Obtaining of enhanced magnetic energies with nanosecond energy release times on a pulse-power generator
Proposed for publication in Applied Physics Letters.
Abstract not provided.
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Jump to search filtersWire array Z-pinch experiments on the refurbished Z machine
Abstract not provided.
Bright spots in 1 MA X pinches as a function of wire number and material
Proposed for publication in Physics of Plasmas.
Bright, intense x-ray sources with extreme plasma parameters (micropinch plasmas) have previously been characterized at 0.1-0.4 MA, but the scaling of such sources at higher current is poorly understood. The x-ray source size and radiation power of 1 MA X pinches were studied as a function of wire material (Al, Ti, Mo, and W) and number (1-, 2-, 8-, 32-, and 64-wire configurations). The smallest bright spots observed were from 32-wire tungsten X pinches, which produced {le} 11-16 {micro}m, {approx}2 J, 1-10 GW sources of 3-5 keV radiation.
Planar wire array dynamics and radiation scaling at multi-MA levels on the Saturn pulsed power generator
Planar wire arrays are studied at 3-6 MA on the Saturn pulsed power generator as potential drivers of compact hohlraums for inertial confinement fusion studies. Comparison with zero-dimensional modeling suggests that there is significant trailing mass. The modeled energy coupled from the generator cannot generally explain the energy in the main x-ray pulse. Preliminary comparison at 1-6 MA indicates sub-quadratic scaling of x-ray power in a manner similar to compact cylindrical wire arrays. Time-resolved pinhole images are used to study the implosion dynamics.
On the validation of a 3D inflow model for simulating wire array Z-pinches, Z-pinch energetics, and scaling of radiated power with current
Abstract not provided.
Lower bounds for the kinetic energy and resistance of wire array Z pinches on the Z pulsed-power accelerator
Physics of Plasmas
Approximate lower bounds for the kinetic energy and magnetic flux dissipation for tungsten wire arrays on the Z pulsed-power accelerator at Sandia National Laboratories [R. B. Spielman, Phys. Plasmas 5, 2105 (1998)] are obtained. A procedure, extending previous work determining pinch inductance as a function of time [E. M. Waisman, Phys. Plasmas 11, 2009 (2004)], is introduced and applied to electrical and x-ray energy measurements. It employs the pinch energy balance to determine lower bounds for the plasma kinetic energy just before the main pinch reaches the axis and for the magnetic flux dissipation during stagnation. From the lower bound for the dissipated flux, a lower bound for pinch resistance after x-ray peak power is estimated. The results of applying the introduced energy balance procedure to selected tungsten wire array implosions on Z are given. It is believed that this is the first time that a measure of wire array Z-pinch resistance at stagnation is obtained purely from data analysis without recourse to specific assumptions on the plasma motion. © 2008 American Institute of Physics.
Load Current Multiplier Development at Reno and Sandia
Abstract not provided.
Lower Bounds for the Kinetic Energy and Resistance of Z-pinches on Z (ZR)
Abstract not provided.
Experimental Studies of Implosion Characteristics and Radiation Properties of Planar and Cylindrical Wire Arrays and X-pinches
Abstract not provided.
Commissioning of Z-pinch X-ray Energy Power Spectrum and Imaging Diagnostics on the Upgraded Z Facility
Abstract not provided.
Micropinch formation in 1 MA X pinches as a function of wire number and material
Physics of Plasmas
Abstract not provided.
Fill-Tube-Induced Mass Perturbations on X-Ray-Driven, Ignition-Scale, Inertial-Confinement-Fusion Capsule Shells and the Implications for Ignition Experiments
Physical Review Letters
We present on the first inertial-confinement-fusion ignition facility, the target capsule will be DT filled through a long, narrow tube inserted into the shell. μg-scale shell perturbations Δm' arising from multiple, 10–50 μm-diameter, hollow SiO2 tubes on x-ray-driven, ignition-scale, 1-mg capsules have been measured on a subignition device. Finally, simulations compare well with observation, whence it is corroborated that Δm' arises from early x-ray shadowing by the tube rather than tube mass coupling to the shell, and inferred that 10–20 μm tubes will negligibly affect fusion yield on a full-ignition facility.
Validation of an Ablation Model for Simulating Wire Array Z-Pinches
Abstract not provided.
Tradeoffs of efficiency and symmetry control for z-pinch driven ICF hohlraums
Abstract not provided.
Three dimensional effects in trailing mass in the wire-array Z pinch
Abstract not provided.
Radiation energetics of inertial confinement fusion relevant wire arrays on Z
Abstract not provided.
Measurement of Doppler implosion velocity in wire array z pinches
Abstract not provided.
Faster 80ns current scaling experiments yield higher radiated x-ray power and come closer to quadratic dependence
Abstract not provided.
Bounds for Kinetic Energy and Resistance for W wire array implosions on Z
Abstract not provided.
K-Shell X-Ray Generation on Sandia's Refurbished Z Machine for the Radiation Effects Sciences Program
Abstract not provided.
Mode-selective shields as a target design technique for radiation symmetry control in hohlraums
Abstract not provided.
Pulsed Power ICF and High-Energy-Density Science Programs at Sandia National Laboratories
Abstract not provided.
Determination of implosion dynamics and plasma energetics in Z pinches
Abstract not provided.
Faster 80ns current scaling experiments yield higher radiated x-ray power and approach quadratic dependence
Physical Review E
Abstract not provided.
Pulse Shaping Techniques with Nested Wire Arrays (and Applications of Novel Wire Arrays)
Abstract not provided.
Results 301–325 of 394