Evaluation of Transport Properties in Warm Dense Matter Generated by Pulsed-power Discharge for Nuclear Fusion Systems

Sasaki, Toru; Takahashi, Takuya; Ohuchi, Takumi; Kawaguchi, Yoshimasa; Takahashi, Keníchi; Kikuchi, Takashi; Aso, T.; Harada, Naomi; Horioka, Kazuhiko; Nagatomo, Hideo; Fujioka, Shinsuke

doi:10.1016/j.egypro.2014.11.878

Cited by 4 publications

(1 citation statement)

References 34 publications

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“…Understanding WDM is essential for enhancing our knowledge about astrophysical objects, such as the physics in Earth's core [7], the formation processes of both planets in our solar system [8][9][10][11][12][13][14] and of exoplanets [15,16], in brown dwarfs [17,18], and stellar interiors [19]. From a technological point of view, warm dense conditions arise in the heating process of inertial confinement fusion capsules on their path towards ignition [20,21] and in the walls of high-power magnetic fusion devices [22]. Since both thermal and quantum effects have to be taken into account [23], the quality of well-established methods of plasma physics or of condensed-matter physics might be insufficient.…”

Section: Introductionmentioning

confidence: 99%

First-principles modeling of plasmons in aluminum under ambient and extreme conditions

Ramakrishna,

Cangi,

Dornheim

et al. 2020

Preprint

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The numerical modeling of plasmon behavior is crucial for an accurate interpretation of inelastic scattering diagnostics in many experiments. We highlight the utility of linear-response timedependent density functional theory (LR-TDDFT) as an appropriate first-principles framework for a consistent modeling of plasmon properties. We provide a comprehensive analysis of plasmons from ambient throughout warm dense conditions and assess typical properties such as the dynamical structure factor, the plasmon dispersion, and the plasmon width. We compare them with experimental measurements in aluminum accessible via x-ray Thomson scattering and with other dielectric models such as the Lindhard model, the Mermin approach based on parametrized collision frequencies, and the dielectric function obtained using static local field corrections of the uniform electron gas parametrized from path integral Monte Carlo simulations both at the ground state and at finite temperature. We conclude with the remark that the common practice of extracting and employing plasmon dispersion relations and widths is an insufficient procedure to capture the complicated physics contained in the dynamic structure factor in its full breadth.

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Section: Introductionmentioning

confidence: 99%

First-principles modeling of plasmons in aluminum under ambient and extreme conditions

Ramakrishna,

Cangi,

Dornheim

et al. 2020

Preprint

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Efficient target acceleration using underwater electrical explosion of wire array

Maler

Rososhek

Efimov

et al. 2021

Journal of Applied Physics

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The results of experimental studies together with numerical and analytical modeling showed that the acceleration of a target by employing the shock compression and water flow generated by the underwater electrical explosion of a wire array can be considered an efficient (up to ∼20%) approach. In experiments, a pulse generator with stored energy of ∼6.5 kJ, current amplitude of ∼380 kA, and rise time of ∼1.2 μs was used for underwater electrical explosion of a copper wire planar array. Streak shadow imaging and photonic Doppler velocimetry were applied to study the time-resolved velocity of the shock in water and an aluminum target in air, respectively. The targets, having different thicknesses and designs, were positioned at variable distances from the array. Experimental results showed that the target velocity evolution is characterized by an ns-timescale rise time peak with a subsequent decrease, which transfers to a μs-timescale increase up to its saturated value. Target velocities of up to 1360m/s were measured. The experimental, numerical, and analytical modeling results showed that a temporally unmovable barrier, located between the exploding array and the target, allows one to increase the pressure in that location, which leads to higher shock velocity in the target.

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Target acceleration by sub-microsecond underwater electrical explosions of wire arrays

Maler

Efimov

Krasik

2022

Journal of Applied Physics

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Experiments of a target accelerated by the shockwaves and water flow generated by underwater sub-μs timescale electrical explosion of a planar wire array are presented. The results of this experiment are compared with previous results [Maler et al., J. Appl. Phys. 129, 034901 (2021)] in which efficient target acceleration by μs-timescale underwater explosions of planar wire arrays was obtained. Although less energy is deposited into the wire array in the present experiments, the target acquires similar and even higher velocities compared to the previous research. This is considered to be associated with the higher energy density deposition rate, inducing faster radial wire expansion, and, consequently, the generation of a stronger shockwave and faster water flow behind its front.

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Evaluation of Transport Properties in Warm Dense Matter Generated by Pulsed-power Discharge for Nuclear Fusion Systems

Cited by 4 publications

References 34 publications

First-principles modeling of plasmons in aluminum under ambient and extreme conditions

First-principles modeling of plasmons in aluminum under ambient and extreme conditions

Efficient target acceleration using underwater electrical explosion of wire array

Target acceleration by sub-microsecond underwater electrical explosions of wire arrays

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