Numerical Simulation of 2-D Radiation-Drive Ignition Implosion Process

Huang, Yong; Song, Peng; Zhai, Chao; Kang, Dongguo; Gu, Jiayang; Hang, Xudeng; Gu, Peng; Jiang, Song

doi:10.1088/0253-6102/59/6/15

Cited by 32 publications

(8 citation statements)

References 10 publications

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“…Understanding the source of this non-implosion neutron yield and reducing its level are of essential importance for inferring the feasibility of FI. In the present work, we investigate the neutron generation mechanism by radiation-hydrodynamic simulations [6,7] and particle-in-cell simulations [8,9]. Radiation-hydrodynamic (RH) simulations show that the gold (Au) plasma ablated from hohlraum wall can collide with the capsule corona plasma.…”

Section: Anomalous Neutron Yield In Indirect-drive Inertial-confineme...mentioning

confidence: 99%

Anomalous neutron yield in indirect-drive inertial-confinement-fusion due to the formation of collisionless shocks in the corona

Zhang

Cai

Shan³

et al. 2017

Nucl. Fusion

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Observations of anomalous neutron yield in the indirect-drive inertial confinement fusion implosion experiments conducted at SG-III prototype and SG-II upgrade laser facilities are interpreted. The anomalous mechanism results in a neutron yield which is 100-times higher than that predicted by 1D radiation-hydrodynamic simulations. 2D radiation-hydrodynamic simulations show that the supersonic, radially directed gold (Au) plasma jets arising from the laser-hohlraum interactions can collide with the carbon-deuterium (CD) corona plasma of the compressed pellet. It is found that in the interaction front of the high-Z jet with the low-Z corona, with low density ∼ − 10 cm 20 3 and high temperature ∼keV, kinetic effects become important. Particle-in-cell simulations indicate that an electrostatic shock wave can be driven when the high-temperature Au jet expands into the low-temperature CD corona. Deuterium ions with an amount of ∼10 15 can be accelerated to ∼25 keV by the collisionless shock wave, thus causing efficient neutron productions though the beam-target method by stopping these energetic ions in the corona. The evaluated neutron yield is consistent with the experiments conducted at SG laser facilities.

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Section: Anomalous Neutron Yield In Indirect-drive Inertial-confineme...mentioning

confidence: 99%

Anomalous neutron yield in indirect-drive inertial-confinement-fusion due to the formation of collisionless shocks in the corona

Zhang

Cai

Shan³

et al. 2017

Nucl. Fusion

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“…As a consequence, the critical data including the x-ray fluxes and spectrums have good repeatability. Figure 3 shows the radiation temperatures measured by FXRD and simulated by LARED (a two-dimensional radiation hydrodynamic code [26]). The measured peak T r of Au hohlraums by detectors set at 20 • , 30 • and 45 • is 204 eV, 218 eV and 214 eV respectively, while that of UN-coated DUH is 207 eV, 220 eV and 218 eV correspondingly.…”

Section: Results and Analysismentioning

confidence: 99%

“…Results and analysis-Figure 3 shows the radiation temperatures (T r ) measured by FXRD and simulated by LARED (two dimensional radiation hydrodynamic code [23]). According to our previous measurements, the backscattered and near-backscattered energy is set as 8% of the total laser energy in the simulation.…”

mentioning

confidence: 99%

Uranium hohlraum with an ultrathin uranium–nitride coating layer for low hard x-ray emission and high radiation temperature

et al. 2015

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An ultrathin layer of uranium nitrides (UN) has been coated on the inner surface of depleted uranium hohlraum (DUH), which has been proven by our experiment to prevent the oxidization of uranium (U) effectively. Comparative experiments between the novel depleted uranium hohlraum and pure golden (Au) hohlraum are implemented on an SGIII-prototype laser facility. Under a laser intensity of 6 × 10 14 W cm −2 , we observe that the hard x-ray (hν 1.8 > keV) fraction of the uranium hohlraum decreases by 61% and the peak intensity of the total x-ray flux (0.1 keV∼5.0 keV) increases by 5%. Radiation hydrodynamic code LARED is used to interpret the above observations. Our result for the first time indicates the advantages of the UN-coated DUH in generating a uniform x-ray source with a quasi-Planckian spectrum, which should have important applications in high energy density physics.

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“…The simulation depends on the atomic model and the modelings of multiple physical processes, including electron thermal conduction, x-ray emission and radiation transport, nonlocal thermodynamic equilibrium kinetics, and hydrodynamic mixing at the interface, etc. In our previous research [17][18][19], we applied the classical average atom (AA) model in the code but acquired some inaccurate results. For example, the simulated bubble size and the electron temperature (T e ) within the bubble are obviously overestimated compared to the experimental results.…”

Section: Nuclear Fusionmentioning

confidence: 99%

Experimental and simulation studies on gold bubble movement in gas-filled hohlraums

Guo¹,

Li²,

Xie³

et al. 2018

Nucl. Fusion

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A recent experiment on the Shenguang III laser facility has applied open-end gold hohlraums with two gas pressures to study the movement of a plasma bubble. Under a laser intensity and width close to those of an ignition main pulse, the bubbles possess radial scales from several hundred to one thousand micrometers. An x-ray framing camera is used to measure the N-band x-ray images generated from the gold bubble plasma at different moments, from which the edge positions of the expanding bubbles are accurately acquired. The experimental results are simulated by an optimized two-dimensional radiation hydrodynamic code. Based on the classical average atom (AA) model, two phenomenological coefficients Cer and Cop are introduced into the code to correct the bubble evolution. Cer artificially redistributes the energies between radiation and matter, and Cop correlatively adjusts the plasma opacity. The bubble movement simulated by the novel phenomenological model agrees better with the measured result than that by the AA model. This work plays a critical role in our code improvements and advances the reliability of the hohlraum design.

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Numerical Simulation of 2-D Radiation-Drive Ignition Implosion Process

Cited by 32 publications

References 10 publications

Anomalous neutron yield in indirect-drive inertial-confinement-fusion due to the formation of collisionless shocks in the corona

Anomalous neutron yield in indirect-drive inertial-confinement-fusion due to the formation of collisionless shocks in the corona

Uranium hohlraum with an ultrathin uranium–nitride coating layer for low hard x-ray emission and high radiation temperature

Experimental and simulation studies on gold bubble movement in gas-filled hohlraums

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