Physical Review E (Plasma physics)

Author(s): Felipe A. Asenjo and Swadesh M. Mahajan

Using a generally covariant electrovortic (magnetofluid) formalism for relativistic plasmas, the dynamical evolution of a generalized vorticity (a combination of the magnetic and kinematic parts) is studied in a cosmological context. We derive macroscopic vorticity and magnetic field structures that...

[Phys. Rev. E 99, 053204] Published Mon May 13, 2019

Author(s): T.-N. Beuermann, R. Redmer, and Th. Bornath

X-ray Thomson scattering experiments in the soft and hard x-ray regime yield information on fundamental parameters of high-density systems. Pump-probe experiments with variable time delay provide insight into the excitation and relaxation dynamics in dense plasmas. On short time scales, a local ther...

[Phys. Rev. E 99, 053205] Published Mon May 13, 2019

Author(s): Zh. A. Moldabekov, H. Kählert, T. Dornheim, S. Groth, M. Bonitz, and T. S. Ramazanov

The dynamical structure factor (DSF) of strongly coupled ions in dense plasmas with partially and strongly degenerate electrons is investigated. The main focus is on the impact of electronic correlations (nonideality) on the ionic DSF. The latter is computed by carrying out molecular dynamics (MD) s...

[Phys. Rev. E 99, 053203] Published Fri May 10, 2019

Author(s): Denis Kuzzay, Olga Alexandrova, and Lorenzo Matteini

We present a local approach to the study of scale-to-scale energy transfers in magnetohydrodynamic (MHD) turbulence. This approach is based on performing local averages of the physical fields, which amounts to filtering scales smaller than some parameter ℓ. A key step in this work is the derivation ...

[Phys. Rev. E 99, 053202] Published Thu May 09, 2019

Author(s): Gérald Faussurier and Christophe Blancard

Expressions of pressure in warm and hot dense matter using the average-atom model are presented. They are based on the stress-tensor approach. Nonrelativistic and relativistic cases are considered. The obtained formulas are simple and can be easily implemented in an average-atom model code. Comparis...

[Phys. Rev. E 99, 053201] Published Fri May 03, 2019

Author(s): Xiang Fan, P. H. Diamond, and L. Chacón

This Rapid Communication identifies the physical mechanism for the quench of turbulent resistivity in two-dimensional magnetohydrodynamics. Without an imposed, ordered magnetic field, a multiscale, blob-and-barrier structure of magnetic potential forms spontaneously. Magnetic energy is concentrated ...

[Phys. Rev. E 99, 041201(R)] Published Mon Apr 29, 2019

Author(s): Shikha Bhadoria and Naveen Kumar

Collisionless shock acceleration of carbon ions (C6+) is investigated in the ultrarelativistic regime of laser-plasma interaction by accounting for the radiation reaction force and the pair production in particle-in-cell simulations. Both radiation reaction force and pair-plasma formation tend to sl...

[Phys. Rev. E 99, 043205] Published Mon Apr 29, 2019

Author(s): Erico L. Rempel, Tiago F. P. Gomes, Suzana S. A. Silva, and Abraham C.-L. Chian

Magnetic coherent vortical structures are ubiquitous in space and astrophysical plasmas and their detection is key to understanding the nature of the intrinsic turbulence in those conducting fluids. A recently developed method to detect magnetic vortices is explored in problems of two- and three-dim...

[Phys. Rev. E 99, 043206] Published Mon Apr 29, 2019

Author(s): B. B. L. Witte, G. Röpke, P. Neumayer, M. French, P. Sperling, V. Recoules, S. H. Glenzer, and R. Redmer

Dharma-wardana et al. [M. W. C. Dharma-wardana et al., Phys. Rev. E 96, 053206 (2017)] recently calculated dynamic electrical conductivities for warm dense matter as well as for nonequilibrium two-temperature states termed “ultrafast matter” (UFM) [M. W. C. Dharma-wardana, Phys. Rev. E 93, 063205 (...

[Phys. Rev. E 99, 047201] Published Wed Apr 24, 2019

Author(s): Giulia Cozzani, A. Retinò, F. Califano, A. Alexandrova, O. Le Contel, Y. Khotyaintsev, A. Vaivads, H. S. Fu, F. Catapano, H. Breuillard, N. Ahmadi, P.-A. Lindqvist, R. E. Ergun, R. B. Torbert, B. L. Giles, C. T. Russell, R. Nakamura, S. Fuselier, B. H. Mauk, T. Moore, and J. L. Burch

The electron diffusion region (EDR) is the region where magnetic reconnection is initiated and electrons are energized. Because of experimental difficulties, the structure of the EDR is still poorly understood. A key question is whether the EDR has a homogeneous or patchy structure. Here we report M...

[Phys. Rev. E 99, 043204] Published Tue Apr 09, 2019

Author(s): M. L. Shmatov

It is shown that photons of the prolonged emission recorded by the Gamma-Ray Observation of Winter Thunderclouds (GROWTH) experiment on January 13, 2012 [D. Umemoto et al., Phys. Rev E 93, 021201(R) (2016)] could be emitted by ball lightning and generated by annihilation of positrons which arose mai...

[Phys. Rev. E 99, 043203] Published Mon Apr 08, 2019

Author(s): Y. Zaporozhets, V. Mintsev, V. Fortov, H. Reinholz, G. Röpke, S. Rosmej, and Y. A. Omarbakiyeva

New data for the reflectivity of shock-compressed xenon plasmas at pressures of 10–12 GPa at large incident angles are presented. In addition, measurements have been performed at different densities. These data allow to analyze the free-electron density profile across the shock wave front. Assuming ...

[Phys. Rev. E 99, 043202] Published Wed Apr 03, 2019

Author(s): V. F. Kovalev and V. Yu. Bychenkov

Using the renormalization-group approach, we consider an analytic theory describing the formation of a self-focusing structure of a laser beam in a plasma with relativistic nonlinearity for a given radial intensity distribution at the entrance and derive approximate analytic solutions. We study thre...

[Phys. Rev. E 99, 043201] Published Tue Apr 02, 2019

Author(s): Felix Mackenroth, Naveen Kumar, Norman Neitz, and Christoph H. Keitel

Laser pulses traveling through a plasma can feature group velocities significantly differing from the speed of light in vacuum. This modifies the well-known Volkov states of an electron inside a strong laser-field from the vacuum case and, consequently, all quantum electrodynamical effects triggered...

[Phys. Rev. E 99, 033205] Published Tue Mar 26, 2019

Author(s): Alexander Andrievsky, Roman Chertovskih, and Vladislav Zheligovsky

Pointwise zero velocity helicity density is shown not to prevent steady flows from acting as kinematic dynamos. We present numerical evidences that such flows can generate both small-scale magnetic fields as well as, by the magnetic α-effect or negative eddy diffusivity mechanisms, large-scale ones....

[Phys. Rev. E 99, 033204] Published Thu Mar 14, 2019

Author(s): E. S. Efimenko, A. V. Bashinov, A. A. Gonoskov, S. I. Bastrakov, A. A. Muraviev, I. B. Meyerov, A. V. Kim, and A. M. Sergeev

The cascaded production and dynamics of electron-positron plasma in ultimately focused laser fields of extreme intensity are studied by three-dimensional particle-in-cell simulations with the account of the relevant processes of quantum electrodynamics (QED). We show that, if the laser facility prov...

[Phys. Rev. E 99, 031201(R)] Published Wed Mar 13, 2019

Author(s): P. Michel, M. J. Rosenberg, W. Seka, A. A. Solodov, R. W. Short, T. Chapman, C. Goyon, N. Lemos, M. Hohenberger, J. D. Moody, S. P. Regan, and J. F. Myatt

Raman side scatter, whereby scattered light is resonant while propagating perpendicularly to a density gradient in a plasma, was identified experimentally in planar-target experiments at the National Ignition Facility at intensities orders of magnitudes below the threshold for absolute instability. ...

[Phys. Rev. E 99, 033203] Published Wed Mar 13, 2019

Author(s): Marco Antonio Ridenti, Jayr de Amorim, and Arnaldo Dal Pino

We present a model that describes the departure from equilibrium of the OH(A) rotational level distribution in collisional plasmas. In this model, the OH(A) rotational state densities are governed by a rate equation including: (i) a balanced rotational energy transfer process with the buffer gas spe...

[Phys. Rev. E 99, 033202] Published Thu Mar 07, 2019

Author(s): Gerd Röpke, David Blaschke, Tilo Döppner, Chengliang Lin, Wolf-Dietrich Kraeft, Ronald Redmer, and Heidi Reinholz

New facilities explore warm dense matter (WDM) at conditions with extreme densities (exceeding ten times condensed matter densities) so that electrons are degenerate even at temperatures of 10–100 eV. Whereas in the nondegenerate region correlation effects such as Debye screening are relevant for th...

[Phys. Rev. E 99, 033201] Published Mon Mar 04, 2019

Author(s): A. R. Christopherson, R. Betti, and J. D. Lindl

Separating ignition of the central hot spot from propagating burn in the surrounding dense fuel is crucial to conclusively assess the achievement of ignition in inertial confinement fusion (ICF). We show that the transition from hot spot ignition to the onset of propagating burn occurs when the alph...

[Phys. Rev. E 99, 021201(R)] Published Mon Feb 25, 2019