Direct measurement of the inertial confinement time in a magnetically driven implosion

Knapp, Patrick; Martin, Matthew; Dolan, Daniel H.; Cochrane, Kyle; Dalton, D. G.; Davis, JP; Jennings, Christopher; Loisel, Guillaume; Romero, D.; Smith, I. C.; Yu, Edmund; Weis, Matthew; Mattsson, Thomas R.; McBride, R. D.; Peterson, Kyle; Schwarz, Jens; Sinars, Daniel Brian

doi:10.1063/1.4981206

Cited by 27 publications

(5 citation statements)

References 21 publications

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“…Another related fundamental question concerns the effect of MRT on fuel assembly and confinement. Radiographic experiments enabling direct measurements of the inertial confinement time, τ , and pressure-time product, Pτ , demonstrated that areal density variations due to MRT can decrease both the inertial confinement time and attainable fuel pressures [88]. Furthermore, MRT weakens confinement in the bubble regions via mass transport to the spikes, creating regions susceptible to 'aneurysms' that can lead to rapid pressure loss of the fuel [88,89].…”

Section: Instability Developmentmentioning

confidence: 99%

“…Radiographic experiments enabling direct measurements of the inertial confinement time, τ , and pressure-time product, Pτ , demonstrated that areal density variations due to MRT can decrease both the inertial confinement time and attainable fuel pressures [88]. Furthermore, MRT weakens confinement in the bubble regions via mass transport to the spikes, creating regions susceptible to 'aneurysms' that can lead to rapid pressure loss of the fuel [88,89]. Figure 11 shows radiographic images capturing the development of an aneurysm in a beryllium liner confining a high-pressure deuterium fuel.…”

Section: Instability Developmentmentioning

confidence: 99%

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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%

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 fast (100-ns) imploding liner-fuel system can then be considered an inertial confinement fusion (ICF) "target." Imploding a metal liner containing fuel is the technique employed by the magnetized liner inertial fusion (MagLIF) concept [7], [8] presently being investigated numerically [7], [8], [41]- [44] and experimentally [9], [10], [45]- [52] using the Z facility at Sandia. As described by Eq.…”

Section: A Simple Picture Of a Pulsed-power-driven Hedp Experimentsmentioning

confidence: 99%

A Primer on Pulsed Power and Linear Transformer Drivers for High Energy Density Physics Applications

McBride

Stygar

Cuneo

et al. 2018

IEEE Trans. Plasma Sci.

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“…In the ICF, the disturbance at the hotspot-fuel interface originates from its initial perturbation, the feedthrough of the perturbation on the ablation surface and the driven inhomogeneity (Hsing & Hoffman 1997;Weir, Chandler & Goodwin 1998;Shigemori et al 2002;Regan et al 2004;Haan et al 2011;Simakov et al 2014;Knapp et al 2017;Desjardins et al 2019). Milovich et al (2004) showed that the feedthrough of the ablation surface leads to a significant decrease in the implosion efficiency of a double-shell ignition target.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic instabilities of two successive slow/fast interfaces induced by a weak shock

Luo

2023

J. Fluid Mech.

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Shock-induced instability developments of two successive interfaces have attracted much attention, but remain a difficult problem to solve. The feedthrough and reverberating waves between two successive interfaces significantly influence the hydrodynamic instabilities of the two interfaces. The evolutions of two successive slow/fast interfaces driven by a weak shock wave are examined experimentally and numerically. First, a general one-dimensional theory is established to describe the movements of the two interfaces by studying the rarefaction waves reflected between the two interfaces. Second, an analytical, linear model is established by considering the arbitrary wavenumber and phase combinations and compressibility to quantify the feedthrough effect on the Richtmyer–Meshkov instability (RMI) of two successive slow/fast interfaces. The feedthrough significantly influences the RMI of the two interfaces, and even leads to abnormal RMI (i.e. phase reversal of a shocked slow/fast interface is inhibited) which is the first observational evidence of the abnormal RMI provided by the present study. Moreover, the stretching effect and short-time Rayleigh–Taylor instability or Rayleigh–Taylor stabilisation imposed by the rarefaction waves on the two interfaces are quantified considering the two interfaces’ phase reversal. The conditions and outcomes of the freeze-out and abnormal RMI caused by the feedthrough are summarised based on the theoretical model and numerical simulation. A specific requirement for the simultaneously freeze-out of the instability of the two interfaces is proposed, which can potentially be used in the applications to suppress the hydrodynamic instabilities.

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Direct measurement of the inertial confinement time in a magnetically driven implosion

Cited by 27 publications

References 21 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 Primer on Pulsed Power and Linear Transformer Drivers for High Energy Density Physics Applications

Hydrodynamic instabilities of two successive slow/fast interfaces induced by a weak shock

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