Effect of spatial nonuniformity of heating on compression and burning of a thermonuclear target under direct multibeam irradiation by a megajoule laser pulse
| العنوان: | Effect of spatial nonuniformity of heating on compression and burning of a thermonuclear target under direct multibeam irradiation by a megajoule laser pulse |
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| المؤلفون: | S. Yu. Gus’kov, Sergey G Garanin, N. V. Zmitrenko, I. Ya. Doskoch, S V Bondarenko, G. A. Vergunova, N. N. Demchenko, S. A. Bel’kov, P. A. Kuchugov, R. V. Stepanov, R. A. Yakhin, Vladislav B Rozanov |
| المصدر: | Journal of Experimental and Theoretical Physics. 124:341-351 |
| بيانات النشر: | Pleiades Publishing Ltd, 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | Range (particle radiation), Thermonuclear fusion, Materials science, business.industry, General Physics and Astronomy, Radiant energy, Laser, Kinetic energy, 01 natural sciences, 010305 fluids & plasmas, law.invention, Ignition system, Optics, law, 0103 physical sciences, 010306 general physics, business, Absorption (electromagnetic radiation), Beam (structure) |
| الوصف: | Direct-drive fusion targets are considered at present as an alternative to targets of indirect compression at a laser energy level of about 2 MJ. In this approach, the symmetry of compression and ignition of thermonuclear fuel play the major role. We report on the results of theoretical investigation of compression and burning of spherical direct-drive targets in the conditions of spatial nonuniformity of heating associated with a shift of the target from the beam center of focusing and possible laser radiation energy disbalance in the beams. The investigation involves numerous calculations based on a complex of 1D and 2D codes RAPID, SEND (for determining the target illumination and the dynamics of absorption), DIANA, and NUT (1D and multidimensional hydrodynamics of compression and burning of targets). The target under investigation had the form of a two-layer shell (ablator made of inertial material CH and DT ice) filled with DT gas. We have determined the range of admissible variation of compression and combustion parameters of the target depending on the variation of the spatial nonuniformity of its heating by a multibeam laser system. It has been shown that low-mode (long-wavelength) perturbations deteriorate the characteristics of the central region due to less effective conversion of the kinetic energy of the target shell into the internal energy of the center. Local initiation of burning is also observed in off-center regions of the target in the case of substantial asymmetry of irradiation. In this case, burning is not spread over the entire volume of the DT fuel as a rule, which considerably reduces the thermonuclear yield as compared to that in the case of spherical symmetry and central ignition. |
| تدمد: | 1090-6509 1063-7761 |
| DOI: | 10.1134/s1063776117010113 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::7d14828e0438560bc6b635128298ef89 https://doi.org/10.1134/s1063776117010113 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........7d14828e0438560bc6b635128298ef89 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10906509 10637761 |
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| DOI: | 10.1134/s1063776117010113 |