Transition from Collisional to Collisionless Regimes in Interpenetrating Plasma Flows on the National Ignition Facility

Ross, J. S.; Higginson, Drew; Ryutov, D. D.; Fiúza, Frederico; Hatarik, R.; Huntington, C. M.; Kalantar, D. H.; Link, A.; Pollock, B. B.; Remington, B. A.; Rinderknecht, H. G.; Swadling, G. F.; Turnbull, D.; Weber, S. V.; Wilks, S. C.; Froula, D. H.; Rosenberg, Michael J.; Morita, T.; Sakawa, Y.; Takabe, H.; Drake, R. P.; Kuranz, Carolyn; Gregori, G.; Meinecke, J.; Levy, M. C.; Kœnig, M.; Spitkovsky, Anatoly; Petrasso, R. D.; Li, C. K.; Sio, H.; Lahmann, B.; Zylstra, A. B.; Park, H. S.

doi:10.1103/physrevlett.118.185003

Cited by 57 publications

(34 citation statements)

References 34 publications

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“…In parallel, laser-plasma facilities are on the verge of producing electron-ion collisionless shocks in the laboratory (e.g. Huntington et al 2015;Ross et al 2017), and production of collisionless shocks in pair plasmas may be possible in a near future (e.g. Chen et al 2015;Lobet et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Perpendicular relativistic shocks in magnetized pair plasma

Plotnikov

Grassi

Grech

2018

Monthly Notices of the Royal Astronomical Society

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Perpendicular relativistic (γ 0 = 10) shocks in magnetized pair plasmas are investigated using two dimensional Particle-in-Cell simulations. A systematic survey, from unmagnetized to strongly magnetized shocks, is presented accurately capturing the transition from Weibelmediated to magnetic-reflection-shaped shocks. This transition is found to occur for upstream flow magnetizations 10 −3 < σ < 10 −2 at which a strong perpendicular net current is observed in the precursor, driving the so-called current-filamentation instability. The global structure of the shock and shock formation time are discussed. The MHD shock jump conditions are found in good agreement with the numerical results, except for 10 −4 < σ < 10 −2 where a deviation up to 10% is observed. The particle precursor length converges toward the Larmor radius of particles injected in the upstream magnetic field at intermediate magnetizations. For σ > 10 −2 , it leaves place to a purely electromagnetic precursor following from the strong emission of electromagnetic waves at the shock front. Particle acceleration is found to be efficient in weakly magnetized perpendicular shocks in agreement with previous works, and is fully suppressed for σ > 10 −2 . Diffusive Shock Acceleration is observed only in weakly magnetized shocks, while a dominant contribution of Shock Drift Acceleration is evidenced at intermediate magnetizations. The spatial diffusion coefficients are extracted from the simulations allowing for a deeper insight into the self-consistent particle kinematics and scale with the square of the particle energy in weakly magnetized shocks. These results have implications for particle acceleration in the internal shocks of AGN jets and in the termination shocks of Pulsar Wind Nebulae.

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Section: Introductionmentioning

confidence: 99%

Perpendicular relativistic shocks in magnetized pair plasma

Plotnikov

Grassi

Grech

2018

Monthly Notices of the Royal Astronomical Society

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“…We return to the simple analytic model of Section II and derive the expected dominant spatial mode of the proton image of a system containing many filaments. By Fourier transforming the proton image defined in equation (12) we find…”

Section: A Analytic Solutionmentioning

confidence: 99%

Characterizing filamentary magnetic structures in counter-streaming plasmas by Fourier analysis of proton images

et al. 2019

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Proton imaging is a powerful tool for probing electromagnetic fields in a plasma, providing a path-integrated map of the field topology. However, in cases where the field structure is highly inhomogeneous, inferring spatial properties of the underlying field from proton images can be difficult. This problem is exemplified by recent experiments which used proton imaging to probe the filamentary magnetic field structures produced by the Weibel instability in collisionless counter-streaming plasmas. In this paper, we perform analytical and numerical analysis of proton images of systems containing many magnetic filaments. We find that, in general, the features observed on proton images do not directly correspond to the spacing between magnetic filaments (the magnetic wavelength) as has previously been assumed, and that they instead correspond to the filament size. We demonstrate this result by Fourier analysis of synthetic proton images for many randomized configurations of magnetic filaments. Our results help guide the interpretation of experimental proton images of filamentary magnetic structures in plasmas.

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“…and ej is the collision frequency between electrons and the ion species j. Inserting this into the original push in (12) gives the push in the hd-PIC formulation…”

Section: Hydrodynamic Particle-in-cell Simulations Of Interpenetmentioning

confidence: 99%

“…In this k ) L regime, the dynamics are dominated by long-range, collective electromagnetic (EM) forces, such as the Weibel-filamentation instability 4 that can create EM instabilities and potentially collisionless shocks. Using appropriate scaling relations, [5][6][7] such astrophysical scenarios can be studied in the laboratory using high-energy lasers; this is currently an active area of research experimentally, 3,[8][9][10][11][12] theoretically, 6,13 and computationally. [14][15][16][17] On the other hand, laser-driven inertial confinement fusion (ICF) experiments often occur at high density such that the plasma is very collisional and k is small.…”

Section: Introductionmentioning

confidence: 99%