The Electrothermal Instability on Pulsed Power Ablations of Thin Foils

Steiner, Adam; Campbell, P. C.; Yager-Elorriaga, D. A.; Jordan, Nicholas M.; McBride, R. D.; Lau, Y. Y.; Gilgenbach, R. M.

doi:10.1109/tps.2018.2873947

Cited by 14 publications

(3 citation statements)

References 60 publications

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“…Recent work has suggested that the higher-than-expected azimuthal correlation could be related to key missing physics in the seeding of the MRT instability. Presently, it is proposed that the early time electrothermal instability (ETI) [65][66][67][68][69][70][71][72][73][74][75] could explain the azimuthal correlation, even with axiallyfinished targets. This instability arises due to localized current enhancement in materials where the resistivity increases with temperature and/or decreases with density.…”

Section: Instability Developmentmentioning

confidence: 99%

An overview of magneto-inertial fusion on the Z machine at Sandia National Laboratories

et al. 2022

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We present an overview of the magneto-inertial fusion (MIF) concept Magnetized Liner Inertial Fusion (MagLIF) pursued at Sandia National Laboratories and review some of the most prominent results since the initial experiments in 2013. In MagLIF, a centimeter-scale beryllium tube or ‘liner’ is filled with a fusion fuel, axially pre-magnetized, laser pre-heated, and finally imploded using up to 20 MA from the Z machine. All of these elements are necessary to generate a thermonuclear plasma: laser preheating raises the initial temperature of the fuel, the electrical current implodes the liner and quasi-adiabatically compresses the fuel via the Lorentz force, and the axial magnetic field limits thermal conduction from the hot plasma to the cold liner walls during the implosion. MagLIF is the first MIF concept to demonstrate fusion relevant temperatures, significant fusion production (>1013 primary DD neutron yield), and magnetic trapping of charged fusion particles. On a 60 MA next-generation pulsed-power machine, two-dimensional simulations suggest that MagLIF has the potential to generate multi-MJ yields with significant self-heating, a long-term goal of the US Stockpile Stewardship Program. At currents exceeding 65 MA, the high gains required for fusion energy could be achievable.

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Section: Instability Developmentmentioning

confidence: 99%

An overview of magneto-inertial fusion on the Z machine at Sandia National Laboratories

et al. 2022

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“…The experimental facility assembled at UM to test the Laser Gate concept included a small current pulser, 17,18 an iPhone 6s video camera, and a 12-frame brightfield laser schlieren/shadowgraphy imaging system (see Fig. 5).…”

Section: Experimental Test Facilitymentioning

confidence: 99%

A pulsed-power implementation of “Laser Gate” for increasing laser energy coupling and fusion yield in magnetized liner inertial fusion (MagLIF)

Miller

Slutz

Bland

et al. 2020

Review of Scientific Instruments

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Magnetized Liner Inertial Fusion (MagLIF) at Sandia National Laboratories involves a laser preheating stage, where a few-ns laser pulse passes through a few-micron-thick plastic window to preheat gaseous fusion fuel contained within the MagLIF target. Interactions with this window reduce heating efficiency and mix window and target materials into the fuel. A recently proposed idea called "Laser Gate" involves removing the window well before the preheating laser is applied. In this article, we present experimental proof-of-principle results for a pulsed-power implementation of Laser Gate, where a thin current-carrying wire weakens the perimeter of the window, allowing the fuel pressure to push the window open and away from the preheating laser path. For this effort, transparent targets were fabricated and a test facility capable of studying this version of Laser Gate was developed. A 12-frame bright-field laser schlieren/shadowgraphy imaging system captured the window opening dynamics on microsecond timescales. The images reveal that the window remains largely intact as it opens and detaches from the target. A column of escaping pressurized gas appears to prevent the detached window from inadvertently moving into the preheating laser path.

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“…In the past a number of publications reported that loads made of flat or cylindrical foils, composed of different materials and different sizes, were exploded with pulse high-current generators for the purpose of various applications [1][2][3][4][5][6][7][8][9][10][11][12]. Under the 1000 Å), as well as soft x-ray (SXR) radiation (2 Å < λ < 100 Å) [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Study of SXR/EUV radiation of exploded foils and wires with spectral, spatial and temporal resolution simultaneously on KING electric discharge facility.

Pikuz¹,

Shelkovenko²,

Tilikin³

et al. 2021

Plasma Sources Sci. Technol.

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The results of studies of the soft x-ray and extreme ultraviolet (SXR/EUV) radiation of thin flat aluminum foils and wires under the explosion in an electric discharge on the compact high-current KING generator are presented. These studies were based on the SXR/EUV spectroscopy with a spectral resolution of 6 Å, a temporal resolution of 5 ns and a spatial resolution of 200 μm. To study the plasma radiation of exploded foils and wires in the SXR/EUV range, we used a transmission diffraction grating spectrograph which in combination with two additional slits provided spectral and spatial resolution. The spectrograph was coupled with a four-frame recorder based on a microchannel plate for providing temporal resolution. The analysis and comparison of the spectral, spatial, temporal, and energy characteristics of the SXR/EUV radiation of plasma formed under the explosion of foils and wires of a similar mass made of aluminum was carried out. The spectra were calculated as well and the plasma parameters and their changes in time and space were estimated on the basis of these calculations and comparison with relevant experimental results. Experiments have shown that when foils explode, a single intense source of SXR/EUV radiation is formed with radiated energy in the range of 10-20 J and a power of up to 100 MW in the quantum energy range from 30 to 250 eV. At the same time, the radiation power under the explosion of foils turned out to be about twice above the power under the explosion of wires of comparable mass.

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The Electrothermal Instability on Pulsed Power Ablations of Thin Foils

Cited by 14 publications

References 60 publications

An overview of magneto-inertial fusion on the Z machine at Sandia National Laboratories

An overview of magneto-inertial fusion on the Z machine at Sandia National Laboratories

A pulsed-power implementation of “Laser Gate” for increasing laser energy coupling and fusion yield in magnetized liner inertial fusion (MagLIF)

Study of SXR/EUV radiation of exploded foils and wires with spectral, spatial and temporal resolution simultaneously on KING electric discharge facility.

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