On the role of the purely transverse Weibel instability in fast ignitor scenarios

Silva, Luı́s O.; Fonseca, Ricardo; Tonge, J.; Mori, W. B.; Dawson, J. M.

doi:10.1063/1.1476004

Cited by 247 publications

(254 citation statements)

References 11 publications

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“…21 that collisionless FI is completely shut down for a RE beam with a large transverse temperature. The instability stabilized by the RE transverse energy spread because of beam transverse temperature has already been mentioned in many previous literatures 20,37,38 . From the RE divergence, it can be estimated that the transverse temperature of REs is 480keV and a ratio of T y /T x about 0.16, where T x and T y are the RE temperature in the x and y directions, respectively, suggesting that transverse energy of the REs spreads remarkably during the RE propagating in the target.…”

Section: Resultsmentioning

confidence: 97%

Effects of filamentation instability on the divergence of relativistic electrons driven by ultraintense laser pulses

Yang

Zhuo

et al. 2016

Physics of Plasmas

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Generation of relativistic electron (RE) beams during ultraintense laser pulse interaction with plasma targets is studied by collisional particle-in-cell (PIC) simulations. Strong magnetic field with transverse scale length of several local plasma skin depths, associated with RE currents propagation in the target, is generated by filamentation instability (FI) in collisional plasmas, inducing a great enhancement of the divergence of REs compared to that of collisionless cases. Such effect is increased with laser intensity and target charge state, suggesting that the RE divergence might be improved by using low-Z materials under appropriate laser intensities in future fast ignition experiments and in other applications of laser-driven electron beams.

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Section: Resultsmentioning

confidence: 97%

Effects of filamentation instability on the divergence of relativistic electrons driven by ultraintense laser pulses

Yang

Zhuo

et al. 2016

Physics of Plasmas

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“…1, and β th 1) (Silva et al, 2002). Figure 1 also illustrates the main features of the Weibel instability, in particular, the linear growth rate scaling with γ −1/2 0 and the scaling of the saturation level of the magnetic field with v −1 th .…”

Section: Numerical Results and Physical Picturementioning

confidence: 99%

Interpenetrating Plasma Shells: Near-Equipartition Magnetic Field Generation and Nonthermal Particle Acceleration

Silva¹,

Fonseca²,

Tonge

et al. 2003

ApJ

386

411

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We present the first three-dimensional fully kinetic electromagnetic relativistic particle-in-cell simulations of the collision of two interpenetrating plasma shells. The highly accurate plasma-kinetic "particlein-cell" (with the total of 10 8 particles) parallel code OSIRIS has been used. Our simulations show: (i) the generation of long-lived near-equipartition (electro)magnetic fields, (ii) non-thermal particle acceleration, and (iii) short-scale to long-scale magnetic field evolution, in the collision region. Our results provide new insights into the magnetic field generation and particle acceleration in relativistic and subrelativistic colliding streams of particles, which are present in gamma-ray bursters, supernova remnants, relativistic jets, pulsar winds, etc..

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“…We now analyze the different instabilities that can arise in initially unmagnetized counterstreaming electron-ion flows. For our range of parameters, the electron current filamentation instability is suppressed since the flows are hot [33,34]. Moreover, the cold ion-ion-filamentation instability, which has been considered in connection with recent experiments, has a maximum theoretical growth rate…”

mentioning

confidence: 86%

Electromagnetic Field Generation in the Downstream of Electrostatic Shocks Due to Electron Trapping

et al. 2014

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A new magnetic field generation mechanism in electrostatic shocks is found, which can produce fields with magnetic energy density as high as 0.01 of the kinetic energy density of the flows on time scales ∼10 4 ω −1 pe . Electron trapping during the shock formation process creates a strong temperature anisotropy in the distribution function, giving rise to the pure Weibel instability. The generated magnetic field is well confined to the downstream region of the electrostatic shock. The shock formation process is not modified, and the features of the shock front responsible for ion acceleration, which are currently probed in laserplasma laboratory experiments, are maintained. However, such a strong magnetic field determines the particle trajectories downstream and has the potential to modify the signatures of the collisionless shock. Collisionless shocks have been studied for many decades, mainly in the context of space and astrophysics [1][2][3][4]. Recently, shock acceleration raised significant interest in the quest for a laser-based ion acceleration scheme due to an experimentally demonstrated high beam quality [5][6][7][8].Interpenetrating plasma slabs of hot electrons and cold ions are acting to set up the electrostatic fields via longitudinal plasma instabilities. The lighter electrons leaving the denser regions are held back by the electric fields, which pull the ions. Particles are trapped in the associated electrostatic potential, which steepens and eventually reaches a quasisteady-state collisionless electrostatic shock. Most of the theoretical work dates back to the 1970s [9-13] relying on the pseudo-Sagdeev potential [14] and progress has been mainly triggered by kinetic simulations [15][16][17][18].The short formation time scales and the one dimensionality of the problem make it easily accessible with theory and computer simulations. However, long time shock evolution was often one dimensional or electrostatic codes were used, and the role of electromagnetic modes was mostly neglected. More advanced multidimensional simulations have shown the importance of electromagnetic modes also in this context, due to transverse modes which are excited on the ion time scale [19,20]. We show that in the case of very high electron temperatures associated with the formation of electrostatic shocks [21], electromagnetic modes become important on electron time scales, creating strong magnetic fields in the downstream of the shock.With the increase in laser energy and intensity, the possibility to drive electrostatic shocks has become important for laboratory experiments of electrostatic shocks. Recent laser-driven shock experiments showed the appearance of an electromagnetic field structure [22][23][24], which was attributed to the ion-filamentation instability [25] that evolves on time scales of ten thousands of the inverse electron plasma frequency, ω −1 pe . As a main outcome of this Letter, we show that these structures can already be seeded and produced on tens of ω −1 pe and remain in a quasisteady state over t...

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On the role of the purely transverse Weibel instability in fast ignitor scenarios

Cited by 247 publications

References 11 publications

Effects of filamentation instability on the divergence of relativistic electrons driven by ultraintense laser pulses

Effects of filamentation instability on the divergence of relativistic electrons driven by ultraintense laser pulses

Interpenetrating Plasma Shells: Near-Equipartition Magnetic Field Generation and Nonthermal Particle Acceleration

Electromagnetic Field Generation in the Downstream of Electrostatic Shocks Due to Electron Trapping

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