Instability growth in magnetically imploded high-conductivity cylindrical liners with material strength

Reinovsky, R.E.; Anderson, William E.; Atchison, W.L.; Ekdahl, Carl; Faehl, R.J.; Lindemuth, I.R.; Морган, Д.; Murillo, Michael S.; Stokes, John; Shlachter, J.S.

doi:10.1109/tps.2002.805418

Cited by 64 publications

(24 citation statements)

References 12 publications

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“…The remaining published controlled studies of MRT growth were PHYSICS OF PLASMAS 18, 056301 (2011) done on multimicrosecond generators in which the imploding liners have significant material strength and remain in liquid or solid states for much of the implosion. 12 By contrast, in fast ($100 ns) implosions strong shocks can develop in the liner and the liner is typically in the plasma state for much of the implosion. Due to the lack of high-quality data for the submicrosecond regime, the magnetohydrodynamics physics packages of simulation codes (e.g., LASNEX, 13 HYDRA, 14 GORGON 15 ) are not well validated.…”

Section: Introductionmentioning

confidence: 99%

Measurements of magneto-Rayleigh–Taylor instability growth during the implosion of initially solid metal liners

et al. 2011

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A recent publication [D. B. Sinars et al., Phys. Rev. Lett. 105, 185001 (2010)] describes the first controlled experiments measuring the growth of the magneto-Rayleigh–Taylor instability in fast (∼100 ns) Z-pinch plasmas formed from initially solid aluminum tubes (liners). Sinusoidal perturbations on the surface of these liners with wavelengths of 25–400 μm were used to seed single-mode instabilities. The evolution of the outer liner surface was captured using multiframe 6.151 keV radiography. The initial paper shows that there is good agreement between the data and 2-D radiation magneto-hydrodynamic simulations down to 50 μm wavelengths. This paper extends the previous one by providing more detailed radiography images, detailed target characterization data, a more accurate comparison to analytic models for the amplitude growth, the first data from a beryllium liner, and comparisons between the data and 3D simulations.

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Section: Introductionmentioning

confidence: 99%

Measurements of magneto-Rayleigh–Taylor instability growth during the implosion of initially solid metal liners

et al. 2011

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“…We are not entirely sure why this occurs. For liner implosions on much longer time scales (0-6 MA in 7 s), Reinovsky et al [9] also observed suppression of short-wavelength MRT modes, but cite solid-state liner material strength as the reason for this suppression. For the fast liner implosions presented in this Letter, however, simulations using ALEGRA, GORGON, and LASNEX all show that the liner is shock compressed and melted very early in the implosion (prior to any significant motion of the inner liner surface), and thus solid-state material strength is not believed to play a significant role in this fast-implosion case.…”

mentioning

confidence: 99%

“…Imploding z-pinch systems are, however, susceptible to the magneto-Rayleigh-Taylor (MRT) instability [6][7][8][9][10][11][12]. For MagLIF, the loss of liner integrity prior to stagnation could cause the concept to fail.…”

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confidence: 99%

Penetrating Radiography of Imploding and Stagnating Beryllium Liners on theZAccelerator

et al. 2012

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The implosions of initially solid beryllium liners (tubes) have been imaged with penetrating radiography through to stagnation. These novel radiographic data reveal a high degree of azimuthal correlation in the evolving magneto-Rayleigh-Taylor structure at times just prior to (and during) stagnation, providing stringent constraints on the simulation tools used by the broader high energy density physics and inertial confinement fusion communities. To emphasize this point, comparisons to 2D and 3D radiation magnetohydrodynamics simulations are also presented. Both agreement and substantial disagreement have been found, depending on how the liner's initial outer surface finish was modeled. The various models tested, and the physical implications of these models are discussed. These comparisons exemplify the importance of the experimental data obtained.

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“…7 This method conserves significant material strength which prevents disruption due to the MRT instability, 8 but the lower implosion velocity-a consequence of the current shaping-may cause significant radiation loss, in addition to allowing instabilities more time to build up. 9 Thus, a tradeoff exists between normal liner implosions and shockless implosions.…”

Section: Introductionmentioning

confidence: 99%

Study of instability formation and EUV emission in thin liners driven with a compact 250 kA, 150 ns linear transformer driver

et al. 2014

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A compact linear transformer driver, capable of producing 250 kA in 150 ns, was used to study instability formation on the surface of thin liners. In the experiments, two different materials, Cu and Ni, were used to study the effect of the liner's resistivity on formation and evolution of the instabilities. The dimensions of the liners used were 7 mm height, 1 mm radius, and 3 lm thickness. Laser probing and time resolved extreme ultraviolet (EUV) imaging were implemented to diagnose instability formation and growth. Time-integrated EUV spectroscopy was used to study plasma temperature and density. A constant expansion rate for the liners was observed, with similar values for both materials. Noticeable differences were found between the Cu and Ni instability growth rates. The most significant perturbation in Cu rapidly grows and saturates reaching a limiting wavelength of the order of the liner radius, while the most significant wavelength in Ni increases slowly before saturating, also at a wavelength close to the liner radius. Evidence suggests that the instability observed is the well-known m ¼ 0 MHD instability. However, upon comparing the instability evolution of Cu and Ni, the importance of the resistivity on the seeding mechanism becomes evident. A comparison of end-on and side-on EUV emission possible indicates the formation of precursor plasma, where it has been estimated using EUV spectroscopy that the precursor plasma temperature is approximately 40 eV with ion density of order 10 19 cm À3 , for both materials. V C 2014 AIP Publishing LLC. [http://dx.

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Instability growth in magnetically imploded high-conductivity cylindrical liners with material strength

Cited by 64 publications

References 12 publications

Measurements of magneto-Rayleigh–Taylor instability growth during the implosion of initially solid metal liners

Measurements of magneto-Rayleigh–Taylor instability growth during the implosion of initially solid metal liners

Penetrating Radiography of Imploding and Stagnating Beryllium Liners on theZAccelerator

Study of instability formation and EUV emission in thin liners driven with a compact 250 kA, 150 ns linear transformer driver

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