The effect of external magnetic field on the linear stage evolution of Kelvin–Helmholtz instability in laser driven plasma

Sun, W.; Zhong, Jiayong; Zhang, S.; Tong, Bowei; Wang, L.F.; Zhao, Kai; Liu, J.Y.; Han, Bo; Zhu, Baojun; Yuan, Ding; Yuan, Xunhui; Zhang, Z.; Li, Y.T.; Zhang, Qiang; Peng, Junyi; Wang, J.Z.; Ping, Yongli; Xing, Chunqing; Wei, Huigang; Liang, G. Y.; Xie, Zhiyong; Wang, C.; Zhao, Guijuan; Zhang, J.

doi:10.1016/j.hedp.2019.02.003

Cited by 6 publications

(4 citation statements)

References 24 publications

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“…If we consider the effect of the total thick-ness and magnetic field together under specific experimental conditions, a more obvious suppression result of KHI may be obtained. These conclusions may provide a theoretical reference to the experimental results of a KHI produced by intense laser-driven thin plastic foils with external magnetic field [19] and to the suppression of KHI in the thin film layer (coating) in Zhang's [18] double-cone ignition scheme. Finally, we compare the analytic linear growth rates with numerical results, and they agree well with each other.…”

Section: Discussionmentioning

confidence: 62%

“…Our theoretical model can also be applied to related experiments on the effect of magnetic field on the linear growth of KHI in laser driven plasmas. Sun et al [19] have presented the experimental results of a KHI produced by intense laserdriven thin plastic foils with external magnetic field. The relevant parameters in the article are k ∼ 4π µm −1 , ρ 1 ∼ ρ 2 ∼ 10 19 cm −3 , U 1 ∼ 138.2 km/s, U 2 ∼ 0, B 0 ∼ 1424 Gs (1 Gs = 10 −4 T) and the thickness of the plastic foil is 10 µm.…”

Section: Extended Applicationsmentioning

confidence: 99%

See 1 more Smart Citation

Magnetohydrodynamic Kelvin–Helmholtz instability for finite-thickness fluid layers

Dai¹,

Xu²,

Guo³

et al. 2022

Chinese Phys. B

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We have derived the analytical formulas for the Kelvin–Helmholtz instability (KHI) of two superposed finite-thickness fluid layers with the magnetic field effect into consideration. The linear growth rate of KHI will be reduced when the thickness of the fluid with large density is decreased or the thickness of fluid with small density is increased. When the thickness and the magnetic field act together on the KHI, the effect of thickness is more obvious when the magnetic field intensity is weak. The magnetic field transition layer destabilizes (enforces) the KHI, especially in the case of small thickness of the magnetic field transition layer. When considering the effect of magnetic field, the linear growth rate of KHI always decreases after reaching the maximum with the increase of total thickness. The stronger the magnetic field intensity is, the more obvious the growth rate decreases with the total thickness. Thus, it should be included in applications where the effect of fluid thickness on the KHI can not be ignored, such as in double-cone ignition scheme for inertial confinement fusion.

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Section: Discussionmentioning

confidence: 62%

Section: Extended Applicationsmentioning

confidence: 99%

Magnetohydrodynamic Kelvin–Helmholtz instability for finite-thickness fluid layers

Dai¹,

Xu²,

Guo³

et al. 2022

Chinese Phys. B

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“…This phenomenon can be characterized by comparing the values of the dimensionless parameter Alfvén number R A (R A = u/v A ) (where u is the average velocity of interface instability and v A is the Alfvén velocity) [23,35,36]. When R A < 1, the Lorentz force acting on the fluid will firmly stabilize the interface instability [37][38][39]. Otherwise, if R A ⩾ 1, the external magnetic field will not inhibit the development of the interface instability.…”

Section: Numerical Simulation Modelmentioning

confidence: 99%

Modeling simulation on amplifying magnetic fields in supernova remnants with an intense laser

Sun

Lei

et al. 2023

New J. Phys.

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Local magnetic field enhancement in supernova remnants (SNRs) is a natural laboratory for studying the amplification effect of turbulent magnetic fields. In recent years, high-power laser devices have gradually matured as a tool for astronomical research that perfects observations and theoretical models. In this study, a model of the amplification effect of the turbulent magnetic field in SNRs by an intense laser is simulated using the radiation magnetohydrodynamic simulation program. We investigate and compare the evolutionary processes of unstable turbulence under different initial disturbance modes, directions, and intensities of external magnetic fields and obtain the magnetic energy spectrum and magnetic field magnification. The results demonstrate that the fluid motion associated with Rayleigh-Taylor instability (RTI) will stretch the environmental magnetic field significantly, with an intensity amplified by two orders of magnitude. The environmental magnetic field perpendicular to the laser injection direction is decisive during magnetic field amplification which is necessary to clarify the physical mechanism of magnetic field amplification in SNRs. Furthermore, it will deepen the understanding of the interstellar magnetic field’s evolution. The results also establish a reference for laser-driven magnetized plasma experiments in a robust magnetic environment.

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“…Several authors [3 -5] revealed that highentropy alloys (HEAs) synthesized in selective electronbeam melting are characterized by high mechanical properties, which are possible due to the formation of micro-and nanodimensional structures and phases. One of the most probable mechanisms responsible for their forming is thought to be various hydrodynamic instabilities, e. g. the Mullins-Sekerka instability [6], thermocapillary instability [7,8] and the Kelvin-Helmholtz instability [9,10]. An assumption was made [11,12] that micro-and nanostructure phase states develop in multicomponent alloys owing to the evolving combination of thermal, concentration-evaporation and thermoelectric instabilities.…”

Section: Introductionmentioning

confidence: 99%

The mechanism of formation of surface micro- and nanostructures in the AlCoCrFeNi high-entropy alloy during electron-beam treatment

et al. 2021

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The paper is devoted to a study of the formation of submicron and nanosized cellular crystallization structures on the surface of a high-entropy AlCoCrFeNi alloy irradiated by high current electron beams with the energy density varying from 10 to 30 J / cm 2 and a pulse time of 200 μs. The study revealed that the combination of thermal, evaporation-capillary and thermoelectric instabilities induces the formation of submicro-and nanodimensional cellular structures similarly to high-entropy alloys. The proposed dispersion equation was analyzed to detect the conditions for the generation of this instability. The importance of the evaporation process was investigated by finding a solution to the heat problem with phase transformations. The temperature distribution over time calculated at different distances from the surface of the alloy samples demonstrated that the surface temperature is lower than the evaporation temperature for the energy density E s < 30 J / cm 2 , therefore, the term of evaporation in the dispersion equation was ignored for these values of the energy density. The analysis of the dispersion equation showed that for E s = 30 J / cm 2 , the wavelength λ m with the maximal growth rate of perturbations on the melt surface gains a value in the submicro-and nano-range, provided that the thermoelectric coefficient equals to ~4 -10 V / K, and the pressure of evaporation is ~10 5 Pa. If we exclude thermoelectric effects, these values λ m are observed for the pressure of evaporation ~10 11 Pa. The wavelength λ m was revealed to decrease according to a power law as the beam energy density increases.

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The effect of external magnetic field on the linear stage evolution of Kelvin–Helmholtz instability in laser driven plasma

Cited by 6 publications

References 24 publications

Magnetohydrodynamic Kelvin–Helmholtz instability for finite-thickness fluid layers

Magnetohydrodynamic Kelvin–Helmholtz instability for finite-thickness fluid layers

Modeling simulation on amplifying magnetic fields in supernova remnants with an intense laser

The mechanism of formation of surface micro- and nanostructures in the AlCoCrFeNi high-entropy alloy during electron-beam treatment

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