Laser-driven Rayleigh-Taylor instability: Plasmonic effects and three-dimensional structures

Sgattoni, A.; Sinigardi, Stefano; Fedeli, Luca; Пегораро, Ф.; Macchi, Andrea

doi:10.1103/physreve.91.013106

Cited by 76 publications

(72 citation statements)

References 44 publications

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“…In cases where the particle flux was too high to obtain quantitative data from CR-39, it was useful to etch for a short period of time (<3 minutes) to obtain a coarse beam profile for low energy carbon ions (<10 MeV/u) as shown in three shots in Figure 6(a) which have contrasting beam profiles. It was generally observed throughout the experiment that protons and carbon transverse profiles displayed similar broad characteristics at comparable energy per nucleon, as also indicated by particle-in-cell (PIC) simulations of the acceleration process [12].…”

Section: Rcf and Cr-39 Layerssupporting

confidence: 57%

Angularly resolved characterization of ion beams from laser-ultrathin foil interactions

et al. 2016

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Methods and techniques used to capture and analyze beam profiles produced from the interaction of intense, ultrashort laser pulses and ultrathin foil targets using stacks of Radiochromic Film (RCF) and Columbia Resin #39 (CR-39) are presented. The identification of structure in the beam is particularly important in this regime, as it may be indicative of the dominance of specific acceleration mechanisms. Additionally, RCF can be used to deconvolve proton spectra with coarse energy resolution while mantaining angular information across the whole beam.

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Section: Rcf and Cr-39 Layerssupporting

confidence: 57%

Angularly resolved characterization of ion beams from laser-ultrathin foil interactions

et al. 2016

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“…The total simulation time is tsim = 1000 Tp, where Tp = 2π/ωp, and the temporal resolution is ∆t = 0.01 Tp. For the 2D T -mode case, the open-source code PICCANTE (Sgattoni et al 2014;Sgattoni et al 2015), optimized for parallel simulations, has been used. In this case the box had 2000 × 2000 cells and lengths Lg,x × Lg,y = 100 λp × 100 λp so ∆x = ∆y = 0.05 λp.…”

Section: Numerical Set-upmentioning

confidence: 99%

Particle acceleration and radiation friction effects in the filamentation instability of pair plasmas

D'Angelo¹,

Fedeli²,

Sgattoni³

et al. 2015

Mon. Not. R. Astron. Soc.

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The evolution of the filamentation instability produced by two counter-streaming, ultrarelativistic pair plasmas is studied with particle-in-cell simulations. Radiation friction effects are taken into account. Two dimensional simulations are performed for both cases of the initial momenta being perpendicular (T -mode) or parallel (P -mode) to the simulation plane. In the initial stage the instability is purely transverse for both modes and generates small-scale filaments which later merge into larger structures. Particle acceleration leads to a strong broadening of the energy spectrum with the formation of a peak at twice the initial energy for the T -mode. In the nonlinear stage significant differences between T -and P -modes in the evolution of the fields and in the spectra of accelerated particles are apparent. The presence of radiative losses does not change the dynamics of the instability but strongly affects the structure of the particle spectra in the ultra-relativistic regime (particle energy > 100 MeV) and for high plasma densities (> 10 21 cm −3 ).

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“…The expected diffraction pattern is approximately circular and this is observed in the simulation at early times when the plasma aperture is small. With increasing laser intensity, plasma electrons are swept from side to side along the axis of polarization by the laser E-field [31,32], giving rise to the striped pattern observed in Fig. 5f.…”

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confidence: 97%

Optically controlled dense current structures driven by relativistic plasma aperture-induced diffraction

et al. 2016

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(2016). Optically controlled dense current structures driven by relativistic plasma aperture-induced diffraction. Nature Physics, 12, 505-512. DOI: 10.1038/nphys3613 General rights Copyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights.Take down policy The Research Portal is Queen's institutional repository that provides access to Queen's research output. Every effort has been made to ensure that content in the Research Portal does not infringe any person's rights, or applicable UK laws. If you discover content in the Research Portal that you believe breaches copyright or violates any law, please contact openaccess@qub.ac.uk. AbstractThe collective response of charged particles to intense fields is intrinsic to plasma accelerators and radiation sources, relativistic optics and many astrophysical phenomena. Here we show that the fundamental optical process of diffraction of intense laser light occurs via the self-generation of a relativistic plasma aperture in thin foils undergoing relativistic induced transparency. The plasma electrons collectively respond to the resulting near-field diffraction pattern, producing a beam of energetic electrons with spatial structure which can be controlled by variation of the laser pulse parameters. It is shown that static electron beam, and induced magnetic field, structures can be made to rotate at fixed or variable angular frequencies depending on the degree of ellipticity in the laser polarization. The concept is demonstrated numerically and verified experimentally. It is a viable step towards optical control of charged particle dynamics in laser-driven sources. * Electronic address: paul.mckenna@strath.ac.uk 1 The formation of current structures due to the collective response of charged particles to a perturbation is one of the most fundamental properties of plasma. This is manifest in plasma dynamics ranging from flares and X-ray jets on the sun to disruptive instabilities in fusion plasmas. This feature is also exploited to great effect in the development of compact laser-based particle accelerators and radiation sources, which have wide-ranging potential applications in science, medicine and industry. Controlling the collective motion of plasma electrons in response to perturbation produced by intense laser light is key to the development of these novel sources. Pertinent examples in plasma with density low enough for laser light to propagate (underdense plasma) include the self-generated plasma cavity or 'bubble' produced in laser-driven wakefield acceleration [1] and plasma channels [2]. These structures are formed principally by the ponderomotive force induced by the propagating laser pulse, which expels electrons from the regions of high laser intensity, and by self-generated fields induced by the current displacement [3]. Sh...

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Laser-driven Rayleigh-Taylor instability: Plasmonic effects and three-dimensional structures

Cited by 76 publications

References 44 publications

Angularly resolved characterization of ion beams from laser-ultrathin foil interactions

Angularly resolved characterization of ion beams from laser-ultrathin foil interactions

Particle acceleration and radiation friction effects in the filamentation instability of pair plasmas

Optically controlled dense current structures driven by relativistic plasma aperture-induced diffraction

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