Macroscopic Transport of Mega-ampere Electron Currents in Aligned Carbon-Nanotube Arrays

Chatterjee, Gourab; Singh, Prashant Kumar; Ahmed, Saima; Robinson, A. P. L.; Lad, Amit D.; Mondal, Sudipta; Narayanan, V.; Srivastava, Iti; Koratkar, Nikhil; Pasley, J.; Sood, A. K.; Kumar, G. Ravindra

doi:10.1103/physrevlett.108.235005

Cited by 53 publications

(45 citation statements)

References 41 publications

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“…There have been experiments [15] which have reported increased propagation distance of energetic electron beams generated by lasers in nano structured targets. The explanation for the phenomena has been provided on the basis of suppression of Weibel instability by the structured target which aids the unhindered propagation of the electrons in the medium.…”

Section: Summary and Discussionmentioning

confidence: 99%

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Observation of enhanced absorption of laser radiation by nanostructured targets in PIC simulations

Shukla

Das

2017

Physics of Plasmas

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It is well known that Brunel's vacuum heating mechanism is operative for laser energy absorption when the target plasma density rises sharply. For non-relativistic laser intensities and planar targets it is also necessary that the laser should strike the target at oblique incidence. The laser electric field at oblique incidence has a component normal to the surface to extract electrons from the target in the vacuum region for Brunel's mechanism to be operative. At relativistic laser intensities, oblique incidence is not necessarily required as the J × B force is significant and can extract electrons from the target even when the laser is at normal incidence. In this manuscript, the interaction of short and intense laser pulse with structured overdense plasma targets have been studied using 2Dparticle-in-cell simulations. It is shown that for structured targets the absorption increases many fold. A detailed study and understanding of the absorption process for the structured targets in terms of structure scale length and amplitude have been provided.

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Section: Summary and Discussionmentioning

confidence: 99%

“…There have also been indications that the laser absorption improves when structured targets are employed [12][13][14][15]. We explore this question with the help of Particle -In -Cell (PIC) studies in the present manuscript.…”

Section: Introductionmentioning

confidence: 99%

Observation of enhanced absorption of laser radiation by nanostructured targets in PIC simulations

Shukla

Das

2017

Physics of Plasmas

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“…2(d)). Our earlier measurements with a millimeter-thick amorphous carbon target (in a similar experimental condition) also showed no detectable electron in the rear side 12 . For graphite, on the other hand, the electron spectra inferred from the raw-traces (shown in Fig.…”

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confidence: 99%

“…al. 12 used polarimetric measurements of giant magnetic fields at the target rear to show that aligned carbon-nanotube arrays possess the capability to transport mega-ampere electron currents over a distance as large as a millimeter. However, intricate target designs can be challenging to fabricate and are not amenable to mass manufacturing techniques, thereby reiterating the need for simple targets.…”

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confidence: 99%

Efficient transport of femtosecond laser-generated fast electrons in a millimeter thick graphite

Adak

Singh

Lad

et al. 2016

Applied Physics Letters

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We demonstrate efficient transport of fast electrons generated by ∼1018 W/cm2, 30 fs, 800 nm laser pulses through a millimeter thick polycrystalline graphite. Measurements of hot electron spectra at the front side of the graphite target show enhancement in terms of the electron flux and temperature, while the spectra at the rear confirm the ability of the graphite to transport large electron currents over a macroscopic distance of a millimeter. In addition, protons of keV energies are observed at the rear side of such a macroscopically thick target and attributed to the target-normal-sheath-acceleration mechanism.

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“…Especially, in the work of [18], Mishra et al present an approach to achieve suppression/complete stabilization of the transverse electromagnetic beam Weibel instability by periodically modifying the electron density of background with an equilibrium density ripple, shorter than the skin depth. Recent experiments have shown that the intense laser-driven MeV electron beam can effectively transport over millimeters in carbon nanotube array, 100 times longer than the typical filament length in solid target [19].…”

Section: Introductionmentioning

confidence: 99%

The Weakened Weibel Electromagnetic Instability of Ultra-Intense Mev Electron Beams in Multi-Layer Solid Structure

Liao¹,

Zhao²

2017

PIER M

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Abstract-The Weibel instability of intense and collimated MeV fast electron beams in multi-layer structure is investigated. It is found that the electromagnetic instability of fast electron beams can be significantly suppressed by this structure. A strong magnetic field will be created at the interfaces between materials with different resistivities as these fast electrons are injected into this structure. It obstructs the transverse movement of the fast electrons and confines them to propagate along the interfaces. In consequence, the positive feedback loop between magnetic field perturbation and electrons density perturbation is broken, and the Weibel instability is thus weakened. Furthermore, the calculated results for Au/Si multi-layer structure by a hybrid Particle in Cell code have proven this weakening effect on the Weibel instability of intense fast electron beams. Because of the high energy-density delivered by the MeV electrons, these results indicate applications in high-energy physics, such as radiography, fast electron beam focusing, and perhaps fast ignition.

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Macroscopic Transport of Mega-ampere Electron Currents in Aligned Carbon-Nanotube Arrays

Cited by 53 publications

References 41 publications

Observation of enhanced absorption of laser radiation by nanostructured targets in PIC simulations

Observation of enhanced absorption of laser radiation by nanostructured targets in PIC simulations

Efficient transport of femtosecond laser-generated fast electrons in a millimeter thick graphite

The Weakened Weibel Electromagnetic Instability of Ultra-Intense Mev Electron Beams in Multi-Layer Solid Structure

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