Reduction of Turbulent Transport with Zonal Flows Enhanced in Helical Systems
T.-H. Watanabe, H. Sugama, and S. Ferrando-Margalet
Gyrokinetic Vlasov simulations of the ion temperature gradient turbulence are performed in order to investigate effects of helical magnetic configurations on turbulent transport and zonal flows. The obtained results confirm the theoretical prediction that helical configurations optimized for reducin ... [Phys. Rev. Lett. 100, 195002 (2008)] published Fri May 16, 2008.
Effects of flow shear and Alfv[e-acute]n waves on two-dimensional magnetohydrodynamic turbulence
Jamie Douglas, Eun-jin Kim, and A. Thyagaraja
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
V. A. Svidzinski and H. Li
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.
Comment on ``Plasma Modulation of Harmonic Emission Spectra from Laser-Plasma Interactions''
M. Zepf, K. Krushelnick, and A. E. Dangor
A Comment on the Letter by T. J. M. Boyd and R. Ondarza-Rovira [Phys. Rev. Lett. 98, 105001 (2007)]. The authors of the Letter offer a Reply. ... [Phys. Rev. Lett. 100, 199501 (2008)] published Thu May 15, 2008.
Boyd and Ondarza-Rovira Reply:
T. J. M. Boyd and R. Ondarza-Rovira
A Reply to the Comment by M. Zepf, K. Krushelnick, and A. E. Dangor. ... [Phys. Rev. Lett. 100, 199502 (2008)] published Thu May 15, 2008.
Transformation of a tungsten wire to the plasma state by nanosecond electrical explosion in vacuum
G. S. Sarkisov, S. E. Rosenthal, and K. W. Struve
Experiment demonstrates the first direct transformation of a tungsten wire core to the plasma state by Joule heating during nanosecond electrical explosion in vacuum. Energy of ~130 eV/atom was deposited into the 12 [mu]m W wire coated by 2 [mu]m polyimide during the first ~10 ns. All the metal ... [Phys. Rev. E 77, 056406 (2008)] published Wed May 14, 2008.
Characterization of an atmospheric double arc argon-nitrogen plasma source
X. Tu, B. G. Cheron, J. H. Yan, L. Yu, and K. F. Cen
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.
Unfolding core asymmetries with x-ray emission images in symmetry diagnostic experiments
T. X. Huang, Y. K. Ding, Z. J. Zheng, W. Y. Miao, Z. R. Cao et al.
A novel inversion technique is proposed to unfold core asymmetries at the source with x-ray emission images, which were obtained from imploded surrogate capsules in symmetry diagnostic experiments. The axisymmetrical core emission can be expanded as a Fourier series, with Legendre polynomials and sp ... [Rev. Sci. Instrum. 79, 053503 (2008)] published Wed May 14, 2008.
Direct Acceleration of Electrons in a Corrugated Plasma Waveguide
A. G. York, H. M. Milchberg, J. P. Palastro, and T. M. Antonsen
Historically, direct acceleration of charged particles by electromagnetic fields has been limited by diffraction, phase matching, and material damage thresholds. A recently developed plasma micro-optic [B. Layer et al., Phys. Rev. Lett. 99, 035001 (2007)] removes these limitations and promises to al ... [Phys. Rev. Lett. 100, 195001 (2008)] published Wed May 14, 2008.
Ion beam acceleration in a divergent magnetic field
Ioana A. Biloiu, Earl E. Scime, and Costel Biloiu
Two-dimensional argon ion velocity distribution functions (IVDFs) in the expansion region of a helicon plasma source have been measured by laser-induced-fluorescence tomography. Below a threshold value of the magnetic field in the expansion region, the IVDFs show a bimodal structure comprised of a s ... [Appl. Phys. Lett. 92, 191502 (2008)] published Tue May 13, 2008.
Spectroscopic measurement of electric field in dielectric barrier discharge in helium
B. M. Obradovic, S. S. Ivkovic, and M. M. Kuraica
Spatial distribution of electric field strength in dielectric barrier discharge in helium is determined from the Stark splitting and shifting of two visible helium lines and their forbidden components. Electric field is calculated by using spectral distance between forbidden and allowed components a ... [Appl. Phys. Lett. 92, 191501 (2008)] published Tue May 13, 2008.
Effect of electron nonthermality on nonlinear electrostatic solitary waves in a charge varying dusty plasma
Mouloud Tribeche and Ghania Boumezoued
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
Naveen Kumar and Alexander Pukhov
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
Petr Hellinger
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
A. P. Misra and P. K. Shukla
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.
Structure of strongly coupled multicomponent plasmas
K. Wunsch, P. Hilse, M. Schlanges, and D. O. Gericke
We investigate the short-range structure in strongly coupled fluidlike plasmas using the hypernetted chain approach generalized to multicomponent systems. Good agreement with numerical simulations validates this method for the parameters considered. We found a strong mutual impact on the spatial arr ... [Phys. Rev. E 77, 056404 (2008)] published Mon May 12, 2008.
Classical nucleation theory of the one-component plasma
Randall L. Cooper and Lars Bildsten
We investigate the crystallization rate of a one-component plasma (OCP) in the context of classical nucleation theory. From our derivation of the free energy of an arbitrary distribution of solid clusters embedded in a liquid phase, we derive the steady-state nucleation rate of an OCP as a function ... [Phys. Rev. E 77, 056405 (2008)] published Mon May 12, 2008.
Simulation and analysis of ultrafast-laser-pulse-induced plasma generation in fused silica
Jeremy R. Gulley, Sebastian W. Winkler, and W. M. Dennis
Recent experiments on optical damage by ultrashort laser pulses have demonstrated that the temporal pulse shape can dramatically influence plasma generation in fused silica. We use a modified 3+1D nonlinear Schrodinger equation for the pulse propagation coupled to a rate equation for the plasma dens ... [Opt. Eng. 47, 054302 (2008)] published Mon May 12, 2008.
An Approach to the Lightning Overvoltage Protection of Medium Voltage Lines in Severe Lightning Areas
M. A. Omidiora and M. Lehtonen
This paper deals with the effect of shield wires on lightning overvoltage reduction and the energy relief of MOV (Metal Oxide Varistor) arresters from direct strokes to distribution lines. The subject of discussion is the enhancement of lightning protection in Finnish distribution networks where lig ... [AIP Conf. Proc. 1007, 140 (2008)] published Mon May 12, 2008.
Control of whistler radiation efficiency of a loop antenna by generation of ambient magnetic field irregularities
M. E. Gushchin, S. V. Korobkov, A. V. Kostrov, A. V. Strikovsky, T. M. Zaboronkova et al.
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
V. V. Nemov, S. V. Kasilov, W. Kernbichler, and G. O. Leitold
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
E. Tassi, F. Militello, F. Porcelli, and R. J. Hastie
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.
Deposited debris characteristics and its reduction of a laser-produced plasma extreme ultraviolet source using a colloidal tin dioxide jet target
Masanori Kaku, Sumihiro Suetake, Yusuke Senba, Shoichi Kubodera, Masahito Katto et al.
Debris characteristics and their reduction have been investigated for a laser-produced plasma extreme ultraviolet source by using a colloidal jet target containing tin dioxide nanoparticles. The amounts of deposited debris on a witness plate were determined by total laser energy irradiated onto a ta ... [Appl. Phys. Lett. 92, 181503 (2008)] published Fri May 9, 2008.
Modified Jeans Instability Criteria for Magnetized Systems. (arXiv:0805.2287v1 [physics.plasm-ph])
ePrint arXiv http://arXiv.org/
Surface states and the charge of a dust particle in a plasma. (arXiv:0801.0950v2 [physics.plasm-ph] UPDATED)
ePrint arXiv http://arXiv.org/