Generation of a sharp density increase in radiation transport between high-Z and low-Z plasmas

Meng, Guangwei; Wang, Jianguo; Wang, Xuerong; Li, Jinghong; Zhang, Weiyan

doi:10.1016/j.mre.2016.09.001

Cited by 14 publications

(4 citation statements)

References 28 publications

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“…The cryogenic cooling temperature of the capsule is about 20 Kelvin, giving us strict restriction in choosing material of the superconducting film. Another restriction comes from the ablation process, which demands that only low-Z atoms are acceptable [13]. MgB 2 becomes the ideal choice due to the above restrictions, whose average Z-value is relatively low and superconducting critical temperature is around 39 Kelvin [14].…”

Section: Introductionmentioning

confidence: 99%

A novel superconducting magnetic levitation method to support the laser fusion capsule by using permanent magnets

Xiao

Chen

et al. 2018

Matter and Radiation at Extremes

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A novel magnetic levitation support method is proposed, which can relieve the perturbation caused by traditional support methods and provide more accurate position control of the capsule. This method can keep the perfect symmetry of the octahedral spherical hohlraum and has the characteristics in stability, tunability and simplicity. It is also favorable that all the results, such as supporting forces acting on the superconducting capsule, are calculated analytically, and numerical simulations are performed to verify these results. A typical realistic design is proposed and discussed in detail. The superconducting coating material is suggested, and the required superconducting properties are listed. Damped oscillation of the floating capsule in thin helium gas is discussed, and the restoring time is estimated.

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Section: Introductionmentioning

confidence: 99%

A novel superconducting magnetic levitation method to support the laser fusion capsule by using permanent magnets

Xiao

Chen

et al. 2018

Matter and Radiation at Extremes

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“…which can be solved with the S-N discrete coordinate scheme. [19] Here, I v is the specific intensity of radiation at frequency v, traveling in direction ⃗ Ω at position r and time t. And J v , µ ′ v , S v are the radiation emission term, the effective absorption coefficient and the radiation source, respectively.…”

Section: Simulation Model and Methods 21 A Brief Introduction To Rdmg...mentioning

confidence: 99%

Numerical Study on the Whole Process of Fireball Evolution in Strong Explosion*

Xia¹,

Chuang²,

Li³

et al. 2019

Commun. Theor. Phys.

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With the actual mean free path for radiation in air and a simplified nuclear device, a one-dimension simulation research on fireball phenomenon in a sea level atmosphere is carried out based on the multi-group radiation hydrodynamic codes (RDMG). It is shown that our theoretical calculations can describe the whole process of the fireball evolution for strong explosions from the early X-ray expansion stage to the shock wave propagation stage. The radius of the shock wave and the brightness of the fireball are in good agreement with the experimental results. The whole thermal radiation power curve of the fireball evolution for strong atmospheric explosion at sea level is plotted for the first time. The impact of radiation opacity of the nuclear device material on the early fireball phenomenon is also studied. It is found that trajectories of the radiation fronts and case shocks change with the opacity of equivalent device material. From our simulations, we find that only the early fireball depends on the details of the nuclear device, and after the formation of main shock, the evolution is determined by the properties of hot air for strong atmospheric explosion.

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“…The RH simulations performed with LARED-integration code gave an overview of the plasma conditions inside the hohlraum, as shown in figure 1. However, the interpenetration of the hohlraum wall blowoff with filled gas plasma and kinetic physics inside cannot be properly described by these RH simulations [16].…”

Section: Hypotheses For the Explanation Of Anomalous MIXmentioning

confidence: 99%

Anomalous mix induced by a collisionless shock wave in an inertial confinement fusion hohlraum

Yan¹,

Cai²,

Zhang³

et al. 2019

Nucl. Fusion

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The anomalous mix at the high-Z and low-Z plasma interfaces in an inertial confinement fusion hohlraum is a current topic of interest. The mechanism for such an anomalous mix in the interpenetration layer at the high-Z and low-Z plasma interface and its effects on the laser plasma instabilities have been investigated by particle-in-cell simulations. It is found that a diffusion-driven collisionless shock wave can be generated from an initially sharp high-Z and low-Z plasma interface with total pressure balance and constant temperature in the laser propagation channel. This purely electrostatic shock wave propagates into the high-Z plasma and leads to mix of different species of ions which is significantly faster than a classical mix in the presence of the large electric field. The mix layer width, measured as a separation distance affected by the shock, grows as δd ∝ t α , where α ∼ 1. The effect of the anomalous mix on the linear growth rate of laser plasma instabilities is evaluated.

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Generation of a sharp density increase in radiation transport between high-Z and low-Z plasmas

Cited by 14 publications

References 28 publications

A novel superconducting magnetic levitation method to support the laser fusion capsule by using permanent magnets

A novel superconducting magnetic levitation method to support the laser fusion capsule by using permanent magnets

Numerical Study on the Whole Process of Fireball Evolution in Strong Explosion*

Anomalous mix induced by a collisionless shock wave in an inertial confinement fusion hohlraum

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