Penetrating Radiography of Imploding and Stagnating Beryllium Liners on the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi></mml:math>Accelerator

McBride, R. D.; Slutz, Stephen A.; Jennings, Christopher; Sinars, Daniel Brian; Cuneo, M. E.; Herrmann, Mark; Lemke, R.W.; Martin, Matthew; Vesey, Roger Alan; Peterson, Kyle; Sefkow, A. B.; Nakhleh, Charles; Blue, B. E.; Killebrew, K. L.; Schroen, D. G.; Rogers, T. J.; Laspe, A. R.; López, M. R.; Smith, I. C.; Atherton, Briggs W.; Savage, M. E.; Stygar, W. A.; Porter, J. L.

doi:10.1103/physrevlett.109.135004

Cited by 108 publications

(41 citation statements)

References 18 publications

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“…7 (column 1), and previous randomly initialised Gorgon simulations in Cartesian geometry at 20 lm resolution (insufficient to resolve the ETI, similar to those presented in Ref. 7), as mentioned in Sec. I (column 2).…”

Section: Comparison To Experimentsmentioning

confidence: 76%

“…We show a comparison with the experimental results from Ref. 7, demonstrating improved agreement when the ETI, ECI, and material strength are included.…”

Section: Introductionmentioning

confidence: 99%

“…Implosions of hollow beryllium liners on the Z generator 5,6 at Sandia National Laboratories carried out by McBride et al 7,8 resulted in higher MRT amplitudes and wavelengths than those predicted by randomly initialised 3D MHD simulations, including the MHD code Gorgon, 9,10 indicating worse than expected performance in terms of confinement and robustness to liner-fuel mix. Code agreement was achieved only with the addition of an artificially azimuthally correlated initialisation.…”

Section: Introductionmentioning

confidence: 99%

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Instability growth for magnetized liner inertial fusion seeded by electro-thermal, electro-choric, and material strength effects

Pecover

Chittenden

2015

Physics of Plasmas

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A critical limitation of magnetically imploded systems such as magnetized liner inertial fusion (MagLIF) [Slutz et al., Phys. Plasmas 17, 056303 (2010)] is the magneto-Rayleigh-Taylor (MRT) instability which primarily disrupts the outer surface of the liner. MagLIF-relevant experiments have showed large amplitude multi-mode MRT instability growth growing from surface roughness [McBride et al., Phys. Rev. Lett. 109, 135004 (2012)], which is only reproduced by 3D simulations using our MHD code Gorgon when an artificially azimuthally correlated initialisation is added. We have shown that the missing azimuthal correlation could be provided by a combination of the electro-thermal instability (ETI) and an "electro-choric" instability (ECI); describing, respectively, the tendency of current to correlate azimuthally early in time due to temperature dependent Ohmic heating; and an amplification of the ETI driven by density dependent resistivity around vapourisation. We developed and implemented a material strength model in Gorgon to improve simulation of the solid phase of liner implosions which, when applied to simulations exhibiting the ETI and ECI, gave a significant increase in wavelength and amplitude. Full circumference simulations of the MRT instability provided a significant improvement on previous randomly initialised results and approached agreement with experiment. V C 2015 AIP Publishing LLC.

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Section: Comparison To Experimentsmentioning

confidence: 76%

“…We show a comparison with the experimental results from Ref. 7, demonstrating improved agreement when the ETI, ECI, and material strength are included.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Instability growth for magnetized liner inertial fusion seeded by electro-thermal, electro-choric, and material strength effects

Pecover

Chittenden

2015

Physics of Plasmas

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“…Most simulations of magnetically driven implosions including wires, 14 foils, 15 liners, 9 and Z-pinches, [16][17][18][19] etc. do not in general start with realistic initial conditions before current is applied and rather use assumptions of plasma conditions with empirically derived temperature or density perturbations at some time after the current has been initiated.…”

Section: Introductionmentioning

confidence: 99%

Simulations of electrothermal instability growth in solid aluminum rods

Peterson

Sinars

et al. 2013

Physics of Plasmas

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A recent publication [K. J. Peterson et al., Phys. Plasmas 19, 092701 (2012)] describes simulations and experiments of electrothermal instability growth on well characterized initially solid aluminum and copper rods driven with a 20 MA, 100 ns rise time current pulse on Sandia National Laboratories Z accelerator. Quantitative analysis of the high precision radiography data obtained in the experiments showed excellent agreement with simulations and demonstrated levels of instability growth in dense matter that could not be explained by magneto-Rayleigh-Taylor instabilities alone. This paper extends the previous one by examining the nature of the instability growth in 2D simulations in much greater detail. The initial instability growth in the simulations is shown via several considerations to be predominantly electrothermal in nature and provides a seed for subsequent magneto-Rayleigh-Taylor growth.

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“…Magnetically driven instabilities have attracted more and more attention from inertial confinement fusion (ICF) community due to its notoriety in pulsed power driven fusion, including Z-pinch dynamic hohlraum and magnetized liner inertial fusion (MagLIF) which has been a topic of increasing recent interest [1][2][3][4]. In wire array implosions axial nonuniformity of wire ablation results in plasmas colliding on the axis at a time that depends on axial position and a consequence decrease in implosion symmetry [5].…”

Section: Introductionmentioning

confidence: 99%

Role of electromagnetic wave in mode selection of magnetically driven instabilities

Dan¹,

Ren²,

Shuchao³

et al. 2014

AIP Conference Proceedings

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Abstract. The fundamental wavelength of the instability along two 25-m-diameter aluminum wires using a 100 ns rise time, 220 kA pulsed power facility is measured for two different load configurations. In one case the wires are perpendicular to end surface of electrodes, and in another case the wires are oblique to electrode's end surface. The primary diagnostic used to measure time revolution of instability wavelength and amplitude is laser shadowgraphy. The role of end surface of electrodes appears to be responsible for the differences in dominant wavelength of instability between two types of load configurations. The experimental results that the fundamental wavelength in oblique case is about one half of that in perpendicular case indicates the ionic electromagnetic waves may play a key role in mode selection of magnetically driven instabilities. Conclusions drew from this paper may help us to understand the original reason why instabilities along wires manifest itself as a quasiperiodic pattern.

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Penetrating Radiography of Imploding and Stagnating Beryllium Liners on theZAccelerator

Cited by 108 publications

References 18 publications

Instability growth for magnetized liner inertial fusion seeded by electro-thermal, electro-choric, and material strength effects

Instability growth for magnetized liner inertial fusion seeded by electro-thermal, electro-choric, and material strength effects

Simulations of electrothermal instability growth in solid aluminum rods

Role of electromagnetic wave in mode selection of magnetically driven instabilities

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