Diffusion of a megagauss field into a metal

Garanin, S. F.; Ivanova, G.G.; Karmishin, D. V.; Sofronov, V.N.

doi:10.1007/pl00021891

Cited by 18 publications

(22 citation statements)

References 3 publications

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“…reaches 2.2 MG. The existence of a plasma formation threshold at the few MG level is in qualitative agreement with theoretical and numerical results [6]. The experiment offers the first detailed study of the threshold for plasma formation by pulsed magnetic fields on a thick Al surface.…”

supporting

confidence: 65%

“…This is due in part to the continued availability of fresh underlying cold metal, whose high conductivity reduces the surface electric field and Ohmic heating to values that may be marginal for plasma to form. Although numerical modeling can describe how plasma heats on a surface [6], computational results can vary widely; for a magnetic-field pulse that rises to several MG, calculated peak temperatures may vary by orders of magnitude, from 0.1 to 100 eV. It is challenging to accurately model the interplay of magnetic diffusion, hydrodynamics, radiative energy transfer, and evolving material properties (e.g., resistivity varies by more than 10 orders of magnitude).…”

mentioning

confidence: 98%

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Threshold for Thermal Ionization of an Aluminum Surface by Pulsed Megagauss Magnetic Field

et al. 2010

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The first measurement of the threshold for thermal ionization of the surface of thick metal by pulsed magnetic field (B) is reported. Thick aluminum-with depth greater than the magnetic skin layer-was pulsed with partial differential B/ partial differential t from 30-80 MG/micros. Novel loads avoided nonthermal plasma (from electron avalanche, or energetic particles or photons from arcs). Thermal plasma forms from 6061-alloy aluminum when the surface magnetic field reaches 2.2 MG, in qualitative agreement with numerical simulation results by Garanin et al. [J. Appl. Mech. Tech. Phys. 46, 153 (2005)].

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confidence: 65%

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confidence: 98%

Threshold for Thermal Ionization of an Aluminum Surface by Pulsed Megagauss Magnetic Field

et al. 2010

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“…The one-dimensional calculations were performed using a code [7] with splitting into processes. The hydrodynamic equations were calculated by implicit schemes and magnetic diffusion was calculated by implicit schemes with flow marching.…”

Section: Results Of One-dimensional Calculationsmentioning

confidence: 99%

“…Then, with the unchanged mass of the liner, its thickness will be δ = 0.23 cm. One-dimensional numerical simulation of the implosion of a liner with such initial radius and thickness (below, this experiment will be called LDR) was made using a software [7] with the equation of state and conductivity of aluminum taken from [16].…”

Section: Results Of One-dimensional Calculationsmentioning

confidence: 99%

“…To attain such velocities, it is common to use magnetic fields of the megagauss range, which leads to melting or even vaporization of part of the liner (skin-layer) and its conversion to a plasma [7] and, hence, to a loss of its strength. This gives rise to conditions for the development of Rayleigh-Taylor and sausage instabilities in that part of the liner.…”

Section: Introductionmentioning

confidence: 99%

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On stabilization of implosion of condensed liners

Buiko¹,

Garanin²,

Zmushko³

et al. 2009

J Appl Mech Tech Phy

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This paper considers various experimental designs on the Atlas facility to study the physics of liners and determine the optimum conditions of their stable motion. In one of the versions, in comparison with the Liner Demonstration series of experiments, in which unstable liner motion was observed, it is proposed to reduce the initial liner radius without changing its mass, which, according to twodimensional calculations, should to lead to more stable motion of the liner with unchanged velocity. It is also proposed to perform an experiment in which periodic perturbations at a certain wavelength are created on the outer surface of the liner with a simultaneous increase in its thickness. According to calculations, the growth of chaotic perturbations is stabilized in this case with the preservation of the liner velocity.

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The second type of sharp-front wave mechanism of strong magnetic field diffusion in solid metal

et al. 2019

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When a strong magnetic field diffuses into a metal, the metal is ablated by Joule heating accompanying the magnetic diffusion process, and the metal’s resistance changes violently with the fast-growing temperature. This results in the formation of a so-called “nonlinear diffusion wave” characterized by a sharp “wave-front” where the magnetic field abruptly decays. A metal has its own threshold magnetic field value, which is determined by the critical temperature of the metal. If the constant vacuum magnetic field B0 is above the threshold value Bc, the magnetic diffusion process can be approximately described by sharp-front diffusion wave theory [B. Xiao et al., Physics of Plasmas 23, 082104 (2016)], which gives a simple formula to describe the velocity of the diffusion process. However, if B0 is below Bc, the sharp-front diffusion wave theory is no longer applicable. In this situation, one would need another type of sharp-front diffusion wave theory (type II theory) to describe the magnetic diffusion behaviors. In type II theory, the sharp-front diffusion wave velocity depends on three parameters, i.e., the magnetic boundary condition B0, the critical temperature Tc, and the cold metal resistance ηs. The dependence of the velocity on these three parameters is analyzed in detail in this paper.

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Diffusion of a megagauss field into a metal

Cited by 18 publications

References 3 publications

Threshold for Thermal Ionization of an Aluminum Surface by Pulsed Megagauss Magnetic Field

Threshold for Thermal Ionization of an Aluminum Surface by Pulsed Megagauss Magnetic Field

On stabilization of implosion of condensed liners

The second type of sharp-front wave mechanism of strong magnetic field diffusion in solid metal

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