Radiating Shock Properties in the Z-pinch Dynamic Hohlraum

Rochau, Gregory A.; Bailey, James E.; Maron, Y.; Chandler, G. A.; Fisher, V.; Lemke, R.; Macfarlane, J. J.; Peterson, Kyle; Slutz, Stephen A.; Stambulchik, E.

doi:10.1063/1.3241206

Cited by 5 publications

(6 citation statements)

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“…This current pulse is applied to various loads to generate magnetic drive pressures on the order of 100's Mbar. The various loads investigated enable research efforts in inertial confinement fusion (ICF) [7], [10], [90]- [92], pulsed-power physics [27], z-pinch physics [93], [94], radiation effects [15], radiation physics [13], [14], laboratory astrophysics [95], dynamic material properties [96]- [98], and other high-energy-density physics (HEDP) applications [90], [99]. The Z accelerator is also very efficient, coupling upwards of 15% of its stored ≈ 20 MJ of electrical energy to well-matched loads-i.e., delivering roughly 1-3 MJ to well matched loads.…”

Section: A Brief Review Of the Z Pulsed-power Facilitymentioning

confidence: 99%

“…These facilities support a variety of programs in stockpile stewardship and basic science. For example, the pulsed-power facilities at Sandia presently support stockpile stewardship experiments in inertial confinement fusion (ICF) [7]- [10], material properties [11], [12], radiation physics [13], [14], radiation effects testing [15], [16], and advanced radiography development [17], [18] as well as basic science programs in material properties [19], radiation physics [20], planetary science [21], and laboratory astrophysics [22].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: A Brief Review Of the Z Pulsed-power Facilitymentioning

confidence: 99%

Section: Introductionmentioning

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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“…Another hypothetical concept that exploits the ability of coiled wires to control the precise location at which implosion occurs involves modifying the wire-array driven dynamic hohlraum [21], [22] for use with a coiled array. Fig.…”

Section: Possible Application Of Coiled Arrays To Icf Conceptsmentioning

confidence: 99%

Modifying Wire-Array Z-Pinch Ablation Structure and Implosion Dynamics Using Coiled Wires

Hall

Bland

Лебедев

et al. 2009

IEEE Trans. Plasma Sci.

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Coiled arrays, which are cylindrical arrays in which each wire is formed into a helix, suppress the modulation of ablation at the fundamental wavelength. Outside the vicinity of the wire cores, ablation flow from coiled arrays is modulated at the coil wavelength and has a two-stream structure in the r, θ plane. Within the vicinity of the helical wires, ablation is concentrated at positions with the greatest azimuthal displacement, and plasma is axially transported from these positions such that the streams become aligned with the sections of the coil furthest from the array axis. The GORGON MHD code accurately reproduces this observed ablation structure, which can be understood in terms of J × B forces that result from the interaction of the global magnetic field with a helical current path as well as additional current paths suggested by the simulations. With this ability to control where the ablation streamers occur, large wavelength coils were constructed such that the breaks that form in the wires had sufficient axial separation to prevent perturbations in the implosion sheath from merging. This produced a new mode of implosion in which the global instability can be controlled, and perturbations correlated between all wires in an array. For large-wavelength eight-wire coiled arrays, this produced a dramatic increase in X-ray power, equaling that of a 32-wire straight array. These experiments were carried out on the mega ampere generator for plasma implosion experiments (1 MA, 240 ns) at Imperial College London, London, U.K.

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“…Polymer foam is a crucial part of the dynamic hohlraum platform used to generate intense x-ray radiation at Sandia's Z-machine [11][12][13] and designs for Inertial Confined Fusion (ICF) often involve foams. As experimental designs are being refined -primarily as a result of an interplay between radiation-hydrodynamics modeling, improved diagnostics, and improved drivers -the importance of having accurate material models based on a fundamental understanding of the material's behavior is becoming increasingly clear.…”

Section: Introductionmentioning

confidence: 99%

Modeling ramp compression experiments using large-scale molecular dynamics simulation.

Mattsson¹,

Desjarlais²,

Grest³

et al. 2011

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Molecular dynamics simulation (MD) is an invaluable tool for studying problems sensitive to atomscale physics such as structural transitions, discontinuous interfaces, non-equilibrium dynamics, and elastic-plastic deformation. In order to apply this method to modeling of ramp-compression experiments, several challenges must be overcome: accuracy of interatomic potentials, length-and time-scales, and extraction of continuum quantities. We have completed a 3 year LDRD project with the goal of developing molecular dynamics simulation capabilities for modeling the response of materials to ramp compression. The techniques we have developed fall in to three categories (i) molecular dynamics methods (ii) interatomic potentials (iii) calculation of continuum variables. Highlights include the development of an accurate interatomic potential describing shock-melting of Beryllium, a scaling technique for modeling slow ramp compression experiments using fast ramp MD simulations, and a technique for extracting plastic strain from MD simulations. All of these methods have been implemented in Sandia's LAMMPS MD code, ensuring their widespread availability to dynamic materials research at Sandia and elsewhere.3

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Radiating Shock Properties in the Z-pinch Dynamic Hohlraum

Cited by 5 publications

References 0 publications

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

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

Modifying Wire-Array Z-Pinch Ablation Structure and Implosion Dynamics Using Coiled Wires

Modeling ramp compression experiments using large-scale molecular dynamics simulation.

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