Shock-induced conduction waves in electrophysical experiments

Bichenkov, E. I.; Гилев, С. Д.; Trubachev, A. M.

doi:10.1007/bf00852180

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…In addition to the fundamental aspects, interest in shock metallization is stimulated by a number of applications. At present shock-induced conductivity is used for generating and governing electromagnetic energy flows in high power systems: generators of electromagnetic energy density [26][27][28], current switches [29,30], generation of radiation pulses [31]. This paper advances previous investigations in the field [32,33] and covers recent results.…”

Section: Introductionmentioning

confidence: 99%

Metallization of silicon in a shock wave: the metallization threshold and ultrahigh defect densities

Гилев¹,

Trubachev²

2004

J. Phys.: Condens. Matter

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Time-resolved electrical conductivity measurements on monocrystalline doped silicon are performed under shock compression up to 23 GPa followed by release. With increasing normal stress, the electrical conductivity of silicon increases monotonically by five orders of magnitude and reaches that of 'poor' metals. The stress dependence of the conductivity comprises two parts: a steep rise and a 'plateau'. The 'plateau' conductivity corresponds to the metallic state of silicon; it does not depend on the compression regime or the doping type or amount of impurity. The onset of the metallic phase corresponds to a shock stress of about 10 GPa; most of the specimen is metallic at 12 GPa. The state of shock-compressed silicon proves to be extremely defective. The defect concentration in shocked silicon exceeds the equilibrium concentration by five orders of magnitude and exceeds the defect concentration in classic metals by an order of magnitude. This indicates distinctive features of brittle solid deformation. Experimentally, the metallic phase proves to be metastable. Releasing stress causes a temporary delay of the reverse transition. List of symbols P x Stress σThe electrical conductivity τThe characteristic time of current relaxation L s L x The shunt inductance and specimen inductance, respectively R s R x The shunt resistance and specimen resistance, respectively V Voltages through the electrodes V 0 Initial voltages through the electrodes

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Section: Introductionmentioning

confidence: 99%

Metallization of silicon in a shock wave: the metallization threshold and ultrahigh defect densities

Гилев¹,

Trubachev²

2004

J. Phys.: Condens. Matter

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“…The same time scale is characteristic of other concepts of MFC generators, 5 e.g., of those compressing magnetic flux with a converging cylindrical shock wave that converts a dielectric medium into a conductor. 6 The MFC concept could be advanced to generate currents and fields with nanosecond-range rise times. To make it work the velocity of the conducting liner that compresses the magnetic flux should be of order of 100 km/s.…”

Section: Introductionmentioning

confidence: 99%

Confinement and compression of magnetic flux by plasma shells

Rudakov¹,

Chuvatin

Velikovich

et al. 2003

Physics of Plasmas

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Confinement and compression of magnetic flux by plasma shells is of interest for a variety of applications associated with keV x-ray production in pulsed-power driven Z-pinch plasma radiation sources ͑PRS͒. Confinement of a B z field with a B field of the pinch current can help stabilize the implosion of a shell from a large initial radius. Compression of the azimuthal magnetic flux in the PRS ͑secondary͒ circuit with a plasma shell driven by B field of the primary circuit may represent a new opportunity for using a low-cost, relatively slow pulsed power to generate large amounts of keV x rays. The magnetic field has to be compressed and/or confined by low-mass plasma shells emitting soft x-ray radiation that limits the temperature and conductivity of the shell plasma. The thickness of a plasma shell is established self-consistently during the implosion, and it is not obvious whether or not the shell becomes thick enough to confine or compress the magnetic flux. The results of analytical theory and numerical simulations demonstrate that the flux-compressing capability of a low-beta plasma shell is surprisingly good because the shell is shown to dynamically adjust its thickness so that it always remains of the order of its skin depth. The self-similar profiles of confined magnetic field predicted by the theory are consistently reproduced in the simulations.

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“…Second, the powder conductivity appears in a stepwise manner in the shock wave and further remains constant. Such behaviour was found for powders of metals [24], silicon [25] and selenium [26]. Third, the conductivity is independent of shock pressure and is uniform throughout the compressed matter.…”

Section: Modelmentioning

confidence: 65%

Model of shock-wave magnetic cumulation

Гилев¹

2008

J. Phys. D: Appl. Phys.

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A shock-wave magnetic cumulation technique is used to generate a megagauss magnetic field in an aluminium powder under quasi-cylindrical geometry. A magnetohydrodynamic (MHD) model of shock-wave magnetic cumulation is proposed. The model is based on the Oh–Persson equation of state and experimental data on electrical conductivity of powders. The 1D simulation reveals the features of the MHD flow under converging of the cylindrical shock wave. The experimental record of the magnetic field in the generator is in reasonable agreement with simulation results. This fact validates the model and allows one to optimize the cumulation system for producing a higher magnetic field.

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Shock-induced conduction waves in electrophysical experiments

Cited by 10 publications

References 21 publications

Metallization of silicon in a shock wave: the metallization threshold and ultrahigh defect densities

Metallization of silicon in a shock wave: the metallization threshold and ultrahigh defect densities

Confinement and compression of magnetic flux by plasma shells

Model of shock-wave magnetic cumulation

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