High-energy-density plasma jet generated by laser-cone interaction

Ke, Y.; Yang, X. H.; Y., Y.; Xu, Binbin; Ge, Z. Y.; Gan, Long-Fei; Li, Meng; Wang, S. W.; Kawata, S.

doi:10.1063/1.5021137

Cited by 3 publications

(2 citation statements)

References 36 publications

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“…Although the hotspot-like plasma becomes larger along the R-axis, the neutron yield would decrease. As shown in Figure 8A, the maximum yield is 12.3 × 10 8 in the case of θ 70 °, corresponding to the optimized angle for energy a point conversion efficiency and jet formation in our previous work [30]. Additionally, the neutron source with an overlarge R-size cannot be seen as, perhaps reducing the diagnosis resolution.…”

Section: Figurementioning

confidence: 66%

“…The uniquely converging configuration contributes to generating plasma jets with wide parameter range, which is considered an alternative tool to study astrophysical jets [28,29]. Based on our previous work about high energy density jets, we propose a scheme of the compact source from the collision of high energy density jets [30]. When a laser beam irradiates the hollow cone which is made of deuterated polystyrene, high energy density plasma jets driven by ablation pressure are produced.…”

Section: Introductionmentioning

confidence: 99%

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Compact neutron source from head-on collision of high energy density plasma jets

Cui

Ke²,

Yang³

et al. 2022

Front. Phys.

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We propose a new scheme to generate a neutron source with a short duration, and the scheme is validated in two-dimensional radiation hydrodynamic simulations. When a laser beam irradiates a deuterated polystyrene cone with a half-opening angle of 60°, high energy density plasma jets are produced due to the converging effect. As two laser-driven counter-propagating jets collide in a head-on configuration, the kinetic energy converts into internal energy efficiently, inducing a significant increase in density and temperature. Then, deuteron–deuteron thermonuclear reactions are triggered, and plenty of neutrons are released. The simulation results show that the total neutron yield is as high as 6.6×108 with a duration of 103 ps, providing a new way to achieve ultrafast diagnosis with high resolution in experiments.

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Section: Figurementioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Compact neutron source from head-on collision of high energy density plasma jets

Cui

Ke²,

Yang³

et al. 2022

Front. Phys.

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Observation of hydrodynamic phenomena of plasma interaction in hohlraums

Li¹,

Yang²,

Li³

et al. 2018

Acta Phys. Sin.

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In indirect-drive inertial confinement fusion (ICF), laser beams are injected into a high-Z hohlraum and the laser energy is converted into intense X-ray radiation, which ablates a capsule located in the center of the hohlraum, and thus making it implode. To achieve high implosion efficiency, it is required that the hohlraum inner wall plasma movement, which will block further laser injection through the laser entrance hole (LEH), be suppressed. Evolution of hohlraum radiation nonuniformity caused by the plasma movement will result in implosion asymmetry which will prevent the ignition from happening. Therefore it is very important to study the hydrodynamic movement of high-Z plasma in ICF experiment. In ICF hohlraum, various plasmas of laser spots, corona, radiation ablation and jets move in different ways driven by laser ablation and X-ray radiation ablation, which is hard to observe and study. An X-ray dual spectral band time-resolved imaging method is developed to clearly observe the motion of various plasmas in hohlraum. Based on the time-resolved X-ray framing camera, using the typical gold plasma emission spectrum, the gold microstrip MCP response spectrum, and the 1.5 μm Al or 3 μm Ti filter transmittance spectrum, the two narrow-band X-ray peaks at 0.8 keV and 2.5 keV are highlighted. The 0.8 keV X-ray shows the Planck spectrum of gold plasma, and 2.5 keV X-ray indicates the M-band of gold plasma. In the vacuum hohlraum, jets are observed clearly, which are verified to be 4 times the sound speed experimentally. The generation mechanism of gold plasma jets in the ICF hohlraum is mainly due to collision rather than magnetic field, because it is estimated that thermal pressure is much bigger than magnetic pressure. In the gas-filled hohlraum, low-Z C5H12 gas can effectively eliminate high-Z gold jets and suppress the high-Z gold coronal plasma movement. The interface between the low-Z and high-Z substance is observed clearly, and gold plasma is accumulated obviously in the later period at the interface. Moreover, spike and filamentous structure occur at the interface between the two substances, which is probably caused by the hydrodynamic instability. The 0.8 keV rather than 2.5 keV X-ray is observed around inner wall, which originates from the low-temperature plasma driven by radiation ablation and is predicted by simulation code. Furthermore, the pressure balance between the two substances and the density steepness at the interface are also analyzed.

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Two-dimensional radiation hydrodynamic simulations of high-speed head-on collisions between high-density plasma jets

Yang¹,

Wu²,

Chen³

et al. 2022

Acta Phys. Sin.

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Collisions of plasma jets are common hydrodynamic phenomena in astrophysical and laser-plasma interaction processes. Deriving scaling relationships between colliding plasmas and initial conditions of plasma jets is of great significance for the optimization design and data analysis of the relevant experiments. Double-Cone Ignition (DCI) scheme is an excellent platform for the study of plasma jets collision, since the collision of high-speed, high-density plasma jets can be easily generated and characterized in both simulations and experiments. In this paper, we employ the upgraded two-dimensional arbitrary Eulerian-Lagrange (ALE) program MULTI-2D to simulate collision process of plasma jets with high speed (≥ 100 km/s) and high density (≥ 10 g/cc). Using the database obtained from the simulations, hydrodynamic scaling laws that describing the collision process of plasma jets are derived with the Bayesian inference method in machine learning. The Bayesian inference method not only has the parameter estimation function of traditional least square method, but also has other potential advantages such as giving the probability distribution of estimated parameters. Numerical results show that the collision of plasma jets with open boundaries is easy to form an isochoric plasma distribution with high-density. Increasing the initial density and velocity of the plasma jets is helpful to enhance the density and temperature of the colliding plasmas. Increasing the initial temperature of plasma jets is beneficial to achieve colliding plasmas with a higher temperature, while leading to a decreased plasma density and pressure after collision. When the initial density, temperature and velocity of the plasma jets are set to be 15 g/cc, 30 eV and 300 km/s, respectively, the colliding plasma density can reach more than 300 g/cc. This is very favorable for the following fast electron heating process in the double-cone ignition (DCI) scheme. The issue about quantum degeneracy after collision is discussed in this work. Under the typical initial conditions of plasma jets in DCI scheme (100km/s ≤V0≤500km/s, 10eV ≤T0≤ 100eV, 10g/cc ≤ρ0≤ 50g/cc, both quantum degenerate plasma and classical non-degenerate plasma can be obtained with the temperature between 0.3TF (Fermi temperature) and 3TF. By comparing the plasma temperature and Fermi temperature of the collision, the criterion for achieving quantum degenerate plasma or non-degenerate plasma under given initial conditions is obtained with the help of the derived hydrodynamic scaling laws. The criterion shows that higher initial velocity, higher temperature and lower density of plasma jets are required if we want to obtain non-degenerate plasma after collision.

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High-energy-density plasma jet generated by laser-cone interaction

Cited by 3 publications

References 36 publications

Compact neutron source from head-on collision of high energy density plasma jets

Compact neutron source from head-on collision of high energy density plasma jets

Observation of hydrodynamic phenomena of plasma interaction in hohlraums

Two-dimensional radiation hydrodynamic simulations of high-speed head-on collisions between high-density plasma jets

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