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  • Impact of a minority relativistic electron tail interacting with a thermal plasma containing high-atomic-number impurities
    Phys. Plasmas (IF 1.913) Pub Date : 2020-04-24
    Nathan A. Garland, Hyun-Kyung Chung, Christopher J. Fontes, Mark C. Zammit, James Colgan, Todd Elder, Christopher J. McDevitt, Timothy M. Wildey, Xian-Zhu Tang

    A minority relativistic electron component can arise in both laboratory and naturally occurring plasmas. In the presence of high-atomic-number ion species, the ion charge state distribution at a low bulk electron temperature can be dominated by relativistic electrons, even though their density is orders of magnitude lower. This is due to the relativistic enhancement of the collisional excitation and

    更新日期:2020-04-24
  • Design study of a combined interferometer and polarimeter for a high-field, compact tokamak
    Phys. Plasmas (IF 1.913) Pub Date : 2020-04-23
    Alexander J. Creely, Lucio M. Milanese, Elizabeth A. Tolman, James H. Irby, Sean B. Ballinger, Samuel Frank, Adam Q. Kuang, Bryan L. Linehan, William McCarthy, Kevin J. Montes, Theodore Mouratidis, Julian F. Picard, Pablo Rodriguez-Fernandez, Aaron M. Rosenthal, Alexander J. Sandberg, Francesco Sciortino, Raspberry A. Simpson, R. Alexander Tinguely, Muni Zhou, Anne E. White

    This article is the first design study of a combined interferometer and polarimeter on a compact, high-field, high-density, net-energy tokamak. Recent advances in superconducting technology have made possible designs for compact, high magnetic field fusion power plants, such as ARC [Sorbom et al., Fusion Eng. Des. 100, 378 (2015)], and experiments, such as SPARC [Greenwald et al., PSFC Report No. RR-18-2

    更新日期:2020-04-23
  • Nonlinearδfparticle in cell gyrokinetic simulations of the microtearing mode
    Phys. Plasmas (IF 1.913) Pub Date : 2020-04-21
    J. Chowdhury, Yang Chen, Scott E. Parker

    Nonlinear simulations are carried out for the microtearing mode using particle-based δ f gyrokinetic simulations for parameters relevant to spherical tokamaks. The present study finds that the microtearing mode can generate significant electron heat flux, which is predominantly carried out by the electromagnetic component of the heat flux with a negligible contribution from the electrostatic component

    更新日期:2020-04-21
  • Study of argon expulsion from the post-disruption runaway electron plateau following low-Z massive gas injection in DIII-D
    Phys. Plasmas (IF 1.913) Pub Date : 2020-04-20
    E. M. Hollmann, I. Bykov, N. W. Eidietis, J. L. Herfindal, A. Lvovskiy, R. A. Moyer, P. B. Parks, C. Paz-Soldan, A. Yu. Pigarov, D. L. Rudakov, D. Shiraki, J. Watkins

    A 1D radial diffusion model is developed to study the observed rapid expulsion of argon from the runaway electron plateau in the DIII-D tokamak following secondary massive low-Z ( D 2 or He) gas injection. The expulsion of argon is found to be caused by further cooling of the background plasma due to the added neutrals, accompanied by recombination of argon ions and the greatly increased outward radial

    更新日期:2020-04-20
  • Plasma current regulated by balance between driving and restricting forces
    Phys. Plasmas (IF 1.913) Pub Date : 2020-04-17
    Kiyoyuki Yambe, Takuya Inamura

    In many plasma applications, the plasma current, which is determined by the plasma density and drift velocity, is an important parameter when investigating the induced phenomenon and its effects. However, it is unclear which physical parameters are responsible for regulating the current. Plasma is generated by a balance between the driving and restricting forces. The driving force originates from the

    更新日期:2020-04-17
  • Linear dispersion theory of parallel electromagnetic modes for regularized Kappa-distributions
    Phys. Plasmas (IF 1.913) Pub Date : 2020-04-17
    Edin Husidic, Marian Lazar, Horst Fichtner, Klaus Scherer, Patrick Astfalk

    The velocity particle distributions measured in situ in space plasmas deviate from Maxwellian (thermal) equilibrium, showing enhanced suprathermal tails that are well described by the standard Kappa-distribution (SKD). Despite its successful application, the SKD is frequently disputed due to a series of unphysical implications such as diverging velocity moments, preventing a macroscopic description

    更新日期:2020-04-17
  • Plasma and trap-based techniques for science with antimatter
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-19
    J. Fajans, C. M. Surko

    Positrons (i.e., antielectrons) find use in a wide variety of applications, and antiprotons are required for the formation and study of antihydrogen. Available sources of these antiparticles are relatively weak. To optimize their use, most applications require that the antiparticles be accumulated into carefully prepared plasmas. We present an overview of the techniques that have been developed to

    更新日期:2020-04-16
  • Laser-shocked calcium difluoride (CaF2) as a warm dense matter
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-02
    Hua Shu, Youjun Zhang, Bihan Wang, Wenge Yang, Hongliang Dong, Tsubasa Tobase, Junjian Ye, Xiuguang Huang, Sizu Fu, Qiang Zhou, Toshimori Sekine

    We determined the shock equation of state of CaF2 at pressures of ∼0.4–1.5 TPa using high-power laser shock techniques. The shock velocity-particle velocity was approximated by the universal Hugoniot relationship known to metallic fluids. Our results do not support the incompressible behavior above ∼100 GPa claimed previously. Warm dense CaF2 is a bonded liquid above the melting point and approaches

    更新日期:2020-04-16
  • Mechanisms of energetic-particle transport in magnetically confined plasmas
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-02
    W. W. Heidbrink, R. B. White

    Super-thermal ions and electrons occur in both space and fusion plasmas. Because these energetic particles (EP) have large velocities, EP orbits necessarily deviate substantially from magnetic surfaces. Orbits are described by conserved constants of motion that define topological boundaries for different orbit types. Electric and magnetic field perturbations produced by instabilities can disrupt particle

    更新日期:2020-04-16
  • Effects of chemical potentials on isothermal ion-acoustic solitary waves and their three-dimensional instability in a magnetized ultra-relativistic degenerate multicomponent plasma
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-02
    E. F. El-Shamy, M. M. Selim, A. El-Depsy, M. O. Abdellahi, O. Al-Hagan, A. Al-Mogeeth, L. Alelyani

    The three-dimensional instability of isothermal ion-acoustic (IIA) solitary waves is examined in a magnetized ultra-relativistic degenerate multicomponent plasma, comprising nondegenerate inertial warm ions and ultra-relativistic degenerate inertialess electrons as well as positrons, by applying a small-k (long wavelength) expansion method. The nonlinear dynamics of IIA solitary waves in such a plasma

    更新日期:2020-04-16
  • Laser Raman scattering by graphene plasmons
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-02
    Pawan Kumar

    A new scheme of Raman scattering of a laser by THz graphene plasmons in the presence of both space charge and electromagnetic surface plasmons is proposed. Plasmon–laser coupling arises through the two dimensional response of electrons in graphene. For optical frequency laser scattering by THz plasmons, phase matching conditions are satisfied for near normal incidence and the Raman scattered wave also

    更新日期:2020-04-16
  • Rotation of electromagnetic energy initiated by azimuthal surface waves in coaxial metal waveguides entirely filled by plasma
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-02
    Igor O. Girka, Ivan V. Pavlenko, Manfred Thumm

    Azimuthal surface waves are well-known to be eigenwaves of coaxial metal waveguides entirely filled by plasma. The present study of electromagnetic energy transfer complements the investigation of the wave dispersion properties carried out earlier. The angular velocity of energy transfer is analyzed as a function of the coaxial-line parameters and compared with three limiting cases. One case is a metal

    更新日期:2020-04-16
  • Collisionless tangential discontinuity between pair plasma and electron–proton plasma
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-03
    M. E. Dieckmann

    We study with a one-dimensional particle-in-cell simulation the expansion of a pair cloud into a magnetized electron–proton plasma as well as the formation and subsequent propagation of a tangential discontinuity that separates both plasmas. Its propagation speed takes the value that balances the magnetic pressure of the discontinuity against the thermal pressure of the pair cloud and the ram pressure

    更新日期:2020-04-16
  • Electron cyclotron resonance (ECR) magnetometry with a plasma reservoir
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-03
    E. D. Hunter, A. Christensen, J. Fajans, T. Friesen, E. Kur, J. S. Wurtele

    The local magnetic field in a Penning–Malmberg trap is found by measuring the temperatures that result when electron plasmas are illuminated by microwave pulses. Multiple heating resonances are observed as the pulse frequencies are swept. The many resonances are due to electron bounce and plasma rotation sidebands. The heating peak corresponding to the cyclotron frequency resonance is identified to

    更新日期:2020-04-16
  • Driven electrostatic phase space vortices in a 1D weakly dissipative Vlasov–Poisson system
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-03
    Pallavi Trivedi, Rajaraman Ganesh

    The effect of collisions on driven electrostatic phase space vortices is analyzed by means of Eulerian simulation for two different collision models. It was demonstrated recently [P. Trivedi and R. Ganesh, Phys. Plasmas 23, 062112 (2016)] that in the absence of collisions, at late times, steady state phase space vortices manifest to form a plateau in the resonant region of the particle velocity distribution

    更新日期:2020-04-16
  • Characterizing magnetized plasmas with dynamic mode decomposition
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-03
    A. A. Kaptanoglu, K. D. Morgan, C. J. Hansen, S. L. Brunton

    Accurate and efficient plasma models are essential to understand and control experimental devices. Existing magnetohydrodynamic or kinetic models are nonlinear and computationally intensive and can be difficult to interpret, while often only approximating the true dynamics. In this work, data-driven techniques recently developed in the field of fluid dynamics are leveraged to develop interpretable

    更新日期:2020-04-16
  • Recoil effects on reflection from relativistic mirrors in laser plasmas
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-10
    P. Valenta, T. Zh. Esirkepov, J. K. Koga, A. S. Pirozhkov, M. Kando, T. Kawachi, Y.-K. Liu, P. Fang, P. Chen, J. Mu, G. Korn, O. Klimo, S. V. Bulanov

    Relativistic mirrors can be realized with strongly nonlinear Langmuir waves excited by intense laser pulses in underdense plasma. On reflection from the relativistic mirror, the incident light affects the mirror motion. The corresponding recoil effects are investigated analytically and using particle-in-cell simulations. It is found that if the fluence of the incident electromagnetic wave exceeds a

    更新日期:2020-04-16
  • On description of periodic magnetosonic perturbations in a quasi-isentropic plasma with mechanical and thermal losses and electrical resistivity
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-11
    Anna Perelomova

    Magnetosonic periodic perturbations in a uniform and infinite plasma model are considered. Damping due to compressional viscosity, electrical resistivity, and thermal conduction are taken into account, as well as some heating–cooling function, which may destroy the isentropicity of wave perturbations. The wave vector forms arbitrary angle θ with the equilibrium straight magnetic field, and all perturbations

    更新日期:2020-04-16
  • Generation of kinetic Alfvén wave and whistler waves by parametric decay of high power laser in laser–plasma interaction
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-13
    Himani Dewan, R. Uma, R. P. Sharma

    In this paper, we report theoretical modeling for parametric decay instability of the high-intensity elliptically polarized laser beam [pump wave, ( ω 0)]. A wave–wave interaction model is investigated, based on the decay of the high-intensity elliptically polarized laser ( ω 0) into an oblique whistler wave (OWW, ( ω 1 )) and a kinetic Alfvén wave (KAW, ( ω 2 )). The importance of oblique whistler

    更新日期:2020-04-16
  • Evaluating higher moments in the transverse Kelvin–Helmholtz instability by full kinetic simulation
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-17
    Takayuki Umeda

    Approximated forms of the third and fourth moments of a velocity distribution function are derived by using a perturbed velocity distribution function around a characteristic spatial scale on the gyroradius derived by Thompson [Rep. Prog. Phys. 24, 363–424 (1961)]. Then, they are evaluated by using a two-dimensional full kinetic Vlasov simulation result of the transverse Kelvin–Helmholtz instability

    更新日期:2020-04-16
  • Electron-exchange and correlation effects on filamentation instability of a high-density current-driven plasma
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-19
    M. R. Taghadosi, A. R. Niknam, S. M. Khorashadizadeh

    The effects of exchange and correlation on the filamentation instability of a high-density current-driven plasma are theoretically investigated under diffusion conditions by applying the quantum hydrodynamic (QHD) model and the Ampère-Maxwell law. Based on the dispersion relation, a new instability condition is presented, according to which, the important characteristic quantities are identified. Moreover

    更新日期:2020-04-16
  • Cross-field chaotic transport of electrons by E × B electron drift instability in Hall thruster
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-02
    D. Mandal, Y. Elskens, N. Lemoine, F. Doveil

    A model calculation is presented to characterize the anomalous cross field transport of electrons in a Hall thruster geometry. The anomalous nature of the transport is attributed to the chaotic dynamics of the electrons arising from their interaction with fluctuating unstable electrostatic fields of the electron cyclotron drift instability that is endemic in these devices. The electrons energy gain

    更新日期:2020-04-16
  • Nonlinear error field response in the presence of plasma rotation and real frequencies due to favorable curvature
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-04
    Cihan Akçay, John M. Finn, Andrew J. Cole, Dylan P. Brennan

    We present nonlinear NIMROD resistive MHD simulations of the response of a rotating plasma to an error field when the plasma has weakly damped linear tearing modes (TMs), stabilized by a pressure gradient and favorable curvature. The favorable curvature leads to the Glasser effect: the occurrence of real frequencies and stabilization with positive stability index Δ ′. A cylinder with hollow pressure

    更新日期:2020-04-16
  • A closer look at turbulence spreading: How bistability admits intermittent, propagating turbulence fronts
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-05
    R. A. Heinonen, P. H. Diamond

    In magnetic fusion plasmas, mounting evidence suggests the possibility of sustained turbulence below the linear stability threshold or more generally global turbulence bistability. The usual reduced models for turbulence spreading are unistable/supercritical and incompatible with this result. The older models also cannot realistically support fronts connecting laminar and turbulent domains. In this

    更新日期:2020-04-16
  • Flux-balanced two-field plasma edge turbulence in a channel geometry
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-06
    Di Qi, Andrew J. Majda

    We investigate the drift wave–zonal flow interaction formulated on a channel domain geometry approximating an isolated plasma edge region with zero net radial transport across the boundary. The recent two-field flux-balanced Hasegawa–Wakatani (BHW) model with improved treatment for a parallel electron response is adapted to the channel geometry configuration, which allows for generalized non-uniform

    更新日期:2020-04-16
  • Collisional multispecies drift fluid model
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-10
    A. Poulsen, J. Juul Rasmussen, M. Wiesenberger, V. Naulin

    Transport in the edge and scrape-off layer mediated by turbulent fluctuations is often studied using drift fluid models. In this work, we expand previous work on a two-fluid single ion species drift model to a multi-ion-species model that incorporates collisional interactions between the individual species while conserving energy. The model is simplified into a set of equations that are computationally

    更新日期:2020-04-16
  • New insights on fast ion-acoustic soliton stopbands and extension to dusty plasmas
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-19
    S. K. Maharaj, R. Bharuthram

    Large amplitude fast ion-acoustic solitons are revisited in a three-component plasma composed of cold ions, warm (adiabatic) ions, and hot Boltzmann electrons to determine where the limits occur in the ranges of the warm ion-to-electron temperature ratio τ and the charge-to-mass ratio of the cold ions relative to the warm ions μ for the existence of stopbands. The warm (adiabatic) ion limiting curve

    更新日期:2020-04-16
  • Understanding the reduction of the edge safety factor during hot VDEs and fast edge cooling events
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-04
    F. J. Artola, K. Lackner, G. T. A. Huijsmans, M. Hoelzl, E. Nardon, A. Loarte

    In the present work, a simple analytical approach is presented in order to clarify the physics behind the edge current density behavior of a hot plasma entering in contact with a resistive conductor. As has been observed in recent simulations [C. R. Sovinec and K. J. Bunkers, Plasma Phys. Controlled Fusion 61(2), 024003 (2019)], when a plasma comes in contact with a highly resistive wall, large current

    更新日期:2020-04-16
  • Runaway electron transport in stochastic toroidal magnetic fields
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-05
    L. Carbajal, D. del-Castillo-Negrete, J. J. Martinell

    In this work, we study the transport and confinement properties of runaway electrons (RE) in the presence of magnetic fields with perturbations producing different levels of stochasticity. We use Kinetic Orbit Runaway Electron Code (KORC) [Carbajal et al., Phys. Plasmas 24, 042512 (2017) and del-Castillo-Negrete et al., Phys. Plasmas 25, 056104 (2018)] for simulating the full-orbit (FO) and guiding-center

    更新日期:2020-04-16
  • Time-dependent modeling of coupled plasma-wall dynamics
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-05
    R. D. Smirnov, S. I. Krasheninnikov, M. V. Umansky

    Effects of dynamic wall outgassing on divertor plasma during an edge localized mode (ELM)-like heat pulse are modeled using the newly coupled edge plasma code UEDGE and wall reaction-diffusion code FACE. Different divertor regimes are simulated depending on the degree of the plasma detachment. It is shown that hydrogen outgassing from the divertor target plate induced by ELM pulse in the semi-detached

    更新日期:2020-04-16
  • On the multiplicity of axisymmetric Alfvén continuous spectra in tokamaks
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-06
    Deng Zhou

    Axisymmetric Alfvén continuous spectra are derived using the ideal MHD equations. The usual toroidal coupling effect due to the variation of the magnetic field strength is neglected, but the curvature coupling of the pressure fluctuation and the geodesic compressional effect are included. The cylindrical continuous spectrum of Alfvén waves splits into two branches due to these effects. The frequency

    更新日期:2020-04-16
  • Verification of an improved equation-free projective integration method for neoclassical plasma-profile evolution in tokamak geometry
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-12
    Benjamin J. Sturdevant, Scott E. Parker, C. S. Chang, Robert Hager

    A brute-force, long-time gyrokinetic simulation of plasma profile evolution in magnetic fusion devices is not desirable due to large computational resource requirements and a possible accumulation of numerical error. The equation-free projective integration method of Keverekidis et al. [Commun. Math. Sci. 1(4), 715–762 (2003)] is one of the outstanding candidates in projecting micro-scale simulations

    更新日期:2020-04-16
  • Separating divertor closure effects on divertor detachment and pedestal shape in DIII-D
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-12
    A. L. Moser, L. Casali, B. M. Covele, A. W. Leonard, A. G. McLean, M. W. Shafer, H. Q. Wang, J. G. Watkins

    Comparison between an open divertor and a more-closed divertor in DIII-D demonstrates detachment up to 40% lower pedestal density ( n e , ped) in the closed divertor due to a combination of decreased fueling of the pedestal and increased dissipation in the scrape off layer (SOL) in the closed divertor, both resulting from increased neutral trapping in the divertor. Predicting whether the relationship

    更新日期:2020-04-16
  • Complex eikonal methods applied to geodesic acoustic mode dynamics
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-20
    F. Palermo, E. Poli, A. Bottino

    Techniques developed in the domain of optical theory are applied to investigate the behavior of Geodesic Acoustic Modes (GAMs). In this context, we show that this approach represents a powerful basis for the description of many characteristics of radial propagation and spreading of GAMs. The most attractive feature of these techniques is represented by their universality and intuitive applicability

    更新日期:2020-04-16
  • Gyrokinetic particle simulations of interactions between energetic particles and magnetic islands induced by neoclassical tearing modes
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-24
    X. Tang, Z. Lin, W. W. Heidbrink, J. Bao, C. Xiao, Z. Li, J. Li, L. Bardóczi

    Interactions between energetic particles (EPs) and neoclassical tearing mode (NTM) islands in the DIII-D tokamak are studied using the global gyrokinetic toroidal code (GTC). GTC simulations find that the EP radial profile is partially flattened within the magnetic island regions and that there are stochastic regions in the particle phase space. Radial particle flux is induced mainly around the magnetic

    更新日期:2020-04-16
  • A new explanation of the sawtooth phenomena in tokamaks
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-24
    S. C. Jardin, I. Krebs, N. Ferraro

    The ubiquitous sawtooth phenomena in tokamaks are so named because the central temperature rises slowly and falls rapidly, similar to the blades of a saw. First discovered in 1974, it has so far eluded a theoretical explanation that is widely accepted and consistent with experimental observations. We propose here a new theory for the sawtooth phenomena in auxiliary heated tokamaks, which is motivated

    更新日期:2020-04-16
  • Three-dimensional signatures of self-similarity in a high-energy-density plasma shear-driven mixing layer
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-02
    F. W. Doss, K. A. Flippo, E. C. Merritt, B. G. DeVolder, C. A. Di Stefano, C. M. Huntington, J. L. Kline, L. Kot, S. R. Nagel, A. M. Rasmus, D. W. Schmidt

    A hydrodynamic shear mixing layer experiment at the National Ignition Facility had previously demonstrated Eulerian scaling of integrated, late-time quantities, including turbulent kinetic energy. In this manuscript, the experiment is repeated with new materials. Using the new dataset, we demonstrate that Euler-number scalings hold not just for late time, but dynamically throughout the experiment,

    更新日期:2020-04-16
  • The experimental investigation of thehohlraumenergetics of two-entrance holes sphericalhohlraumat the 100 kJ level laser facility
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-03
    Ji Yan, Yaohua Chen, Zhongjing Chen, Shao'en Jiang, Guoli Ren, Xing Zhang, Wei Jiang, Liang Hao, Xingsen Che, Tao Xu, Li Chen, Chuankui Sun, Yunsong Dong, Bo Yu, Yudong Pu, Lifeng Wang, Xiantu He

    The two-laser entrance hole (LEHs) spherical hohlraum energetic experiments with all 48 laser beams and two laser pulse shapes at the 100 kJ level laser facility were investigated. In this work, the time-resolved radiation temperature measured by multi-angle x-ray diodes agreed well with LARED simulations, and the peak radiation temperature was up to 260 eV with the laser power of 45 TW. Meanwhile

    更新日期:2020-04-16
  • Mixing in ICF implosions on the National Ignition Facility caused by the fill-tube
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-04
    C. R. Weber, D. S. Clark, A. Pak, N. Alfonso, B. Bachmann, L. F. Berzak Hopkins, T. Bunn, J. Crippen, L. Divol, T. Dittrich, A. L. Kritcher, O. L. Landen, S. Le Pape, A. G. MacPhee, E. Marley, L. P. Masse, J. L. Milovich, A. Nikroo, P. K. Patel, L. A. Pickworth, N. Rice, V. A. Smalyuk, M. Stadermann

    The micrometer-scale tube that fills capsules with thermonuclear fuel in inertial confinement fusion experiments at the National Ignition Facility is also one of the implosion's main degradation sources. It seeds a perturbation that injects the ablator material into the center, radiating away some of the hot-spot energy. This paper discusses how the perturbation arises in experiments using high-density

    更新日期:2020-04-16
  • Impact of stalk on directly driven inertial confinement fusion implosions
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-10
    M. Gatu Johnson, P. J. Adrian, K. S. Anderson, B. D. Appelbe, J. P. Chittenden, A. J. Crilly, D. Edgell, C. J. Forrest, J. A. Frenje, V. Yu. Glebov, B. M. Haines, I. Igumenshchev, D. Jacobs-Perkins, R. Janezic, N. V. Kabadi, J. P. Knauer, B. Lahmann, O. M. Mannion, F. J. Marshall, T. Michel, F. H. Séguin, R. Shah, C. Stoeckl, C. A. Walsh, R. D. Petrasso

    Low-mode asymmetries have emerged as one of the primary challenges to achieving high-performing inertial confinement fusion (ICF) implosions. In direct-drive ICF, an important potential seed of such asymmetries is the capsule stalk mount, the impact of which has remained a contentious question. In this paper, we describe the results from an experiment on the OMEGA laser with intentional offsets at

    更新日期:2020-04-16
  • Enhancing electromagnetic radiations by a pre-ablation laser during laser interaction with solid target
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-11
    Yadong Xia, Dongyu Li, Siyuan Zhang, Minjian Wu, Tong Yang, Yixing Geng, Jungao Zhu, Xiaohan Xu, Chengcai Li, Chuanke Wang, Feng Wang, Chen Lin, Tingshuai Li, Xueqing Yan

    Ultra-short untraintense laser interacting with solid targets can produce significant electromagnetic pulses (EMPs), which are strongly pertinent to laser and target parameters. In this study, EMPs' generation due to pulsed laser (30 fs, 6 × 10 19 W/cm2) irradiating aluminum foils are recorded and analyzed. The experimental results indicate a pre-ablation pulse (200 ps, 1 × 10 12 W/cm2) that tends

    更新日期:2020-04-16
  • Modeling the 3-D structure of ignition experiments at the NIF
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-23
    R. Nora, J. E. Field, B. K. Spears, D. T. Casey, M. K. G. Kruse, D. A. Mariscal, P. Patel

    This work details a model used to infer the 3-D structure of the stagnated hot-spot and shell of inertial confinement fusion implosion experiments at the National Ignition Facility. The model assumes that 3-D low-mode drive perturbations can account for the majority of stagnation asymmetries experimentally observed. It uses an adaptive sampling algorithm to navigate the 24-D input parameter space to

    更新日期:2020-04-16
  • Analytic solution to charge-exchange source terms between Maxwellian and kappa-distributed velocity distributions in the heliosphere
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-03
    Anthony Michael DeStefano, Jacob Heerikhuisen

    Many space and astrophysical environments are dominated by magnetohydrodynamic plasma interactions that are virtually collisionless. However, pseudo-elastic collisions are present through mechanisms of ion-neutral charge-exchange. In this paper, we investigate how charge-exchange collisions affect the balance of momentum and energy between ions and neutrals within the plasma. Our primary application

    更新日期:2020-04-16
  • Modulation of ionospheric outflow ions by EMIC waves in the dayside outer magnetosphere
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-13
    Chen Shi, Jinsong Zhao, Chaoyan Huang, Tieyan Wang, Malcolm W. Dunlop

    Cold ions of the ionospheric origin mainly contribute to the ion population in the Earth's magnetosphere. These cold ions can be modulated by Pc5 ultralow frequency waves or wake electric fields in the dayside outer magnetosphere, through which their energy can increase to hundreds of eV. Using measurements of Magnetospheric Multiscale mission, this paper reports a new finding of the cold ion modulation

    更新日期:2020-04-16
  • Relativistic nonlinear frequency shift of laser pulse on reflection from critical layer in inhomogeneous plasma
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-02
    Satish Kumar Rajouria, Pawan Kumar

    An analytical formalism is developed for the nonlinear frequency shift of intense laser pulse, due to relativistic mass nonlinearity (in the sub-relativistic regime), on reflection from the critical layer in an inhomogeneous plasma. As a higher and higher intensity front of the pulse approaches the critical layer, the reflection layer moves forward to higher densities, due to the relativistic increase

    更新日期:2020-04-16
  • Study of laser-driven magnetic fields with a continuous wave Faraday rotation diagnostic
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-03
    V. V. Ivanov, A. V. Maximov, A. L. Astanovitskiy, I. A. Begishev, R. Betti, J. R. Davies, C. Mileham, J. D. Moody, C. Stoeckl, K. J. Swanson, N. L. Wong, J. Bromage

    Magnetic fields driven by a laser in coil targets were studied for laser energies of ∼25 J and two pulse durations of 2.8 ns and 70 ps. Axial magnetic fields in the coils were measured by continuous wave Faraday rotation diagnostics. The diagnostics indicated magnetic fields of 6–14 T in the coil and currents of 10–20 kA. Magnetic fields were compared for similar laser targets, focusing conditions

    更新日期:2020-04-16
  • Generation of quasi-monoenergetic ions using optimized hollow nanospheres
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-03
    M. A. H. Zosa, M. Murakami

    For ultra-high-intensity lasers irradiating nanometer-sized targets, Coulomb explosion (CE) is one of the main ion acceleration schemes. Previous studies have shown that the CE of solid nanospheres can produce quasi-monoenergetic ions. However, the development of optimized hollow nanospheres has yet to be achieved. Currently, the technology for the production of various types of hollow nanospheres

    更新日期:2020-04-16
  • Linearized theory of terahertz Smith–Purcell radiation from a cylindrical grating loaded with dielectric
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-04
    Zahra Rezaei, Bizhan Farokhi

    An analysis of Smith–Purcell (SP) radiation is presented for a cylindrical grating filled with dielectrics and an annular electron beam propagating along the grating axis. The dispersion relations are obtained for the azimuthally symmetric modes when the transverse perturbation of the electron beam is included, and it is compared with the case when the beam motion is restricted in the z-direction.

    更新日期:2020-04-16
  • Generation of ultrafast electron bunch trains via trapping into multiple periods of plasma wakefields
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-10
    Grigory Golovin, Vojtěch Horný, Wenchao Yan, Colton Fruhling, Daniel Haden, Junzhi Wang, Sudeep Banerjee, Donald Umstadter

    We demonstrate a novel approach to the generation of femtosecond electron bunch trains via laser-driven wakefield acceleration. We use two independent high-intensity laser pulses, a drive, and an injector, each creating their own plasma wakes. The interaction of the laser pulses and their wakes results in a periodic injection of free electrons in the drive plasma wake via several mechanisms, including

    更新日期:2020-04-16
  • Charge coupling in multi-stage laser wakefield acceleration
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-13
    N. Pathak, A. Zhidkov, Y. Sakai, Z. Jin, T. Hosokai

    The multi-stage technique in the laser driven acceleration of electrons has become a critical part for full-optical jitter-free accelerators. Several independent laser drivers and shorter plasma targets allow the stable and reproducible acceleration of electron bunches (or beam) at the GeV energies with narrower energy spreads. Moreover, the charge coupling, necessary for efficient acceleration in

    更新日期:2020-04-16
  • Enhancement of proton acceleration and conversion efficiency by double laser pulses plasma interactions
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-17
    Obaydur Rahman, Sheng-Fei Tong, Zheng-Mao Sheng

    We report an efficient scheme to improve the proton acceleration and energy conversion efficiency by using double laser pulses with foil interaction. We find a significant increase in the peak energy, the total number, and the maximum energy of the accelerated protons for the double laser pulses with foil interaction compared to those in the single laser pulse case, while the total laser energy is

    更新日期:2020-04-16
  • Ionization and acceleration of multiply charged gold ions in solid film irradiated by high intensity laser
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-20
    D. Kawahito, Y. Kishimoto

    In this paper, we present the mechanisms of ionization of a thin gold film irradiated by a high-intensity, short-pulse laser in the range of I = 10 20 − 22   W / cm 2 and the associated acceleration of multiply charged gold ions. A numerical one-dimensional simulation using an extended particle-in-cell code, which includes atomic and collisional relaxation processes, indicates that two types of acceleration

    更新日期:2020-04-16
  • Modeling radiative-shocks created by laser–cluster interactions
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-02
    R. H. H. Scott, N. Booth, S. J. Hawkes, D. R. Symes, C. Hooker, H. W. Doyle, S. I. Olsson-Robbie, H. F. Lowe, C. J. Price, D. Bigourd, S. Patankar, K. Mecseki, E. T. Gumbrell, R. A. Smith

    Radiative-shocks induced by laser–cluster interactions are modeled using radiation-hydrodynamic simulations. A good agreement—in both shock velocity and density profiles—is obtained between experiment and simulations, indicating that non-local thermodynamic equilibrium (NLTE) radiative effects are important in the experimental regime examined, particularly at early times ( ≤30 ns) due to the elevated

    更新日期:2020-04-16
  • The study of intermolecular energy transfer in a molecule-plasmon system: The effect of an electric charge
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-02
    Milad Jalilian, Nader Daneshfar

    In the present study, the transfer of energy between a pair of donor–acceptor molecules as point-like dipoles located nearby a plasmonic nanoparticle is investigated, in which an electric point charge is placed at a distance rq from the center of metallic nanoparticle or nanoshell. It is shown that the process of energy transfer between pairs of molecules is affected when an external point charge is

    更新日期:2020-04-16
  • A theoretical criterion for the closure of slots filled with low-Z foam
    Phys. Plasmas (IF 1.913) Pub Date : 2020-03-04
    Zhongheng Liu, Guangwei Meng, Yingkui Zhao

    Hydrodynamic motion of radiation-ablated high-Z plasma has a significant influence on the radiation transport in a slot. This work focuses on the closure problem of slots filled with low-Z foam of density varying from 10−2 to 100 g cm−3. A simple one-dimensional model is proposed to study the motion of the ablated high-Z wall plasma in the slot. According to the model, the high-Z plasma first expands

    更新日期:2020-04-16
  • Magnetohydrodynamic wave modes in relativistic anisotropic quantum plasma
    Phys. Plasmas (IF 1.913) Pub Date : 2020-04-16
    Archana Patidar, Prerana Sharma

    This paper presents an overview of waves and instabilities in relativistic degenerate plasma using magnetohydrodynamic double polytropic laws. The model equations are closed by the double polytropic laws. The general dispersion relation has been derived using the normal mode analysis, which consists of two interesting modes, i.e., shear Alfvén mode and modified magnetosonic modes (both slow and fast)

    更新日期:2020-04-16
  • RF current condensation in the presence of turbulent enhanced transport
    Phys. Plasmas (IF 1.913) Pub Date : 2020-04-16
    E. Rodríguez, A. H. Reiman, N. J. Fisch

    Sharp temperature gradients in a magnetically confined plasma can lead to turbulent motion of the plasma. This turbulence in turn enhances the transport of heat across magnetic field lines. The enhanced transport impacts the temperature differential that can be sustained in magnetic islands between the island center and its periphery. It is shown here that, by limiting this temperature differential

    更新日期:2020-04-16
  • First implementation of gyrokinetic exact linearized Landau collision operator and comparison with models
    Phys. Plasmas (IF 1.913) Pub Date : 2020-04-16
    Qingjiang Pan, Darin R. Ernst, Paul Crandall

    Gyrokinetic simulations are fundamental to understanding and predicting turbulent transport in magnetically confined fusion plasmas. Previous simulations have used model collision operators with approximate field-particle terms of unknown accuracy and/or have neglected collisional finite Larmor radius (FLR) effects. We have implemented the linearized Fokker–Planck collision operator with exact field-particle

    更新日期:2020-04-16
  • When does turbulence spreading matter?
    Phys. Plasmas (IF 1.913) Pub Date : 2020-04-16
    Rameswar Singh, P. H. Diamond

    Few, if any, of the many papers on turbulence spreading address the key question of how turbulence spreading actually affects the profile structure. Here, we are using a reduced model to answer that question. Turbulence spreading is most relevant near regions where the profiles support a strong intensity gradient ∇ I. One such case is at the edge of an L mode discharge, near a source of turbulence

    更新日期:2020-04-16
  • Effect of the Pfirsch–Schlüter flow on the inboard/outboard asymmetry of the toroidal flow in LHD
    Phys. Plasmas (IF 1.913) Pub Date : 2020-04-16
    Y. Yamamoto, S. Murakami, H. Takahashi, K. Ida, M. Yoshinuma, J. Chen

    Inboard/outboard asymmetry of the toroidal flow has been observed in the large helical device (LHD), especially when the radial electric field is large. We investigate the effect of the Pfirsch–Schlüter flow on the toroidal flow in LHD plasma. As a result, we find that the Pfirsch–Schlüter flow can be significantly large when the electron root solution of the neoclassical ambipolarity condition is

    更新日期:2020-04-16
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