Fast Electron Transport in Ultraintense Laser Pulse Interaction with Solid Targets by Rear-Side Self-Radiation Diagnostics

Santos, J. J.; Amiranoff, F.; Baton, S. D.; Grémillet, L.; Kœnig, M.; Martinolli, E.; Gloahec, M. Rabec Le; Rousseaux, C.; Batani, D.; Bernardinello, A.; Greison, Gabriella; Hall, Tom

doi:10.1103/physrevlett.89.025001

Cited by 176 publications

(82 citation statements)

References 18 publications

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“…[18][19][20] These pioneering works lead to the establishment of scaling laws for the laser-to-electron energy conversion efficiency, 7,9,10 the electron beam current average velocity, 6 and divergence. 11,12,15,16 Other experiments were devoted to measure the range, the collimation of these electrons, and the way they lose their energy while propagating through solid samples, either foils, 8,9,13,14,17 wire targets, 21,22 or 1D-compressed foils. 18,19,23 Nonetheless, using solid or even 1D-compressed targets strongly limits the area of investigation to low temperatures (<10 eV) and moderate densities (<5g=cm 3 ), which are far from the plasma parameters of the compressed core of a driven ICF target (100 g=cm 3 , 300 eV).…”

Section: 2mentioning

confidence: 99%

“…To understand both points, numerous experiments were realized using solid targets [6][7][8][9][10][11][12][13][14][15] and a few with 1D laser-compressed targets. [18][19][20] These pioneering works lead to the establishment of scaling laws for the laser-to-electron energy conversion efficiency, 7,9,10 the electron beam current average velocity, 6 and divergence.…”

Section: 2mentioning

confidence: 99%

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Laser-driven cylindrical compression of targets for fast electron transport study in warm and dense plasmas

et al. 2011

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Fast ignition requires a precise knowledge of fast electron propagation\ud in a dense hydrogen plasma. In this context, a dedicated HiPER (High\ud Power laser Energy Research) experiment was performed on the VULCAN\ud laser facility where the propagation of relativistic electron beams\ud through cylindrically compressed plastic targets was studied. In this\ud paper, we characterize the plasma parameters such as temperature and\ud density during the compression of cylindrical polyimide shells filled\ud with CH foams at three different initial densities. X-ray and proton\ud radiography were used to measure the cylinder radius at different stages\ud of the compression. By comparing both diagnostics results with 2D\ud hydrodynamic simulations, we could infer densities from 2 to 11 g/cm(3)\ud and temperatures from 30 to 120 eV at maximum compression at the center\ud of targets. According to the initial foam density, kinetic, coupled\ud (sometimes degenerated) plasmas were obtained. The temporal and spatial\ud evolution of the resulting areal densities and electrical conductivities\ud allow for testing electron transport in a wide range of configurations.\ud (C) 2011 American Institute of Physics. {[doi: 10.1063/1.3578346]

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Section: 2mentioning

confidence: 99%

Section: 2mentioning

confidence: 99%

Laser-driven cylindrical compression of targets for fast electron transport study in warm and dense plasmas

et al. 2011

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“…The equilibrium between fast electron beam and the return currents is unstable for the Weibel instabilities, which will produce strong electromagnetic perturbation and filaments of fast electron beam. It makes the energy transport effectiveness very poor and the intense fast electrons cannot transport beyond the filament length [8][9][10][11][12][13]. For any useful applications, it is therefore of great interest to find methods to weaken Weibel instabilities and increase the transport distance of intense fast electron beams in overdense plasma.…”

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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“…Various diagnostic methods have been used to measure the fast electron divergence, such as K a X-ray emission [10], shadowgraphy [11], optical self-emission from the rear surface [12], and proton emission [13]. It is generally found that the divergence measured in the experiments increases with laser intensity [14], though some discrepancy exists among the different diagnostic methods because each one is dependent on different parameters [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of buried high-Z layers on fast electron propagation

Yang

Zhuo

et al. 2014

Eur. Phys. J. D

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Abstract.By extending a prior model [A.R. Bell, J.R. Davies, S.M. Guerin, Phys. Rev. E 58, 2471 (1998)], the magnetic field generated during the transport of a fast electron beam driven by an ultraintense laser in a solid target is derived analytically and applied to estimate the effect of such field on fast electron propagation through a buried high-Z layer in a lower-Z target. It is found that the effect gets weaker with the increase of the depth of the buried layer, the divergence of the fast electrons, and the laser intensity, indicating that magnetic field effects on the fast electron divergence as measured from Ka X-ray emission may need to be considered for moderate laser intensities. On the basis of the calculations, some considerations are made on how one can mitigate the effect of the magnetic field generated at the interface.

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Fast Electron Transport in Ultraintense Laser Pulse Interaction with Solid Targets by Rear-Side Self-Radiation Diagnostics

Cited by 176 publications

References 18 publications

Laser-driven cylindrical compression of targets for fast electron transport study in warm and dense plasmas

Laser-driven cylindrical compression of targets for fast electron transport study in warm and dense plasmas

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

Effects of buried high-Z layers on fast electron propagation

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