnetic beam propagating in a dusty plasma has been studied. The electrons are heated nonuniformly by the beam. For the nonsteady state, we obtain nonlinear current density in the presence of dust grains. This expression has been used to study the nonstat ... [Phys. Plasmas 15, 043701 (2008)] published Fri Apr 18, 2008. Two-stream instability in free electron lasers with a planar wiggler and an axial guide magnetic field http://link.aip.org/link/?PHP/15/043103/1&agg=rss H. Mehdian, S. Saviz, and A. Hasanbeigi<br/> The linearized theory of two-stream free electron lasers (FELs) consisting of a relativistic electron beam transported along the axis of a planar wiggler in the presence of an axial guiding magnetic field is proposed and investigated. The dispersion relation is derived employing linear fluid theory. ... [Phys. Plasmas 15, 043103 (2008)] published Fri Apr 18, 2008. Magnetic nozzle and plasma detachment model for a steady-state flow http://link.aip.org/link/?PHP/15/057103/1&agg=rss B. N. Breizman, M. R. Tushentsov, and A. V. Arefiev<br/> Plasma propulsion concepts that employ a guiding magnetic field raise the question of how the magnetically controlled plasma can detach from the spacecraft. This paper presents a detachment scenario relevant to high-power thrusters in which the plasma can stretch the magnetic field lines to infinity ... [Phys. Plasmas 15, 057103 (2008)] published Thu Apr 17, 2008.