Using pulsed power for hydrodynamic code verification and validation

Kanzleiter, R.; Atchison, W.L.; Bowers, R.L.; Gittings, M. L.; Guzik, Joyce A.; Oró, D.; Roberts, J. P.; Rodriguez, George; Stokes, John; Turchi, P. J.; Coffey, S.K.; Kiuttu, D.G.

doi:10.1109/ppps.2001.961155

Cited by 3 publications

(3 citation statements)

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“…Although the nominal Shiva Star capacitor bank charge voltage was 80 kV, changes of only a few percent in the peak current can cause several hundreds of nanoseconds shifts in the impact and convergence times. Therefore, any detailed shot-to-shot comparison of the data requires a full analysis of the action of the current on liner acceleration and liner-target hydrodynamics [2]. From the NTLX1 and NTLX3 data in Figure 5, an average radial shock velocity is calculated by taking the average radius of each elliptic fit from both of these experimental shots.…”

Section: Resultsmentioning

confidence: 99%

“…Experimental characterization of a converging shockwave in a cylindrical geometry provides fundamental benchmarks used in the modeling of 1-D and 2-D hydrodynamic phenomena from high or solid density implosions [1,2]. A high-speed laser shadowgraphy system for detailed imaging of a convergent cylindrical shockwave provides diagnosis where multiple sampling of the shock front position and radial shape are desired.…”

Section: Introductionmentioning

confidence: 99%

“…Labeled the Near Term Liner Experiments (NTLX), an experimental series of four shots were conducted at the Air Force Research Laboratory's Shiva Star 1300-µf capacitor bank z-pinch facility [2,4] in Albuquerque, NM for the High Energy Density Hydrodynamics Program at the Los Alamos National Laboratory. Since additional details on the Shiva Star NTLX cylindrical liner implosion experimental series can be found in other papers from these conference proceedings [4,5,6], we describe only brief details of the NTLX experimental series performance parameters.…”

Section: Introductionmentioning

confidence: 99%

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Development and fielding of high-speed laser shadowgraphy for electro-magnetically driven cylindrical implosions

Rodriguez

Roberts

Taylor

et al.

PPPS-2001 Pulsed Power Plasma Science 2001. 28th IEEE International Conference on Plasma Science and 13th IEEE International Pu

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A laser shadowgraphy system for high-speed imaging of a convergent cylindrical shockwave generated by an electro-magnetically driven solid density liner implosion in Lucite is described. The laser shadowgraphy system utilizes an advanced high-energy, long-pulse, frequencydoubled Nd:YAG laser for target illumination and a fast framing camera for multiple frame imaging of the shockwave as it radially converges and transits the Lucite. The time window resolution is 10 ns as determined by the fastest exposure time capable with the camera. Two onaxis symmetric implosions and two off-axis antisymmetric implosion experiments were fielded at the Air Force Research Laboratory's Shiva Star 4.2 MJ capacitor bank z-pinch facility. For each experimental shot, the shadowgraphy system captured several frames of shadowgraph images as the shockwave moved through the Lucite. Analysis of the shockwave shadowgraph image shapes is done by fitting each shadowgraph image to a generic elliptical fit function and plotting the resultant 2-D image fits for comparison. For the on-axis symmetric implosion shots, a radial shock velocity is calculated. The Lucite shock speed is seen to increase monotonically from an initial velocity of 7.9 mm/µs to a near final velocity of 13.4 mm/µs as convergence effects dominate the shock speed calculated at small radii.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development and fielding of high-speed laser shadowgraphy for electro-magnetically driven cylindrical implosions

Rodriguez

Roberts

Taylor

et al.

PPPS-2001 Pulsed Power Plasma Science 2001. 28th IEEE International Conference on Plasma Science and 13th IEEE International Pu

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Pulsed Power Hydrodynamics: Atlas Results and Future Perspectives

Reinovsky

Atchison

Dimonte

et al. 2007

2007 IEEE 34th International Conference on Plasma Science (ICOPS)

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Pulsed Power Hydrodynamics (PPH) is a new application of low-impedance, pulsed power technology to the study of complex hydrodynamics, instabilities, turbulence, and material properties in a highly precise, controllable environment at the extremes of pressure and material velocity. The Atlas facility, designed and built by Los Alamos, is the world's first, and only, laboratory pulsed power system designed specifically to explore this relatively new family of pulsed power applications. Constructed in the year 2000 and commissioned in August 2001, Atlas is a 24-MJ high-performance capacitor bank delivering currents up to 30-Megamperes with a rise time of 5 to 6-µsec. The high-precision, cylindrically imploding liner is the tool most frequently used to convert electromagnetic energy into the hydrodynamic (particle kinetic) energy needed to drive strong shocks, quasi-isentropic compression, or large volume, adiabatic compression for the experiments. At typical parameters, a 30-gr, 1-mm-thick liner with an initial radius of 5-cm, and an intermediate current of 20-MA can be accelerated to 7.5-km/sec producing megabar shocks in medium density targets. Velocities up to 20km/sec and pressures >20-Mbar in high density targets are possible.

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