Publications
114 results found
Bott SC, Haas DM, Eshaq Y, et al., 2009, Study of the effect of current rise time on the formation of the precursor column in cylindrical wire array Z pinches at 1 MA, PHYSICS OF PLASMAS, Vol: 16, ISSN: 1070-664X
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- Citations: 22
Hall GN, Bland SN, Lebedev SV, et al., 2009, Modifying Wire-Array Z-Pinch Ablation Structure and Implosion Dynamics Using Coiled Wires, Pages: 520 -529-520 -529, ISSN: 0093-3813
Harvey-Thompson AJ, Lebedev SV, Bland SN, et al., 2009, Quantitative analysis of plasma ablation using inverse wire array Z pinches, PHYSICS OF PLASMAS, Vol: 16, ISSN: 1070-664X
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- Citations: 41
Ciardi A, Lebedev SV, Frank A, et al., 2009, EPISODIC MAGNETIC BUBBLES AND JETS: ASTROPHYSICAL IMPLICATIONS FROM LABORATORY EXPERIMENTS, Astrophysical Journal Letters, Vol: 691, Pages: L147-L150, ISSN: 2041-8213
Collimated outflows (jets) are ubiquitous in the universe, appearing around sources as diverse as protostars and extragalactic supermassive black holes. Jets are thought to be magnetically collimated, and launched from a magnetized accretion disk surrounding a compact gravitating object. We have developed the first laboratory experiments to address time-dependent, episodic phenomena relevant to the poorly understood jet acceleration and collimation region. The experimental results show the periodic ejections of magnetic bubbles naturally evolving into a heterogeneous jet propagating inside a channel made of self-collimated magnetic cavities. The results provide a unique view of the possible transition from a relatively steady-state jet launching to the observed highly structured outflows.
Suzuki-Vidal F, Lebedev SV, Ciardi A, et al., 2009, Formation of episodic magnetically driven radiatively cooled plasma jets in the laboratory, Astrophysics and Space Science, Vol: 322, Pages: 19-23, ISSN: 1572-946X
We report on experiments in which magneticallydriven radiatively cooled plasma jets were produced by a1 MA, 250 ns current pulse on the MAGPIE pulsed powerfacility. The jets were driven by the pressure of a toroidalmagnetic field in a “magnetic tower” jet configuration. Thisscenario is characterized by the formation of a magneticallycollimated plasma jet on the axis of a magnetic “bubble”,confined by the ambient medium. The use of a radial metallicfoil instead of the radial wire arrays employed in our previouswork allows for the generation of episodic magnetictower outflows which emerge periodically on timescales of∼30 ns. The subsequent magnetic bubbles propagate withvelocities reaching ∼300 km/s and interact with previouseruptions leading to the formation of shocks.
Marocchino A, Chittenden JP, Ciardi A, et al., 2009, Laboratory astrophysics: Episodic jet ejections, Astrophysics and Space Science Proceedings, Pages: 491-496, ISBN: 9789048134984
Recent experiments performed at Imperial College on the pulsed-power magpie facility have successfully shown the formation of magnetically driven radiatively cooled plasma jets formed from radial wire arrays, which are relevant to the study of launching mechanisms in astrophysical jets. The experiments have been now extended to study the episodic ejection (∼ 25 ns) and the interaction of jets and magnetic bubbles with an ambient gas. The dynamics of the interaction is investigated through three-dimensional resistive magneto-hydrodynamic simulations using the code gorgon. Comparison with experiments is offered to validate the results. The ablation process as well as current reconnection is described and analyzed. The complex three-dimensional structure and the confinement/collimation effect offered by the magnetic field are investigated. The scenario is modified introducing a background gas (Ar, ρ ∼ 6.7 ×10-3 kg/m3), collimation effects are investigated for the new set-up.
Suzuki-Vidal F, Lebedev SV, Ciardi A, et al., 2009, Formation of Episodic Magnetically Driven Radiatively Cooled Plasma Jets in Laboratory Experiments, Pages: 195-204, ISSN: 1570-6591
We report on experiments in which magnetically driven radiatively cooled plasma jets were produced by a 1 MA, 250 ns current pulse on the MAGPIE pulsed power facility. The jets were driven by the pressure of a toroidal magnetic field in a “magnetic tower” jet configuration. This scenario is characterized by the formation of a magnetically collimated plasma jet on the axis of a magnetic cavity, confined by the ambient medium. The use of a radial metallic foil instead of the radial wire arrays employed in our previous work allows for the generation of episodic magnetic tower outflows which emerge periodically on timescales of ∼ 30 ns. The subsequent magnetic bubbles propagate with velocities reaching ∼ 300 km/s and interact with previous eruptions. This setup also allowed for the addition of a neutral gas above the foil in order to study the effect of the ambient density on the dynamics of both the early time hydrodynamic jet formed from plasma ablated from the foil and of the subsequent magnetic tower outflows.
Hall GN, Bland SN, Lebedev SV, et al., 2009, Modifying Wire Array Z-pinch Ablation Structure and Implosion Dynamics Using Coiled Arrays, 7th International Conference on Dense Z-Pinches, Publisher: AMER INST PHYSICS, Pages: 89-+, ISSN: 0094-243X
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- Citations: 4
Ampleford DJ, Lebedev SV, Ciardi A, et al., 2009, Astrophysical Jets with Conical Wire Arrays: Radiative Cooling, Rotation & Deflection, 7th International Conference on Dense Z-Pinches, Publisher: AMER INST PHYSICS, Pages: 83-+, ISSN: 0094-243X
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- Citations: 1
Cabrit S, Bocchi M, Camenzind M, et al., 2009, DYNAMICS OF MAGNETIZED YSO JETS: EXAMPLES OF RESULTS FROM THE JETSET NETWORK, 2nd Conference on Magnetic Fields in the Universe - From Laboratory and Stars to Primordial Structures, Publisher: UNIVERSIDAD NACIONAL AUTONOMA MEXICO INSTITUTO ASTRONOMIA, Pages: 171-+, ISSN: 1405-2059
Niasse N, Chittenden JP, Bland SN, et al., 2009, 3D MHD Simulations of Radial Wire Array Z-pinches, Publisher: AIP, Pages: 125-128-125-128
Harvey-Thompson AJ, Lebedev SV, Bland SN, et al., 2009, Quantitative Analysis of Plasma Ablation Using Inverse Wire Array Z-pinches, 7th International Conference on Dense Z-Pinches, Publisher: AMER INST PHYSICS, Pages: 105-+, ISSN: 0094-243X
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- Citations: 2
Palmer JBA, Bott SC, Bland SN, et al., 2008, Radiography of foam targets in wire-array <i>Z</i>-pinches, IEEE TRANSACTIONS ON PLASMA SCIENCE, Vol: 36, Pages: 1272-1273, ISSN: 0093-3813
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- Citations: 3
Favre M, Wyndham E, Lenero AM, et al., 2008, Experimental observations in compact capillary discharges, 28th International Conference on Phenomena in Ionized Gases, Publisher: IOP PUBLISHING LTD, ISSN: 0963-0252
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- Citations: 15
Hall GN, Chittenden JP, Bland SN, et al., 2008, Modifying wire-array z-pinch ablation structure using coiled arrays, PHYSICAL REVIEW LETTERS, Vol: 100, ISSN: 0031-9007
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- Citations: 25
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.
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
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
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
Suzuki F, Veloso F, Molina F, et al., 2006, Refractive optical measurements on the Llampudken generator, 11th Latin American Workshop on Plasma Physics, Publisher: AMER INST PHYSICS, Pages: 453-+, ISSN: 0094-243X
Suzuki F, Mitchell I, Gomez J, et al., 2006, Dynamics of X-pinches on the Llampudken generator at 400kA, 6th International Conference on Dense Z-Pinches, Publisher: AMER INST PHYSICS, Pages: 157-+, ISSN: 0094-243X
Favre M, Lenero AM, Suzuki F, et al., 2006, Experimental investigation of ionization waves in fast pulsed capillary discharges, 11th Latin American Workshop on Plasma Physics, Publisher: AMER INST PHYSICS, Pages: 419-+, ISSN: 0094-243X
Favre M, Aliaga-Rossel R, Pernas A, et al., 2006, Z-pinch like experimental arrangements, 11th Latin American Workshop on Plasma Physics, Publisher: AMER INST PHYSICS, Pages: 409-+, ISSN: 0094-243X
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