Publications
312 results found
Ampleford DJ, Lebedev SV, Bland SN, et al., 2007, Dynamics of conical wire array Z-pinch implosions, PHYSICS OF PLASMAS, Vol: 14, ISSN: 1070-664X
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- Citations: 39
Lebedev SV, 2007, High Energy Density Laboratory Astrophysics, Publisher: Springer Verlag, ISBN: 9781402060540
Every two years, at the International conference on High Energy Density Laboratory Astrophysics, scientists interested in this emerging field discuss the progress in topics covering:- Stellar evolution, stellar envelopes, opacities, ...
Ciardi A, Lebedev SV, Frank A, et al., 2007, The evolution of magnetic tower jets in the laboratory, Physics of Plasmas, Vol: 14, ISSN: 1089-7674
The evolution of laboratory produced magnetic jets is followed numerically throughthree-dimensional, nonideal magnetohydrodynamic simulations. The experiments are designed tostudy the interaction of a purely toroidal field with an extended plasma background medium. Thesystem is observed to evolve into a structure consisting of an approximately cylindrical magneticcavity with an embedded magnetically confined jet on its axis. The supersonic expansion producesa shell of swept-up shocked plasma that surrounds and partially confines the magnetic tower.Currents initially flow along the walls of the cavity and in the jet but the development ofcurrent-driven instabilities leads to the disruption of the jet and a rearrangement of the field andcurrents. The top of the cavity breaks up, and a well-collimated, radiatively cooled, “clumpy” jetemerges from the system.
Ciardi A, Lebedev SV, Frank A, et al., 2007, The evolution of magnetic tower jets in the laboratory - art. no. 056501, 48th Annual Meeting of the Division of Plasma Physics of the APS, Pages: 56501-56501
The evolution of laboratory produced magnetic jets is followed numerically through three-dimensional, nonideal magnetohydrodynamic simulations. The experiments are designed to study the interaction of a purely toroidal field with an extended plasma background medium. The system is observed to evolve into a structure consisting of an approximately cylindrical magnetic cavity with an embedded magnetically confined jet on its axis. The supersonic expansion produces a shell of swept-up shocked plasma that surrounds and partially confines the magnetic tower. Currents initially flow along the walls of the cavity and in the jet but the development of current-driven instabilities leads to the disruption of the jet and a rearrangement of the field and currents. The top of the cavity breaks up, and a well-collimated, radiatively cooled, "clumpy" jet emerges from the system. (C) 2007 American Institute of Physics.
Bland SN, Lebedev SV, Chittenden JP, et al., 2007, Implosion and stagnation of wire array Z pinches - art. no. 056315, 48th Annual Meeting of the Division of Plasma Physics of the APS, Pages: 56315-56315
Detailed measurements of the dynamics of aluminum wire array Z pinches from immediately prior to implosion until stagnation and dissipation on axis are presented. Before implosion, the -0.5 mm axial modulation seen in earlier laser probing images is observed as ablation on the surface of the wire cores facing away from the array axis. This results in the complete ablation of sections of the wire cores and a redistribution of current at the start of implosion. The dynamics of implosion are then strongly influenced by the number of wires in the array. With only eight wires, discrete snowplough bubbles expand from each wire toward the precursor. There is little, if any, correlation between the bubbles from adjacent wires, and a large temporal spread over which the bubbles arrive at the precursor is observed, along with a long rise time, low power soft x-ray pulse. With 32 or more wires, bubbles from adjacent wires merge close to the array edge to form an imploding sheath. The front edge of the sheath is well defined with a small spatial spread, and upon reaching the precursor, the start of a fast rising high power soft-x-ray pulse is seen. As x-ray emission increases, the stagnating column on axis starts to decrease in diameter, reaching a minimum at peak x-ray emission, which also coincides with the time when the rear edge of the snowplough reaches the column. Thereafter, the stagnated column is seen to go unstable, and trailing mass left behind during the implosion is accelerated toward the axis. Intense x-ray emission ends as this mass becomes cleared out. (C) 2007 American Institute of Physics.
Bland SN, Lebedev SV, Chittenden JP, et al., 2007, Implosion and stagnation of wire array Z pinches, 48th Annual Meeting of the Division of Plasma Physics of the APS, Publisher: AIP Publishing, ISSN: 1070-664X
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- Citations: 24
Bott SC, Lebedev SV, Bland SN, et al., 2007, The formation of precursor structures in cylindrical and "4 x 4" wire arrays, 33rd International Conference on Plasma Science, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 165-170, ISSN: 0093-3813
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- Citations: 4
Yu EP, Oliver BV, Sinars DB, et al., 2007, Steady-state radiation ablation in the wire-array Z pinch, PHYSICS OF PLASMAS, Vol: 14, ISSN: 1070-664X
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- Citations: 48
Chittenden JP, Ciardi A, Jennings CA, et al., 2007, Structural evolution and formation of high-pressure plasmas in <i>X</i> pinches, PHYSICAL REVIEW LETTERS, Vol: 98, ISSN: 0031-9007
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- Citations: 45
Ciardi A, Lebedev SV, Frank A, et al., 2007, 3D MHD simulations of laboratory plasma jets, 6th International Conference on High Energy Density Laboratory Astrophysics, Publisher: SPRINGER, Pages: 17-22, ISSN: 0004-640X
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- Citations: 6
Ampleford DJ, Ciardi A, Lebedev SV, et al., 2007, Jet deflection by a quasi-steady-state side wind in the laboratory, 6th International Conference on High Energy Density Laboratory Astrophysics, Publisher: SPRINGER, Pages: 29-34, ISSN: 0004-640X
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- Citations: 15
Ampleford DJ, Lebedev SV, Ciardi A, et al., 2007, Laboratory modeling of standing shocks and radiatively cooled jets with angular momentum, 6th International Conference on High Energy Density Laboratory Astrophysics, Publisher: SPRINGER, Pages: 51-56, ISSN: 0004-640X
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- Citations: 11
Bott SC, Lebedev SV, Ampleford DJ, et al., 2006, Dynamics of cylindrically converging precursor plasma flow in wire-array <i>Z</i>-pinch experiments, PHYSICAL REVIEW E, Vol: 74, ISSN: 1539-3755
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- Citations: 61
Calamy H, Hamann F, Lassalle F, et al., 2006, Characteristics of microsecond wire array <i>Z</i>-pinches on SPHINX machine, IEEE TRANSACTIONS ON PLASMA SCIENCE, Vol: 34, Pages: 2279-2287, ISSN: 0093-3813
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- Citations: 12
Bland SN, Ampleford DJ, Bott SC, et al., 2006, Use of Faraday probing to estimate current distribution in wire array <i>z</i> pinches, 16th Topical Conference on High-Temperature Plasma Diagnostics, Publisher: AMER INST PHYSICS, ISSN: 0034-6748
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- Citations: 12
Bland SN, Ampleford DJ, Bott SC, et al., 2006, Use of Faraday probing to estimate current distribution in wire array z pinches - art. no. 10E315, 16th Topical Conference on High-Temperature Plasma Diagnostics, Pages: E315-E315
In order to understand the formation and dynamics of plasma in wire array z-pinch experiments, measurements of the distribution of current throughout the array are required. We present details of two Faraday probing diagnostics aimed at exploring the magnetic fields and hence distribution of current in an array. An imaging Faraday system utilizes a short laser pulse to make estimates of the current distribution in the precursor column formed on axis before implosion. In a second system, a rod of high Verdet constant glass is placed close to the wires of an array and the polarization of a cw laser passing through the rod is monitored to examine the variance of current with time. (c) 2006 American Institute of Physics.
Bland SN, Bott SC, Hall GN, et al., 2006, Diagnostics for studying the dynamics of wire array <i>Z</i> pinches, 16th Topical Conference on High-Temperature Plasma Diagnostics, Publisher: AMER INST PHYSICS, ISSN: 0034-6748
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- Citations: 5
Ciardi A, Lebedev SV, Stehle C, et al., 2006, Laboratory models for astrophysical jets, 4th International Conference on Inertial Fusion Sciences and Applications, Publisher: EDP SCIENCES S A, Pages: 1043-1045, ISSN: 1155-4339
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- Citations: 1
Jones B, Garasi CJ, Ampleford DJ, et al., 2006, Measurement and modeling of the implosion of wire arrays with seeded instabilities, ISSN: 1070-664X
In order to study wire array Z-pinch instabilities, perturbations have been seeded by etching 15 μm diameter aluminum wires to introduce 20% modulations in radius with a controlled axial wavelength. These perturbations seed additional imploding structures that are studied experimentally on the 1 MA, 250 ns MAGPIE generator [S. V. Lebedev, Plasma Phys. Control. Fusion 47, A91 (2005)] and with three-dimensional magnetohydrodynamic calculations using the ALEGRA-HEDP [A. C. Robinson and C. J. Garasi, Comput. Phys. Commun. 164, 408 (2004)] and GORGON [J. P. Chittenden, Plasma Phys. Control. Fusion 46, B457 (2004)] codes. Simulations indicate that current path nonuniformity at discontinuities in the wire radius result in perturbation-induced magnetic bubble formation. Imploding bubbles originating from discontinuities are observed experimentally, and their collision on axis determines the start of the main x-ray pulse rise. These mechanisms likely govern dynamics of standard wire array Z pinches, and tailoring the profile of imploding mass may allow x-ray pulse shaping for inertial confinement fusion applications. © 2006 American Institute of Physics.
Cuneo ME, Sinars DB, Waisman EM, et al., 2006, Compact single and nested tungsten-wire-array dynamics at 14-19 MA and applications to inertial confinement fusion, 47th Annual Meeting of the Division of Plasma Physics of the American-Physical-Society, Publisher: AIP Publishing, ISSN: 1070-664X
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- Citations: 74
Jones B, Garasi CJ, Ampleford DJ, et al., 2006, Measurement and modeling of the implosion of wire arrays with seeded instabilities, 47th Annual Meeting of the Division of Plasma Physics of the American-Physical-Society, Publisher: AIP Publishing, ISSN: 1070-664X
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- Citations: 13
Sinars DB, Cuneo ME, Yu EP, et al., 2006, Measurements and simulations of the ablation stage of wire arrays with different initial wire sizes, PHYSICS OF PLASMAS, Vol: 13, ISSN: 1070-664X
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- Citations: 39
Cuneo ME, Vesey RA, Bennett GR, et al., 2006, Progress in symmetric ICF capsule implosions and wire-array <i>z</i>-pinch source physics for double-pinch-driven hohlraums, 32nd European-Physical-Society Conference on Plasma Physics, Publisher: IOP PUBLISHING LTD, Pages: R1-R35, ISSN: 0741-3335
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- Citations: 77
Ampleford DJ, Lebedev SV, Chittenden JP, et al., 2006, Implosion dynamics in conical wire array Z-pinches, Dense Z-Pinches, Vol: 808, Pages: 33-36, ISSN: 0094-243X
Jennings CA, Chittenden JP, Ciardi A, et al., 2006, 3D resistive, radiative MHD modeling of z-pinches, Dense Z-Pinches, Vol: 808, Pages: 57-60, ISSN: 0094-243X
Lebedev SV, Ampleford DJ, Bland SN, et al., 2006, Recent wire array experiments on the MAGPIE generator, Dense Z-Pinches, Vol: 808, Pages: 69-72, ISSN: 0094-243X
Bott SC, Lebedev SV, Bland SN, et al., 2006, Plasma ablation and precursor column formation in wire-array Z-pinches, Dense Z-Pinches, Vol: 808, Pages: 37-40, ISSN: 0094-243X
Calamy H, Hamann F, Lassalle F, et al., 2006, Wire array Z-pinches on SPHINX machine: Experimental results and relevant points of microsecond implosion physics, 6th International Conference on Dense Z-Pinches, Publisher: AMER INST PHYSICS, Pages: 15-+, ISSN: 0094-243X
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- Citations: 5
Lebedev SV, Ciardi A, Ampleford D, et al., 2006, Laboratory experiments with supersonic radiatively cooled jets: Jet deflection via crosswinds and magnetic tower outflows, Superstrong Fields in Plasmas, Vol: 827, Pages: 329-340, ISSN: 0094-243X
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