101 results found
Hare JD, Suttle LG, Lebedev SV, et al., 2018, An experimental platform for pulsed-power driven magnetic reconnection, Physics of Plasmas, Vol: 25, ISSN: 1070-664X
© 2018 Author(s). We describe a versatile pulsed-power driven platform for magnetic reconnection experiments, based on the exploding wire arrays driven in parallel [Suttle et al., Phys. Rev. Lett. 116, 225001 (2016)]. This platform produces inherently magnetised plasma flows for the duration of the generator current pulse (250 ns), resulting in a long-lasting reconnection layer. The layer exists for long enough to allow the evolution of complex processes such as plasmoid formation and movement to be diagnosed by a suite of high spatial and temporal resolution laser-based diagnostics. We can access a wide range of magnetic reconnection regimes by changing the wire material or moving the electrodes inside the wire arrays. We present results with aluminium and carbon wires, in which the parameters of the inflows and the layer that forms are significantly different. By moving the electrodes inside the wire arrays, we change how strongly the inflows are driven. This enables us to study both symmetric reconnection in a range of different regimes and asymmetric reconnection.
Santos JJ, Bailly-Grandvaux M, Ehret M, et al., 2018, Laser-driven strong magnetostatic fields with applications to charged beam transport and magnetized high energy-density physics, Physics of Plasmas, Vol: 25, ISSN: 1070-664X
© 2018 EURATOM. Powerful nanosecond laser-plasma processes are explored to generate discharge currents of a few 100 kA in coil targets, yielding magnetostatic fields (B-fields) in excess of 0.5 kT. The quasi-static currents are provided from hot electron ejection from the laser-irradiated surface. According to our model, which describes the evolution of the discharge current, the major control parameter is the laser irradiance Ilasλlas2. The space-time evolution of the B-fields is experimentally characterized by high-frequency bandwidth B-dot probes and proton-deflectometry measurements. The magnetic pulses, of ns-scale, are long enough to magnetize secondary targets through resistive diffusion. We applied it in experiments of laser-generated relativistic electron transport through solid dielectric targets, yielding an unprecedented 5-fold enhancement of the energy-density flux at 60 μm depth, compared to unmagnetized transport conditions. These studies pave the ground for magnetized high-energy density physics investigations, related to laser-generated secondary sources of radiation and/or high-energy particles and their transport, to high-gain fusion energy schemes, and to laboratory astrophysics.
Suttle LG, Hare JD, Lebedev SV, et al., 2018, Ion heating and magnetic flux pile-up in a magnetic reconnection experiment with super-Alfvenic plasma inflows, PHYSICS OF PLASMAS, Vol: 25, ISSN: 1070-664X
Burdiak GC, Lebedev SV, Bland SN, et al., 2017, The structure of bow shocks formed by the interaction of pulsed-power driven magnetised plasma flows with conducting obstacles, PHYSICS OF PLASMAS, Vol: 24, ISSN: 1070-664X
Clayson T, Suzuki-Vidal F, Lebedev SV, et al., 2017, Counter-propagating radiative shock experiments on the Orion laser and the formation of radiative precursors, High Energy Density Physics, Vol: 23, Pages: 60-72, ISSN: 1878-0563
We present results from new experiments to study the dynamics of radiative shocks, reverse shocks and radiative precursors. Laser ablation of a solid piston by the Orion high-power laser at AWE Aldermaston UK was used to drive radiative shocks into a gas cell initially pressurised between 0.1 and 1.0 bar with different noble gases. Shocks propagated at 80 ± 10 km/s and experienced strong radiative cooling resulting in post-shock compressions of ×25 ± 2. A combination of X-ray backlighting, optical self-emission streak imaging and interferometry (multi-frame and streak imaging) were used to simultaneously study both the shock front and the radiative precursor. These experiments present a new configuration to produce counter-propagating radiative shocks, allowing for the study of reverse shocks and providing a unique platform for numerical validation. In addition, the radiative shocks were able to expand freely into a large gas volume without being confined by the walls of the gas cell. This allows for 3-D effects of the shocks to be studied which, in principle, could lead to a more direct comparison to astrophysical phenomena. By maintaining a constant mass density between different gas fills the shocks evolved with similar hydrodynamics but the radiative precursor was found to extend significantly further in higher atomic number gases (∼4 times further in xenon than neon). Finally, 1-D and 2-D radiative-hydrodynamic simulations are presented showing good agreement with the experimental data.
Espinosa G, Rodriguez R, Gil JM, et al., 2017, Influence of atomic kinetics in the simulation of plasma microscopic properties and thermal instabilities for radiative bow shock experiments, PHYSICAL REVIEW E, Vol: 95, ISSN: 2470-0045
Hare JD, Lebedev SV, Suttle LG, et al., 2017, Formation and structure of a current sheet in pulsed-power driven magnetic reconnection experiments, PHYSICS OF PLASMAS, Vol: 24, ISSN: 1070-664X
Hare JD, Suttle L, Lebedev SV, et al., 2017, Anomalous Heating and Plasmoid Formation in a Driven Magnetic Reconnection Experiment, PHYSICAL REVIEW LETTERS, Vol: 118, ISSN: 0031-9007
Singh RL, Stehle C, Suzuki-Vidal F, et al., 2017, Experimental study of the interaction of two laser-driven radiative shocks at the PALS laser, HIGH ENERGY DENSITY PHYSICS, Vol: 23, Pages: 20-30, ISSN: 1574-1818
Spindloe C, Wyatt D, Astbury S, et al., 2017, Design and fabrication of gas cell targets for laboratory astrophysics experiments on the Orion high-power laser facility, HIGH POWER LASER SCIENCE AND ENGINEERING, Vol: 5, ISSN: 2095-4719
Suzuki Vidal F, Clayson T, Swadling GF, et al., 2017, Counter-propagating radiative shock experiments on the Orion laser, Physical Review Letters, Vol: 119, ISSN: 1079-7114
We present new experiments to study the formation of radiative shocks and theinteraction between two counter-propagating radiative shocks. The experimentswere performed at the Orion laser facility which was used to drive shocks inxenon inside large aspect ratio gas-cells. The collision between the two shocksand their respective radiative precursors, combined with the formation ofinherently 3-dimensional shocks, provides a novel platform particularly suitedfor benchmarking of numerical codes. The dynamics of the shocks before andafter the collision were investigated using point-projection X-ray backlightingwhile, simultaneously, the electron density in the radiative precursor wasmeasured via optical laser interferometry. Modelling of the experiments usingthe 2-D radiation hydrodynamic codes NYM/PETRA show a very good agreement withthe experimental results.
Burdiak GC, Lebedev SV, Clayson T, et al., 2016, LABORATORY ASTROPHYSICS WITH SUPERSONIC MAGNETISED PLASMAS: EXPERIMENTS ON THE MAGPIE PULSED-POWER FACILITY, 43rd IEEE International Conference on Plasma Science (ICOPS), Publisher: IEEE
Burdiak GC, Lebedev SV, Clayson T, et al., 2016, THE EFFECT OF MAGNETIC FIELD ORIENTATION ON THE STRUCTURE AND INTERACTION OF MAGNETISED BOW SHOCKS IN PULSED-POWER DRIVEN EXPERIMENTS, 43rd IEEE International Conference on Plasma Science (ICOPS), Publisher: IEEE
Haerendel G, Suttle L, Lebedev SV, et al., 2016, Stop layer: a flow braking mechanism in space and support from a lab experiment, PLASMA PHYSICS AND CONTROLLED FUSION, Vol: 58, ISSN: 0741-3335
Suttle LG, Hare JD, Lebedev SV, et al., 2016, Structure of a Magnetic Flux Annihilation Layer Formed by the Collision of Supersonic, Magnetized Plasma Flows, PHYSICAL REVIEW LETTERS, Vol: 116, ISSN: 0031-9007
Swadling GF, Lebedev SV, Hall GN, et al., 2016, Experimental investigations of ablation stream interaction dynamics in tungsten wire arrays: Interpenetration, magnetic field advection, and ion deflection, PHYSICS OF PLASMAS, Vol: 23, ISSN: 1070-664X
Ampleford DJ, Bland SN, Jennings CA, et al., 2015, Investigating Radial Wire Array Z-Pinches as a Compact X-Ray Source on the Saturn Generator, IEEE TRANSACTIONS ON PLASMA SCIENCE, Vol: 43, Pages: 3344-3352, ISSN: 0093-3813
Bennett MJ, Lebedev SV, Hall GN, et al., 2015, Formation of radiatively cooled, supersonically rotating, plasma flows in Z-pinch experiments: Towards the development of an experimental platform to study accretion disk physics in the laboratory, HIGH ENERGY DENSITY PHYSICS, Vol: 17, Pages: 63-67, ISSN: 1574-1818
Burdiak GC, Lebedev SV, Bland S, et al., 2015, Radiative precursors driven by converging blast waves in noble gases
Burdiak GC, Lebedev SV, Harvey-Thompson AJ, et al., 2015, Characterisation of the current switch mechanism in two-stage wire array Z-pinches, PHYSICS OF PLASMAS, Vol: 22, ISSN: 1070-664X
Burdiak GC, Lebedev SV, Suzuki-Vidal F, et al., 2015, Cylindrical liner Z-pinch experiments for fusion research and high-energy-density physics, JOURNAL OF PLASMA PHYSICS, Vol: 81, ISSN: 0022-3778
Cotelo M, Velarde P, de la Varga AG, et al., 2015, Simulation of radiative shock waves in Xe of last PALS experiments, HIGH ENERGY DENSITY PHYSICS, Vol: 17, Pages: 68-73, ISSN: 1574-1818
Espinosa G, Gil JM, Rodriguez R, et al., 2015, Collisional-radiative simulations of a supersonic and radiatively cooled aluminum plasma jet, HIGH ENERGY DENSITY PHYSICS, Vol: 17, Pages: 74-84, ISSN: 1574-1818
Hare JD, Lebedev SV, Bennett M, et al., 2015, Photo-ionisation of gas by x-rays from a wire array z-pinch
Larour J, Singh RL, Stehle C, et al., 2015, Optimization of an electromagnetic generator for strong shocks in low pressure gas, HIGH ENERGY DENSITY PHYSICS, Vol: 17, Pages: 129-134, ISSN: 1574-1818
Rodriguez R, Espinosa G, Gil JM, et al., 2015, Microscopic properties of xenon plasmas for density and temperature regimes of laboratory astrophysics experiments on radiative shocks, PHYSICAL REVIEW E, Vol: 91, ISSN: 2470-0045
Suzuki-Vidal F, 2015, PLASMA PHYSICS How to spark a field, NATURE PHYSICS, Vol: 11, Pages: 98-99, ISSN: 1745-2473
Suzuki-Vidal F, Lebedev SV, Ciardi A, et al., 2015, BOW SHOCK FRAGMENTATION DRIVEN BY A THERMAL INSTABILITY IN LABORATORY ASTROPHYSICS EXPERIMENTS, ASTROPHYSICAL JOURNAL, Vol: 815, ISSN: 0004-637X
Swadling GF, Hall GN, Lebedev SV, et al., 2015, Commissioning of a Rotated Wire Array Configuration for Improved Diagnostic Access, IEEE TRANSACTIONS ON PLASMA SCIENCE, Vol: 43, Pages: 2503-2508, ISSN: 0093-3813
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