Publications
224 results found
Suzuki-Vidal F, Lebedev SV, Ciardi A, et al., 2014, Laboratory Astrophysics Experiments with Magnetically Driven Plasma Jets, 15th International Congress on Plasma Physics (ICPP) / 13th Latin American Workshop on Plasma Physics (LAWPP), Publisher: IOP PUBLISHING LTD, ISSN: 1742-6588
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- Citations: 2
Suzuki Vidal F, Patankar S, Lebedev SV, et al., 2013, Observation of energetic protons trapped in laboratory magnetic-tower jets, New Journal of Physics, Vol: 15, ISSN: 1367-2630
Preliminary results of the self-emission of charged particles frommagnetically driven plasma jets has been investigated. The jets were launchedand driven by a toroidal magnetic field generated by introducing a ∼1.4 MA,250 ns electrical current pulse from the MAGPIE generator into a radialwire array. This configuration has shown to reproduce some aspects of theastrophysical magnetic-tower jet launching model, in which a jet is collimatedby a toroidal magnetic field inside a magnetic cavity. The emission of ions andprotons from the plasma was recorded onto Columbia Resin 39 plates using timeintegratedpinhole cameras. In addition a fly-eye camera, an array of 25–496cylindrical apertures allowed estimating the location of the ion emitting source.The results show the ion emission comes from both the jet and its surroundingmagnetic cavity, with the emission extending to a height of at least ∼9 cm fromthe initial position of the wires. The emission of ions is consistent with the dynamics of the jet obtained from time-resolved imaging diagnostics, i.e. opticallaser probing and self-emission of the plasma in the extreme ultra-violet. Thesepreliminary results suggest the ions are trapped inside the cavity due to the strongtoroidal magnetic field which drives the jet. In addition these studies providefirst estimates of the energy and fluence of protons for future laser-driven protonprobing diagnostics aimed at measuring the magnetic field in these experiments.
Weinwurm M, Bland SN, Chittenden JP, 2013, Metal liner-driven quasi-isentropic compression of deuterium, PHYSICS OF PLASMAS, Vol: 20, ISSN: 1070-664X
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- Citations: 6
Swadling GF, Lebedev SV, Hall GN, et al., 2013, Shock-less interactions of ablation streams in tungsten wire array z-pinches, PHYSICS OF PLASMAS, Vol: 20, ISSN: 1070-664X
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- Citations: 18
Burdiak GC, Lebedev SV, Hall GN, et al., 2013, Determination of the inductance of imploding wire array Z-pinches using measurements of load voltage, Physics of Plasmas, Vol: 20, ISSN: 1089-7674
The inductance of imploding cylindrical wire array z-pinches has been determined frommeasurements of load voltage and current. A thorough analysis method is presented that explainshow the load voltage of interest is found from raw signals obtained using a resistive voltagedivider. This method is applied to voltage data obtained during z-pinch experiments carried out onthe MAGPIE facility (1.4 MA, 240 ns rise-time) in order to calculate the load inductance andthereafter the radial trajectory of the effective current sheath during the snowplough implosion.Voltage and current are monitored very close to the load, allowing these calculations to be carriedout without the need for circuit modelling. Measurements give a convergence ratio for the currentof between 3.1 and 5.7 at stagnation of the pinch.
Suzuki-Vidal F, Lebedev SV, Krishnan M, et al., 2013, Interaction of radiatively cooled plasma jets with neutral gases for laboratory astrophysics studies, HIGH ENERGY DENSITY PHYSICS, Vol: 9, Pages: 141-147, ISSN: 1574-1818
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- Citations: 20
Burdiak GC, Lebedev SV, Drake RP, et al., 2013, The production and evolution of multiple converging radiative shock waves in gas-filled cylindrical liner z-pinch experiments, HIGH ENERGY DENSITY PHYSICS, Vol: 9, Pages: 52-62, ISSN: 1574-1818
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- Citations: 16
Hall GN, Lebedev SV, Suzuki Vidal F, et al., 2013, Ablation dynamics in coiled wire-array Z-pinches, Physics of Plasmas, Vol: 20, ISSN: 1089-7674
Experiments to study the ablation dynamics of coiled wire arrays were performed on the MAGPIEgenerator (1 MA, 240 ns) at Imperial College, and on the COBRA generator at Cornell University’sLaboratory of Plasma Studies (1 MA, 100 ns). The MAGPIE generator was used to drive coiled wiresin an inverse array configuration to study the distribution of ablated plasma. Using interferometry tostudy the plasma distribution during the ablation phase, absolute quantitative measurements ofelectron line density demonstrated very high density contrasts between coiled ablation streams andinter-stream regions many millimetres from the wire. The measured density contrasts for a coiledarray were many times greater than that observed for a conventional array with straight wires,indicating that a much greater axial modulation of the ablated plasma may be responsible for theunique implosion dynamics of coiled arrays. Experiments on the COBRA generator were used tostudy the complex redirection of plasma around a coiled wire that gives rise to the ablation structureexhibited by coiled arrays. Observations of this complex 3D plasma structure were used to validatethe current model of coiled array ablation dynamics [Hall et al., Phys. Rev. Lett. 100, 065003(2008)], demonstrating irrefutably that plasma flow from the wires behaves as predicted. Coiled wireswere observed to ablate and implode in the same manner on both machines, indicating that currentrise time should not be an issue for the scaling of coiled arrays to larger machines with fast currentrise times.
Swadling GF, Lebedev SV, Niasse N, et al., 2013, Oblique shock structures formed during the ablation phase of aluminium wire array z-pinches, PHYSICS OF PLASMAS, Vol: 20, ISSN: 1070-664X
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- Citations: 45
Lebedev SV, Suzuki-Vidal F, Bocchi M, et al., 2013, University of Rochester, Rochester, NY, USA EXPERIMENTAL STUDIES OF SUPERSONIC RADIATIVELY COOLED PLASMA JETS, ECLA: European Conference on Laboratory Astrophysics, Publisher: E D P SCIENCES, Pages: 133-+, ISSN: 1633-4760
Suzuki-Vidal F, Bocchi M, Lebedev SV, et al., 2013, JET-AMBIENT INTERACTION OF A SUPERSONIC, RADIATIVELY-COOLED JET IN LABORATORY EXPERIMENTS, ECLA: European Conference on Laboratory Astrophysics, Publisher: E D P SCIENCES, Pages: 127-+, ISSN: 1633-4760
Ampleford DJ, Bland SN, Cuneo ME, et al., 2012, Demonstration of Radiation Pulse-Shaping Capabilities Using Nested Conical Wire-Array <i>Z</i>-Pinches, IEEE TRANSACTIONS ON PLASMA SCIENCE, Vol: 40, Pages: 3334-3346, ISSN: 0093-3813
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- Citations: 2
Ampleford DJ, Jennings CA, Lebedev SV, et al., 2012, Shock model description of the interaction radiation pulse in nested wire array z-pinches, PHYSICS OF PLASMAS, Vol: 19, ISSN: 1070-664X
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- Citations: 3
Suzuki-Vidal F, Lebedev SV, Bocchi M, et al., 2012, Experimental study of shock waves from the interaction of a supersonic plasma jet with an ambient gas, SHOCK WAVES, Vol: 22, Pages: 249-251, ISSN: 0938-1287
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- Citations: 3
Harvey-Thompson AJ, Lebedev SV, Patankar S, et al., 2012, Optical Thomson Scattering Measurements of Plasma Parameters in the Ablation Stage of Wire Array Z Pinches, Physical Review Letters, Vol: 108, Pages: 145002-1-145002-5
Harvey-Thompson AJ, Lebedev SV, Patankar S, et al., 2012, Optical Thomson scattering measurements of cylindrical wire array parameters, Physics of Plasmas, Vol: 19, Pages: 056303-1-056303-10, ISSN: 1070-664X
Suzuki-Vidal F, Bocchi M, Lebedev SV, et al., 2012, Interaction of a supersonic, radiatively cooled plasma jet with an ambient medium, PHYSICS OF PLASMAS, Vol: 19, ISSN: 1070-664X
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- Citations: 26
Suzuki-Vidal F, Lebedev SV, Krishnan M, et al., 2012, Laboratory astrophysics experiments studying hydrodynamic and magnetically-driven plasma jets, 14th Latin American Workshop on Plasma Physics (LAWPP), Publisher: IOP PUBLISHING LTD, ISSN: 1742-6588
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- Citations: 7
Suzuki-Vidal F, Lebedev SV, Bland SN, et al., 2011, Experimental Studies of Magnetically Driven Plasma Jets, Astrophysics and Space Science, Vol: 336, Pages: 41-46, ISSN: 1572-946X
We present experimental results on the formationof supersonic, radiatively cooled jets driven by pressuredue to the toroidal magnetic field generated by the 1.5 MA,250 ns current from the MAGPIE generator. The morphologyof the jet produced in the experiments is relevant toastrophysical jet scenarios in which a jet on the axis of amagnetic cavity is collimated by a toroidal magnetic fieldas it expands into the ambient medium. The jets in the experimentshave similar Mach number, plasma beta and coolingparameter to those in protostellar jets. Additionally theReynolds, magnetic Reynolds and Peclet numbers are muchlarger than unity, allowing the experiments to be scaled toastrophysical flows. The experimental configuration allowsfor the generation of episodic magnetic cavities, suggestingthat periodic fluctuations near the source may be responsiblefor some of the variability observed in astrophysical jets.Preliminary measurements of kinetic, magnetic and Poyntingenergy of the jets in our experiments are presented and discussed, together with estimates of their temperature andtrapped toroidal magnetic field.
Ampleford DJ, Bland SN, Lebedev SV, et al., 2011, Extreme-UV Self-Emission From Plasma-Focus Radial Wire Array, IEEE TRANSACTIONS ON PLASMA SCIENCE, Vol: 39, Pages: 2420-2421, ISSN: 0093-3813
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- Citations: 1
Suzuki-Vidal F, Lebedev SV, Swadling G, et al., 2011, Interaction of a Supersonic Plasma Jet With an Argon Ambient Using Laser Interferometry, IEEE Transactions on Plasma Science, Vol: 39, Pages: 2830-2831
Highly supersonic radiatively cooled plasma jets are produced by introducing a 1-MA 250-ns current pulse from the MAGPIE generator into a radial foil. The setup allows for the introduction of a neutral gas above the foil, in order to study the jet-ambient interaction. The dynamics are characterized by the formation of several shock features, which are imaged using laser interferometry. This diagnostic also allows to measure the electron density of the plasma, and examples of such results are presented here.
Harvey-Thompson AJ, Lebedev SV, Burdiak G, et al., 2011, Suppression of the Ablation Phase in Wire Array Z Pinches Using a Tailored Current Prepulse, PHYSICAL REVIEW LETTERS, Vol: 106, ISSN: 0031-9007
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- Citations: 40
Lebedev SV, Suzuki-Vidal F, Ciardi A, et al., 2011, Laboratory simulations of astrophysical jets, 274th Symposium of the International-Astronomical-Union on Advances in Plasma Astrophysics, Publisher: CAMBRIDGE UNIV PRESS, Pages: 26-35, ISSN: 1743-9213
Suzuki-Vidal F, Lebedev SV, Bland SN, et al., 2010, Generation of episodic magnetically driven plasma jets in a radial foil Z-pinch, PHYSICS OF PLASMAS, Vol: 17, ISSN: 1070-664X
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- Citations: 37
Ivanov VV, Astanovitskiy AL, Papp D, et al., 2010, Study of transparent and nontransparent regimes of implosion in star wire arrays, PHYSICS OF PLASMAS, Vol: 17, ISSN: 1070-664X
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- Citations: 11
Ampleford DJ, Jennings CA, Hall GN, et al., 2010, Bow shocks in ablated plasma streams for nested wire array z-pinches: A laboratory astrophysics testbed for radiatively cooled shocks, 51st Annual Meeting of the Division-of-Plasma-Physics of the American-Physics-Society, Publisher: AIP Publishing, ISSN: 1070-664X
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- Citations: 15
Suzuki-Vidal F, Lebedev SV, Bland SN, et al., 2010, Effect of Wire Diameter and Addition of an Axial Magnetic Field on the Dynamics of Radial Wire Array <i>Z</i>-Pinches, 51st American-Physics-Society-Division-of-Plasma-Physics Meeting, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 581-588, ISSN: 0093-3813
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- Citations: 21
Suzuki-Vidal F, Lebedev SV, Ciardi A, et al., 2010, Magnetically Driven Supersonic Plasma Jets in High Energy Density Experiments, International Symposium Plasmas in the Laboratory and in the Universe: Interactions, Patterns and Turbulence, Publisher: AMER INST PHYSICS, Pages: 266-+, ISSN: 0094-243X
Mitchell MD, Chandler KM, Bland S, et al., 2009, Current rise-rate scaling for radial wire arrays, ISSN: 0730-9244
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
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