POP: Letters and Brief Communications http://scitation.aip.org/ POP: Letters and Brief Communications The reflex gyrotron http://link.aip.org/link/?PHP/19/024505/1&agg=rss A. L. Goldenberg, A. V. Savilov, and V. K. Yulpatov<br/> A typical problem of low-power short-wavelength gyrotrons is that a too long cavity is required to provide the start of rf oscillations. Therefore, it is attractive to realize a gyrotron with a long enough operating region but relatively low diffraction Q-factor of the operating cavity. In this work ... [Phys. Plasmas 19, 024505 (2012)] published Thu Feb 9, 2012. Changes in density fluctuations as a result of resonant magnetic perturbations correlate with the density inverse scale length http://link.aip.org/link/?PHP/19/024504/1&agg=rss S. Mordijck, R. A. Moyer, and G. R. McKee<br/> In this paper we show that the changes in ion-scale density fluctuations n/n induced by resonant magnetic perturbations (RMPs) exhibit the same trends as modifications to the inverse density scale length, a/L in the pedestal area. In a series of ITER similar shape (ISS) H-mode discharges in DIII-D, ... [Phys. Plasmas 19, 024504 (2012)] published Thu Feb 9, 2012. Dynamic mitigation of instabilities http://link.aip.org/link/?PHP/19/024503/1&agg=rss S. Kawata<br/> In the paper Phys. Plasmas 18, 092705 (2011), dynamic stabilization mechanism for the Rayleigh-Taylor instability was discussed together with another dynamic migration mechanism, which we proposed and is discussed further in a more general way in this paper. In general, a perturbation of physical qu ... [Phys. Plasmas 19, 024503 (2012)] published Mon Feb 6, 2012. Analysis on the exclusiveness of turbulence suppression between static and time-varying shear flow http://link.aip.org/link/?PHP/19/020701/1&agg=rss Y. Z. Zhang, T. Xie, and S. M. Mahajan<br/> The analytical theory of turbulence suppression by shear flow [Y. Z. Zhang and S. M. Mahajan, Phys. Fluids B 4, 1385 (1992)] is extended to analyze the combined actions of flows that have time-varying as well as static components. It is found that each component, appearing alone, may yield the same ... [Phys. Plasmas 19, 020701 (2012)] published Fri Feb 3, 2012. Amended conjecture on an upper bound to time-dependent space-charge limited current http://link.aip.org/link/?PHP/19/024502/1&agg=rss M. E. Griswold, N. J. Fisch, and J. S. Wurtele<br/> Notwithstanding the recent conjecture that the upper bound on the time-averaged current across a space-charge-limited diode is equal to the steady state Child-Langmuir limit (J), Zhu and Ang used a one-dimensional (1D) particle in cell (PIC) code to show that in the regime where space charge effects ... [Phys. Plasmas 19, 024502 (2012)] published Wed Feb 1, 2012. Density dependence of capillary plasma on the pressure and applied voltage http://link.aip.org/link/?PHP/19/024501/1&agg=rss Han S. Uhm, Dong G. Jang, Min S. Kim, and Hyyong Suk<br/> Based on a simple theoretical model, the density properties of the electrical discharge in a capillary plasma system are investigated in terms of the hydrogen pressure and applied voltage. The electron density in the capillary during the electrical discharge is calculated from a theoretical model an ... [Phys. Plasmas 19, 024501 (2012)] published Wed Feb 1, 2012. Coupled modes in magnetized dense plasma with relativistic-degenerate electrons http://link.aip.org/link/?PHP/19/014506/1&agg=rss S. A. Khan<br/> Low frequency electrostatic and electromagnetic waves are investigated in ultra-dense quantum magnetoplasma with relativistic-degenerate electron and non-degenerate ion fluids. The dispersion relation is derived for mobile as well as immobile ions by employing hydrodynamic equations for such plasma ... [Phys. Plasmas 19, 014506 (2012)] published Thu Jan 26, 2012. Symmetries of resistive two-fluid magnetohydrodynamics under reversals of toroidal field, current, and rotation http://link.aip.org/link/?PHP/19/014505/1&agg=rss N. M. Ferraro<br/> The discrete symmetries of time-dependent, non-axisymmetric, two-fluid magnetohydrodynamics (MHD) equations are considered. Solutions of the time-independent, axisymmetric, ideal-MHD equations remain solutions under reversals of the toroidal field, current density, or rotation. Introducing non-axisy ... [Phys. Plasmas 19, 014505 (2012)] published Thu Jan 26, 2012. International thermonuclear experimental reactor-like extended Solovev equilibria with parallel flow http://link.aip.org/link/?PHP/19/014504/1&agg=rss G. N. Throumoulopoulos and H. Tasso<br/> A Solovev-like equilibrium solution is extended to plasmas with incompressible flow parallel to the magnetic field. ITER-like configurations are constructed for Alfven Mach functions peaked either on or off the magnetic axis. The linear stability of the equilibrium is also examined by applying a suf ... [Phys. Plasmas 19, 014504 (2012)] published Thu Jan 26, 2012. The effect of elementary reactions on solitary waves in dusty plasmas http://link.aip.org/link/?PHP/19/014503/1&agg=rss A. Tahraoui and R. Annou<br/> The conditions of existence of solitons have been determined by Wang et al. [Phys. Lett. A 339, 96 (2005)], in negative ions containing dusty plasmas where Boltzmannian ions and electrons are assumed. The study is revisited taking into account actual elementary reactions in plasma conditions, viz., ... [Phys. Plasmas 19, 014503 (2012)] published Mon Jan 23, 2012. Particle beam self-modulation instability in tapered and inhomogeneous plasma http://link.aip.org/link/?PHP/19/010703/1&agg=rss C. B. Schroeder, C. Benedetti, E. Esarey, F. J. Gruner, and W. P. Leemans<br/> The particle beam self-modulation instability in tapered and inhomogeneous plasmas is analyzed via an evolution equation for the beam radius. For a sufficiently fast taper, the instability is suppressed, and the condition for growth suppression is derived. The form of the taper to phase lock a trail ... [Phys. Plasmas 19, 010703 (2012)] published Mon Jan 23, 2012. A Maxwell formulation for the equations of a plasma http://link.aip.org/link/?PHP/19/010702/1&agg=rss Richard J. Thompson and Trevor M. Moeller<br/> In light of the analogy between the structure of electrodynamics and fluid dynamics, the fluid equations of motion may be reformulated as a set of Maxwell equations. This analogy has been explored in the literature for incompressible turbulent flow and compressible flow but has not been widely explo ... [Phys. Plasmas 19, 010702 (2012)] published Wed Jan 11, 2012. Quantum dynamic screening effects on the elastic collisions in strongly coupled semiclassical plasmas http://link.aip.org/link/?PHP/19/014502/1&agg=rss Chang-Geun Kim and Young-Dae Jung<br/> The quantum dynamic screening effects on the elastic electron-ion collisions are investigated in strongly coupled semiclassical plasmas. The second-order eikonal analysis with the impact parameter method is applied to obtain the eikonal phase shift and eikonal cross section as functions of the impac ... [Phys. Plasmas 19, 014502 (2012)] published Fri Jan 6, 2012. Chorus wave amplification: A free electron laser in the Earth's magnetosphere http://link.aip.org/link/?PHP/19/010701/1&agg=rss A. R. Soto-Chavez, A. Bhattacharjee, and C. S. Ng<br/> A new theoretical model for whistler-mode chorus amplification in the Earth's magnetosphere is presented. We derive, based on the free-electron laser mechanism in a high-gain amplifier, a new closed set of self-consistent relativistic equations that couple the Hamiltonian equations for particles wit ... [Phys. Plasmas 19, 010701 (2012)] published Fri Jan 6, 2012. Observation of the Taylor instability in a dusty plasma http://link.aip.org/link/?PHP/19/014501/1&agg=rss K. A. Pacha, J. R. Heinrich, S.-H. Kim, and R. L. Merlino<br/> Observations of the Taylor instability in a laboratory dusty plasma are presented. The dust cloud, formed in a dc argon glow-discharge plasma, is stratified into regions of high and low dust densities. The instability was triggered by a spontaneous intrusion of the low density dust fluid into the hi ... [Phys. Plasmas 19, 014501 (2012)] published Thu Jan 5, 2012. Bounce-free spherical hydrodynamic implosion http://link.aip.org/link/?PHP/18/120702/1&agg=rss Grigory Kagan, Xian-Zhu Tang, Scott C. Hsu, and Thomas J. Awe<br/> In a bounce-free spherical hydrodynamic implosion, the post-stagnation hot core plasma does not expand against the imploding flow. Such an implosion scheme has the advantage of improving the dwell time of the burning fuel, resulting in a higher fusion burn-up fraction. The existence of bounce-free s ... [Phys. Plasmas 18, 120702 (2011)] published Tue Dec 27, 2011. Nonlinear lower hybrid oscillations in a cold viscous plasma http://link.aip.org/link/?PHP/18/124502/1&agg=rss Chandan Maity and Nikhil Chakrabarti<br/> An analytical description of nonlinear lower hybrid oscillations in a cold quasi-neutral plasma in the presence of viscosity is presented in one spatial dimension by using Lagrangian variables. By treating viscosity coefficients of the electron and ion fluids as inversely proportional to their respe ... [Phys. Plasmas 18, 124502 (2011)] published Tue Dec 27, 2011. Measurements and simulations of shock wave generated plasma-vacuum interface http://link.aip.org/link/?PHP/18/120701/1&agg=rss D. Kaganovich, M. H. Helle, D. F. Gordon, and A. Ting<br/> A controlled gradient gas jet was designed, constructed, and tested at the Naval Research Laboratory for the generation of high density and sharp gradient plasma regions. The gas jet uses a laser-generated shock wave to control the density gradient at the vacuum and neutral gas interface. The length ... [Phys. Plasmas 18, 120701 (2011)] published Wed Dec 21, 2011. Enhanced thermal self-focusing of a Gaussian laser beam in a collisionless plasma http://link.aip.org/link/?PHP/18/124501/1&agg=rss Devki Nandan Gupta and Hyyong Suk<br/> Theory given by Wang-Zhou [Phys. Plasmas 18, 043101 (2011)] for the thermal self-focusing of a Gaussian laser beam in a collisionless plasma is revisited by including the effect of a localized upward plasma-density ramp. As the equilibrium electron density is an increasing function of the distance o ... [Phys. Plasmas 18, 124501 (2011)] published Wed Dec 7, 2011. Plasmon effects on the entanglement fidelity for elastic collisions in hot quantum plasmas http://link.aip.org/link/?PHP/18/114503/1&agg=rss Young-Dae Jung<br/> The plasmon and screening effects on the entanglement fidelity for the elastic electron-ion collision are investigated in hot quantum plasmas. The partial wave analysis and effective interaction including the plasmon couplings are employed to obtain the entanglement fidelity function in hot quantum ... [Phys. Plasmas 18, 114503 (2011)] published Tue Nov 29, 2011. Convective motion in collisionless trapped electron mode turbulence http://link.aip.org/link/?PHP/18/110703/1&agg=rss Y. Xiao and Z. Lin<br/> Global gyrokinetic particle simulation of collisionless trapped electron mode turbulence in toroidal plasmas finds both diffusive and convective electron motion using a Lagrangian analysis. The convective motion is identified using simulation and analytic theory to arise from the conservation of the ... [Phys. Plasmas 18, 110703 (2011)] published Mon Nov 28, 2011.