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

Vauzour, B.; Pérez, F.; Volpe, L.; Lancaster, Kate; Nicolaï, Ph.; Batani, D.; Baton, S. D.; Beg, F. N.; Benedetti, C.; Brambrink, E.; Chawla, S.; Dorchies, F.; Fourment, C.; Galimberti, M.; Gizzi, L. A.; Heathcote, R.; Higginson, D. P.; Hulin, S.; Jafer, R.; Köster, P.; Labate, L.; Mackinnon, A. J.; MacPhee, A. G.; Nazarov, W.; Pasley, J.; Regan, Ciaran M.; Ribeyre, X.; Richetta, M.; Schurtz, G.; Sgattoni, A.; Santos, J. J.

doi:10.1063/1.3578346

Cited by 18 publications

(9 citation statements)

References 45 publications

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“…200 μm-long hollow cylinders, filled with CH foams of densities ρ 0 = 0.1 g cm −3 and 1 g cm −3 , were enclosed Table 1. Parameters of the radially compressed cylindric targets at stagnation time (Vauzour et al 2011).…”

Section: Electron Transport In Radial Shock-driven Plastic Foamsmentioning

confidence: 99%

Supra-thermal electron beam stopping power and guiding in dense plasmas

Santos¹,

Batani²,

Baton

et al. 2013

J. Plasma Phys.

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Fast-electron beam stopping mechanisms in media ranging from solid to warm dense matter have been investigated experimentally and numerically. Laser-driven fast electrons have been transported through solid Al targets and shock-compressed Al and plastic foam targets. Their propagation has been diagnosed via rear-side optical self-emission and Kα X-rays from tracer layers. Comparison between measurements and simulations shows that the transition from collision-dominated to resistive field-dominated energy loss occurs for a fast-electron current density ~5 × 1011 A cm−2. The respective increases in the stopping power with target density and resistivity have been detected in each regime. Self-guided propagation over 200μm has been observed in radially compressed targets due to ~1kT magnetic fields generated by resistivity gradients at the converging shock front.

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Section: Electron Transport In Radial Shock-driven Plastic Foamsmentioning

confidence: 99%

Supra-thermal electron beam stopping power and guiding in dense plasmas

Santos¹,

Batani²,

Baton

et al. 2013

J. Plasma Phys.

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“…A X-ray radiography 14 was also used as a diagnostics of implosions using a Kα source emitting at hν ≈ 4.5 keV. Again the time between the short-pulse beam producing the X-rays and the ns-compression beam was changed thus allowing probing the target at different times.…”

Section: Experiments On Fast Electron Propagation In Compressed Matermentioning

confidence: 99%

Experimental results performed in the framework of the HIPER European Project

et al. 2011

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This paper presents the goals and some of the results of experiments conducted within the Working Package 10 (Fusion Experimental Programme) of the HiPER Project. These experiments concern the study of the physics connected to "Advanced Ignition Schemes", i.e. the Fast Ignition and the Shock Ignition Approaches to Inertial Fusion. Such schemes are aimed at achieving a higher gain, as compared to the classical approach which is used in NIF, as required for future reactors, and making fusion possible with smaller facilities. In particular, a series of experiments related to Fast Ignition were performed at the RAL (UK) and LULI (France) Laboratories and were addressed to study the propagation of fast electrons (created by a short-pulse ultra-high-intensity beam) in compressed matter, created either by cylindrical implosions or by compression of planar targets by (planar) laser-driven shock waves. A more recent experiment was performed at PALS and investigated the laser-plasma coupling in the 10 16 W/cm 2 intensity regime of interest for Shock Ignition.

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“…Fast electron transport experiments in cylindrical targets without an external B-field have been conducted [24][25][26][27], highlighting the importance of a self-generated B-field associated with the resistivity gradient on the implosion front, which can guide the electron beam under the right conditions. This scheme is also compatible with an axial B-field to guide the high-energy electron beam in FI, in which both self-generated B-field and compressed external B-field can reduce the electron divergence.…”

Section: Introductionmentioning

confidence: 99%

Fast electron transport dynamics and energy deposition in magnetized, imploded cylindrical plasma

Kawahito

Bailly-Grandvaux

Dozières

et al. 2020

Phil. Trans. R. Soc. A.

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Inertial confinement fusion approaches involve the creation of high-energy-density states through compression. High gain scenarios may be enabled by the beneficial heating from fast electrons produced with an intense laser and by energy containment with a high-strength magnetic field. Here, we report experimental measurements from a configuration integrating a magnetized, imploded cylindrical plasma and intense laser-driven electrons as well as multi-stage simulations that show fast electrons transport pathways at different times during the implosion and quantify their energy deposition contribution. The experiment consisted of a CH foam cylinder, inside an external coaxial magnetic field of 5 T, that was imploded using 36 OMEGA laser beams. Two-dimensional (2D) hydrodynamic modelling predicts the CH density reaches 9.0 g cm − 3 , the temperature reaches 920 eV and the external B-field is amplified at maximum compression to 580 T. At pre-determined times during the compression, the intense OMEGA EP laser irradiated one end of the cylinder to accelerate relativistic electrons into the dense imploded plasma providing additional heating. The relativistic electron beam generation was simulated using a 2D particle-in-cell (PIC) code. Finally, three-dimensional hybrid-PIC simulations calculated the electron propagation and energy deposition inside the target and revealed the roles the compressed and self-generated B-fields play in transport. During a time window before the maximum compression time, the self-generated B-field on the compression front confines the injected electrons inside the target, increasing the temperature through Joule heating. For a stronger B-field seed of 20 T, the electrons are predicted to be guided into the compressed target and provide additional collisional heating. This article is part of a discussion meeting issue ‘Prospects for high gain inertial fusion energy (part 2)’.

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

Cited by 18 publications

References 45 publications

Supra-thermal electron beam stopping power and guiding in dense plasmas

Supra-thermal electron beam stopping power and guiding in dense plasmas

Experimental results performed in the framework of the HIPER European Project

Fast electron transport dynamics and energy deposition in magnetized, imploded cylindrical plasma

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