An Insulator-Metallic Phase Transition Cascade for Improved Electromagnetic Flux-Compression in&amp;lt;tex&amp;gt;$theta $&amp;lt;/tex&amp;gt;-Pinch Geometry

Novac, B.M.; Smith, I.R.; Rankin, D.F.; Hubbard, M.

doi:10.1109/tps.2004.835445

Cited by 11 publications

(7 citation statements)

References 21 publications

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“…It also leads to an important conclusion: metallization of aluminium powders occurs in a shock wave carrying full pressure. Thus, our results do not confirm the conclusion [13,28] about metallization of an aluminium powder in an elastic precursor. The elastic precursor is not registered in aluminium powders by known techniques [17][18][19][20][21][22][23].…”

Section: Discussioncontrasting

confidence: 99%

“…The insulator-metal transition in high-porous powders is used to produce megagauss magnetic fields by the shockwave magnetic cumulation method [1][2][3][4][5][6][7][8][9][10][11][12][13]. An initially nonconductive powder acquires electrical conductance in a shock wave and compresses a prior generated magnetic flux.…”

Section: Introductionmentioning

confidence: 99%

“…A shock wave in the powder shorts the coil helices, which allows one to find the instantaneous position of the shock front. Novac et al [13,28] concluded that metallization of an aluminium powder occurs in an elastic precursor, which moves ahead of the main shock wave carrying full pressure. For the technique [28], shock compression of the powder is not in fact 1D.…”

Section: Introductionmentioning

confidence: 99%

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Magnetoelectrical technique for studying the insulator–metal transition under shock compression

Гилев

2007

J. Phys. D: Appl. Phys.

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The paper describes a magnetoelectrical technique for monitoring the particle velocity in matter acquiring a large electrical conductivity under shock compression. The particle velocity is measured in the electromagnetic skin layer, which travels through matter with a wave velocity. The layer thickness essentially depends on the electrical conductivity of shock-compressed matter. A multielectrode cell also allows the wave velocity to be registered at various spatial bases. Experiments give kinematics parameters of a metallization wave for aluminium powders of varied mass density and particle size. The results unambiguously testify that the conductivity of the aluminium powder arises in the main shock wave carrying full pressure. The results do not confirm the conclusion of Novac et al about metallization of the aluminium powder in an elastic precursor. The thickness of the skin layer for a coarse powder is smaller than the thickness of the shock-compression zone, which offers the opportunity of finding the metallization phase directly in the shock transition zone.

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Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetoelectrical technique for studying the insulator–metal transition under shock compression

Гилев

2007

J. Phys. D: Appl. Phys.

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“…A definitive explanation for this phenomenon is unavailable at present, although charge separation followed by circular plasma discharge in the vacuum chamber could represent a possibility. A bright circular plasma being ejected from the chamber has certainly been experimentally observed and reported in [15], and the direct interaction of this with the probe circuitry can indeed produce the unwanted effects. However, the way this plasma connects through the probe shield remains unknown.…”

Section: Magnetic Field Sensorsmentioning

confidence: 91%

A fast and compact θ-pinch electromagnetic flux-compression generator

Novac¹,

Smith²,

Rankin³

et al. 2004

J. Phys. D: Appl. Phys.

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Ultrahigh magnetic fields up to 300 T (3 MG) have been generated by electromagnetic flux compression using only 63 kJ from a fast capacitor bank to implode aluminium liners, with 14.7 kJ from a slow capacitor bank needed to provide an initial magnetic field. With no initial field present, pulses of magnetic flux density having a time rate-of-change exceeding 3 × 108 T s−1 have been produced and measured, opening the way for a range of dynamic transformer applications. The outcome of the work suggests that, when using fast multi-MA banks, flux compression can be viewed as an alternative to the single-turn coil technique that will move the boundary of the magnetic fields well beyond 300 T without the need for significant additional investments.

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“…More recently, the same basic approach was adopted at Loughborough in two important applications of an ongoing research program, but with the shock wave being produced by means of exploding foils. In the first application it was used in the production of high voltage pulses [3] and in the second simultaneously to stabilize electromagnetically driven coil implosions and to provide improved protection for sensors [4]. Uniquely, this enabled both the up and down sweeps of the magnetic pulse to be recorded [5].…”

Section: Introductionmentioning

confidence: 99%

Magnetic flux-compression driven by exploding single-turn coils

Novac

Hook

Smith

2010

2010 IEEE International Power Modulator and High Voltage Conference

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A novel hybrid approach to producing ultrahigh magnetic fields has been successfully demonstrated using a 20 kJ capacitor bank. The explosion of a single-turn copper coil at peak field is used to generate shock-waves, which in turn produce in the aluminum powder filling the single-turn coil a circular insulatormetallic transition advancing towards the coil centre and performing magnetic flux-compression. The flux compression almost precisely doubles the initial flux density generated by the coil, so that some of the Joule energy deposited in the coil is re-use during the process as kinetic energy, rather than being lost as in a standard single-turn experiment. Attempts to scale up the basic arrangement to 80 kJ were only partially successful, but it was nevertheless possible to significantly prolong the duration of the megagauss field that was produced. It is believed that a hybrid method using small explosive charges to produce the shock-waves necessary for flux-compression can certainly be used when attempting to produce record magnetic flux densities in indoor experiments, without the need for a large and costly MJ size capacitor bank.

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An Insulator-Metallic Phase Transition Cascade for Improved Electromagnetic Flux-Compression in<tex>$theta $</tex>-Pinch Geometry

Cited by 11 publications

References 21 publications

Magnetoelectrical technique for studying the insulator–metal transition under shock compression

Magnetoelectrical technique for studying the insulator–metal transition under shock compression

A fast and compact θ-pinch electromagnetic flux-compression generator

Magnetic flux-compression driven by exploding single-turn coils

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