Stationary Bragg reflection of laser light in inhomogeneous absorbing plasmas inside inertial confinement fusion Hohlraums
| العنوان: | Stationary Bragg reflection of laser light in inhomogeneous absorbing plasmas inside inertial confinement fusion Hohlraums |
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| المؤلفون: | Vandenboomgaerde, M., Casanova, M., Chaland, F., Bonnefille, M., Grisollet, A., Videau, L., Depierreux, S., Tassin, V., Leidinger, J. -P., Courtois, C., Garnier, J., Chen, H. |
| سنة النشر: | 2024 |
| المجموعة: | SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
| مصطلحات موضوعية: | 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS, 70 PLASMA PHYSICS AND FUSION TECHNOLOGY |
| الوصف: | Laser-produced plasma in inertial confinement fusion (ICF) Hohlraums are marked with density non-uniformity whose length scale can go down to micrometers. This scale is of the order of the laser wavelength. The WKB approximation, which is classically used in radiation-hydrodynamic codes to compute the laser trajectory, cannot correctly take into account such small-scale inhomogeneity of the plasma. Going beyond this approximation, we predict a novel mechanism for the laser reflection. Here we show that an electromagnetic plane wave with wave number k resonates with the k B =2 k Fourier component of a multimode perturbation of the background density and generates a reflected wave. It is the first time that this reflection is considered for stationary inhomogeneous ICF plasmas, and the energy absorption is taken into account. This mechanism, which is a form of Bragg reflection, can occur away from the critical surface and generate a drift of the location of the laser absorption. Furthermore, this absorption will be periodically modulated with a k B wave number. The stationary Bragg reflection can explain ongoing discrepancies between experimental and numerical data about laser trajectory and absorption in ICF Hohlraums. |
| نوع الوثيقة: | other/unknown material |
| وصف الملف: | application/pdf |
| اللغة: | unknown |
| Relation: | http://www.osti.gov/servlets/purl/2280481; https://www.osti.gov/biblio/2280481; https://doi.org/10.1063/5.0170189 |
| DOI: | 10.1063/5.0170189 |
| الاتاحة: | http://www.osti.gov/servlets/purl/2280481 https://www.osti.gov/biblio/2280481 https://doi.org/10.1063/5.0170189 |
| رقم الانضمام: | edsbas.FE4A3FD4 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1063/5.0170189 |
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