Conditions established in a laser thermonuclear reactor chamber by a microexplosion of a target

Afanas'ev, Yurii V; Basov, N G; Volosevich, P. P.; Gamalii, E. G.; Isakov, A. I.; Крохин, О. Н.; Kurdyumov, S. P.; Розанов, В. Б.; Samarskiî, A. A.; Соболевский, Н. М.

doi:10.1070/qe1975v005n06abeh011304

Cited by 9 publications

(9 citation statements)

References 1 publication

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“…The structure of such quasi-stationary ablation fronts has been extensively studied under various simplifying assumptions for more than 40 years. [3][4][5][6][7] However, in all the previous publications (at least to our knowledge), the authors always assumed that the key processes, defining the structure of the ablation front, were the electron thermal conduction and the absorption of laser light combined with an appropriate version of the hydrodynamics model. Possible role of energy transport by thermal radiation has mostly been ignored.…”

Section: Introductionmentioning

confidence: 99%

On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas

2015

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The effect of strong thermal radiation on the structure of quasi-stationary laser ablation fronts is investigated under the assumption that all the laser flux is absorbed at the critical surface. Special attention is paid to adequate formulation of the boundary-value problem for a steady-state planar ablation flow. The dependence of the laser-to-x-ray conversion efficiency / r on the laser intensity I L and wavelength k L is analyzed within the non-equilibrium diffusion approximation for radiation transfer. The scaling of the main ablation parameters with I L and k L in the strongly radiative regime 1 À / r ( 1 is derived. It is demonstrated that strongly radiating ablation fronts develop a characteristic extended cushion of "radiation-soaked" plasma between the condensed ablated material and the critical surface, which can efficiently suppress perturbations from the instabilities at the critical surface. V C 2015 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas

2015

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“…Traditionally, low fluence thermal ablation of material surfaces by short (pico , nano , and micro second) laser pulses is considered as preceding their high fluence erosive plasma formation [1][2][3]; such plasma onset is usually initiated by optical breakdown within an ablative thermal plume [3]. This viewpoint is also typical for ablation by ultrashort (mostly, femto second) laser pulses [4,5], even though in this case thermal dynamics is preceded by high temperature electronic dynamics and electron emission [6][7][8], with the latter saturating at low fluences F ~ 1-10 mJ/cm 2 because of the blocking effect of the related electron space charge [6].…”

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confidence: 99%

Electron emission and ultrafast low-fluence plasma formation during single-shot femtosecond laser surface ablation of various materials

et al. 2015

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Emission of erosive plasma has been observed during electric probe and optical emission spectral measure ments of plumes produced by single shot femtosecond laser ablation of optical quality surfaces of various materials-copper, titanium, and silicon-at laser fluences well below the corresponding thermal ablation thresholds, replacing presumably electron emission at lower fluences. The onset of erosive plasma correlates on the fluence scale with saturation of dependences of self reflectivity of the pumping femtosecond laser pulses, reflecting the "freezing" of electron dynamics (variation of electron density or temperature) during the pumping pulses, despite the monotonically increasing laser fluences.

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“…An assessment of inhomogeneity of laser energy absorption was done by using RAPID [6] and SEND [3,7] numerical codes. The first one solves equations of one-dimensional two-temperature hydrodynamics together with Maxwell's equations to determine a part of incident laser energy absorbed in the target, the second one is responsible for the calculation of target heating uniformity by multi-beam laser system.…”

Section: Modeling Of the Inhomogeneity Of Laser Energy Absorption In mentioning

confidence: 99%

Analysis of the symmetry of the direct-drive target implosion under laser pulse of a megajoule scale

Demchenko

Gus'kov

Kuchugov

et al. 2016

J. Phys.: Conf. Ser.

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Abstract. The class of direct-drive targets for the laser pulse of a megajoule scale is considered in the work. A distinctive feature of the design of these targets is a relatively low aspect ratio (outer DT-shell radius/shell thickness, A ∼ 10) to provide greater compression stability. The irradiation of the target surface is carried out by the shaped laser pulse on 2ω of Nd-laser. The influence of laser energy absorption inhomogeneity on the parameters of compression and burning of thermonuclear fuel on the final stage of implosion is studied in the work based on 1D and 2D numerical calculations. The results of 2D modeling show that in the case of target's offset from the point of beams crossing significantly greater reduction in the neutron yield is observed than in the case when only irregularities caused by the geometry of irradiation by the finite number of beams are taken into account.

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Conditions established in a laser thermonuclear reactor chamber by a microexplosion of a target

Cited by 9 publications

References 1 publication

On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas

On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas

Electron emission and ultrafast low-fluence plasma formation during single-shot femtosecond laser surface ablation of various materials

Analysis of the symmetry of the direct-drive target implosion under laser pulse of a megajoule scale

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