Enhanced transport of relativistic electrons through nanochannels

Singh, Prashant Kumar; Chakraborty, Indrani; Chatterjee, Gourab; Adak, Amitava; Lad, Amit D.; Brijesh, P.; Ayyub, Pushan; Kumar, G. Ravindra

doi:10.1103/physrevstab.16.063401

Cited by 7 publications

(3 citation statements)

References 29 publications

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“…Aiming at enhancing the laser-plasma coupling, in recent years, a large effort was dedicated to testing targets containing micro-or nanostructures, which in many cases, have given evidence of a larger absorptivity of laser radiation and of an enhancement of bremsstrahlung or Kα x-ray yield, one to two orders of magnitude higher than that obtained by standard flat targets [1][2][3][4][5][6][7][8][9][10][11][12], and of a higher amount and temperature of the hot electrons generated [4,[13][14][15][16]. The mechanisms able to produce an enhancement of the absorptivity of a nanoor micro-structured target can be various, depending on the geometry and dimensions of the structures.…”

Section: Introductionmentioning

confidence: 99%

Investigation on laser–plasma coupling in intense, ultrashort irradiation of a nanostructured silicon target

Cristoforetti

Anzalone

Baffigi

et al. 2014

Plasma Phys. Control. Fusion

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One of the most interesting research fields in laser-matter interaction studies is the investigation of effects and mechanisms produced by nano-or micro-structured targets, mainly devoted to the enhancing of laser-target or laser-plasma coupling. In intense and ultra-intense laser interaction regimes, the observed enhancement of x-ray plasma emission and/or hot electron conversion efficiency is explained by a variety of mechanisms depending on the dimensions and shape of the structures irradiated. In the present work, the attention is mainly focused on the lowering of the plasma formation threshold which is induced by the larger absorptivity.Flat and nanostructured silicon targets were here irradiated with an ultrashort laser pulse, in the range 1 × 10 17 -2 × 10 18 W µm 2 cm −2 . The effects of structures on laser-plasma coupling were investigated at different laser pulse polarizations, by utilizing x-ray yield and 3/2ω harmonics emission. While the measured enhancement of x-ray emission is negligible at intensities larger than 10 18 W µm 2 cm −2 , due to the destruction of the structures by the amplified spontaneous emission (ASE) pre-pulse, a dramatic enhancement, strongly dependent on pulse polarization, was observed at intensities lower than ∼3.5 × 10 17 W µm 2 cm −2 . Relying on the three-halves harmonic emission and on the non-isotropic character of the x-ray yield, induced by the two-plasmon decay instability, the results are explained by the significant lowering of the plasma threshold produced by the nanostructures. In this view, the strong x-ray enhancement obtained by s-polarized pulses is produced by the interaction of the laser pulse with the preplasma, resulting from the interaction of the ASE pedestal with the nanostructures.

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Section: Introductionmentioning

confidence: 99%

Investigation on laser–plasma coupling in intense, ultrashort irradiation of a nanostructured silicon target

Cristoforetti

Anzalone

Baffigi

et al. 2014

Plasma Phys. Control. Fusion

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“…In order to suppress the formation of filaments the electron beam can be confined to tightly collimated beams. This collimating effect has been observed in nano-structured targets made from carbon nano-tubes 17 , nano-channels fabricated from metallic elements 18 where the transverse motion of the fast electrons was limited by the channels.…”

Section: Introductionmentioning

confidence: 77%

Role of low temperature resistivity on fast electron transport in disordered aluminium and copper

2015

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To determine the link between the onset of the filamentation instability and the low temperature resistivity of the cold-electron plasma a comparison between the transport of fast electrons through disordered aluminium and copper targets is made using the hybrid code Zephyros. The filamentation instability is suppressed at laser intensities below 5×10 19 W cm −2 for materials where the resistivity of the material is lower than 1µΩm at 1eV. Interestingly copper targets show larger resistive magnetic field growth, and as a result more collimation of the electron beam, despite having a consistently smaller resistivity at lower temperatures than that of aluminium. The increase in magnetic field strength is responsible for the suppression of the filamentation instability. This is due to the resistive filamentation growth rate for copper and aluminium, under identical conditions, being numerically very close.

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“…On the other hand, when the d 0 is too large (for example l = d 0.5 0 ), the background plasma average areal density of the R 4 for the case II is so high that the energy loss increases rapidly in the transport process. The energy loss of fast electrons can be approximatively proportional to the total background plasma areal density r ´l [44,45], where ρ is the background plasma average density and l is the corresponding thickness. From figure 9, we can observe that the background plasma average areal density ratio of the R 4 to R 3 increases with the increase of the d 0 (the blue curve figure 9).…”

Section: Effect Of the Target Parameters On Transport Of Fast Electronsmentioning

confidence: 99%

Guiding and collimating the fast electrons by using a low-density-core target with buried high density layers

Wan

Hou

et al. 2016

Plasma Phys. Control. Fusion

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A low-density-core target with buried high density layers is proposed to improve the transport of fast electrons and involved problems are investigated by using two-dimensional particle-in-cell simulations. It is demonstrated that this target can collimate the fast electrons efficiently and lead to a better beam quality. The enhancement is attributed to the weakening of the two stream instability and the better collimation by the self-generated multilayer megagauss magnetic field as well as the baroclinic magnetic field. Comparing this to that without buried high density layers, the energy flux of fast electrons is increased by a factor of about 1.8 and has a narrower transverse distribution in space. Besides, the dependence of the efficiency on the target parameters is examined, and the optimal target parameters are also obtained. Such a target can be useful to many applications, such as fast ignition in inertial fusion.

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Enhanced transport of relativistic electrons through nanochannels

Cited by 7 publications

References 29 publications

Investigation on laser–plasma coupling in intense, ultrashort irradiation of a nanostructured silicon target

Investigation on laser–plasma coupling in intense, ultrashort irradiation of a nanostructured silicon target

Role of low temperature resistivity on fast electron transport in disordered aluminium and copper

Guiding and collimating the fast electrons by using a low-density-core target with buried high density layers

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