One of the applications of the Z-pinch technique is dynamic hohlraum driven inertial confinement fusion (ICF). This dynamic hohlraum is created by accelerating high-Z plasma to impact low-Z material through the magnet...
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ISBN:
(数字)9798350360912
ISBN:
(纸本)9798350360929
One of the applications of the Z-pinch technique is dynamic hohlraum driven inertial confinement fusion (ICF). This dynamic hohlraum is created by accelerating high-Z plasma to impact low-Z material through the magnetic field generated by pulse current. The interface between the high-Z plasma and the magnetic field is susceptible to Magneto-Rayleigh-Taylor (MRT) instability, which can lower the performance of the dynamic hohlraum. Understanding the relationship between the MRT instability and the rise time of the pulse current is crucial for achieving ignition in Z-pinch ICF. Initially, the scaling of MRT instability with the current rise time was investigated using theoretical and numerical methods. The study revealed that the perturbation amplitude of the instability increases linearly with the current rise time for the same implosion velocity when the Z-pinch constant coefficient is kept. To validate this finding, three types of wire-array experiments were conducted with similar implosion dynamics and nearly identical implosion velocities on an 8 MA pulse power generator. It is for the first time to achieve similar wire-array Z-pinch implosions while scaling up the current rise time to three times on the generator. The experimental outcomes, which included the shape of x-ray radiation and x-ray images of imploding plasmas, along with corresponding numerical analysis, confirmed that the MRT instability before stagnation indeed increases linearly with the rise time, consistent with the predictions of the theoretical model.
To address the visualization problem of surface streamline on complex curved surfaces, we present and implement an efficient surface streamline generation method for visualizing vector field on arbitrary geometry. The...
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An efficient massively parallel computing program for shock wave propagation named Shock3d is developed for shock wave damage mechanism in complex scenes. With the finite volume method, the program is built upon JASMI...
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We present an $$L^2$$ norm convergence of the implicit-explicit BDF2 scheme with variable-step for the unsteady incompressible Navier-Stokes equations with an inf-sup stable FEM for the space discretization. Under a w...
We present an $$L^2$$ norm convergence of the implicit-explicit BDF2 scheme with variable-step for the unsteady incompressible Navier-Stokes equations with an inf-sup stable FEM for the space discretization. Under a weak step-ratio constraint $$0
The elasticity under varying temperatures and pressures is particularly significant for understanding mechanical properties and structural phase transitions. Consequently, there is an increasing demand for tools capab...
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The radiative transfer equations (RTEs) are important in the study of inertial confinement fusion (ICF). Cylindrical configurations are commonly employed in ICF studies, such as at the National Ignition Facility. Ther...
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The Tensor Train (TT) approach for the numerical solution of the discretized Boltzmann neutron transport equation (NTE) has shown great promise due to its low-rank approximation of the absorption/leakage, scattering, ...
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We present measurements of the 2p-3d transition opacity of a hot molybdenum-scandium sample with nearly half-vacant molybdenum M-shell configurations.A plastic-tamped molybdenum-scandium foil sample is radiatively hea...
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We present measurements of the 2p-3d transition opacity of a hot molybdenum-scandium sample with nearly half-vacant molybdenum M-shell configurations.A plastic-tamped molybdenum-scandium foil sample is radiatively heated to high temperature in a compact D-shaped gold Hohlraum driven by∼30 kJ laser energy at the SG-100 kJ laser facility.X rays transmitted through the molybdenum and scandium plasmas are diffracted by crystals and finally recorded by image *** electron temperatures in the sample in particular spatial and temporal zones are determined by the K-shell absorption of the scandium plasma.A combination of the IRAD3D view factor code and the MULTI hydrodynamic code is used to simulate the spatial distribution and temporal behavior of the sample temperature and *** inferred temperature in the molybdenum plasma reaches a average of 138±11 eV.A detailed configuration-accounting calculation of the n=2–3 transition absorption of the molybdenum plasma is compared with experimental measurements and quite good agreement is *** present measurements provide an opportunity to test opacity models for complicated M-shell configurations.
In this paper, we introduce a general numerical method to approximate the reproduction numbers of a large class of multi-group, age-structured, population models with a finite age span. To provide complete flexibility...
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In this paper, we introduce a general numerical method to approximate the reproduction numbers of a large class of multi-group, age-structured, population models with a finite age span. To provide complete flexibility in the definition of the birth and transition processes, we propose an equivalent formulation for the age-integrated state within the extended space framework. Then, we discretize the birth and transition operators via pseudospectral collocation. We discuss applications to epidemic models with continuous and piecewise continuous rates, with different interpretations of the age variable (e.g., demographic age, infection age and disease age) and the transmission terms (e.g., horizontal and vertical transmission). The tests illustrate that the method can compute different reproduction numbers, including the basic and type reproduction numbers as special cases. c 2024 the Author(s), licensee AIMS Press.
Competition among the two-plasmon decay(TPD)of backscattered light of stimulated Raman scattering(SRS),filamentation of the electron-plasma wave(EPW)and forward side SRS is investigated by two-dimensional particlein-c...
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Competition among the two-plasmon decay(TPD)of backscattered light of stimulated Raman scattering(SRS),filamentation of the electron-plasma wave(EPW)and forward side SRS is investigated by two-dimensional particlein-cell *** previous work[*** et al.,*** 58,096035(2018)]showed that in a plasma with the density near 1/10 of the critical density,the backscattered light would excite the TPD,which results in suppression of the backward ***,this work further shows that when the laser intensity is so high(>10^(16)W/cm^(2))that the backward SRS cannot be totally suppressed,filamentation of the EPW and forward side SRS will be *** the TPD of the backscattered light only occurs in the early stage and is suppressed in the latter *** distribution functions further show that trapped-particle-modulation instability should be responsible for filamentation of the *** research can promote the understanding of hot-electron generation and SRS saturation in inertial confinement fusion experiments.
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