Topic
Double eagle
About: Double eagle is a research topic. Over the lifetime, 21 publications have been published within this topic receiving 133 citations.
Papers
TL;DR: The data support the existence of a reasonably well defined region in (load mass)--(implosion velocity) space in which plasma kinetic energy is efficiently converted into [ital K]-shell x rays and are in fairly good quantitative agreement with an earlier scaling law prediction of the maximum x-ray yield from aluminum.
Abstract: Two sets of [ital z]-pinch experiments were recently completed at the Saturn and Phoenix facilities of Sandia National Laboratories and the Naval Surface Warfare Center, respectively, using aluminum wire arrays of different wire and array diameters. Measurements of the total x-ray yield from the [ital K] shell of aluminum were made. In this paper, a comparison of these measurements is made to both theoretical predictions and to a similar set of earlier measurements that were made at the Double Eagle facility of Physics International Company. These three sets of yield measurements have points of agreement with predicted yields and with each other, but they also show points of mutual disagreement, whose significance is discussed. The data are analyzed using a slightly revised version of a previously published [ital K]-shell yield scaling law, and they support the existence of a reasonably well defined region in (load mass)--(implosion velocity) space in which plasma kinetic energy is efficiently converted into [ital K]-shell x rays. Furthermore, a correlation is observed between the inferred conversion efficiencies and the times in which the implosions occur relative to the times when each generator's short-circuit current reaches its peak value. Finally, unlike the Double Eagle experiments, the largestmore » measured yields in the new experiments were observed to occur at the upper velocity boundary of the efficient emission region. Moreover, the observed yields are in fairly good quantitative agreement with an earlier scaling law prediction of the maximum [ital K]-shell x-ray yield from aluminum as a function of load mass assuming kinetic energy conversion alone.« less
47 citations
TL;DR: Frazier et al. as mentioned in this paper showed that the mass initially closest to the axis is the dominant contributor to the hot core of the radiating pinch and used a tracer to selectively seed the inner or outer gas plenums with a chlorine tracer.
Abstract: Recent observations are given for an argon double-shell gas puff imploded with up to 4 MA in 200 ns on the Double Eagle generator [G. B. Frazier et al., Digest of Technical Papers, Fourth IEEE Pulsed Power Conference (IEEE, Piscataway, NJ, 1983), p. 583]. Good K-shell x-ray output with good pinch quality was observed. A novel experimental procedure was used to selectively seed the inner or outer gas plenums with a chlorine tracer. The tracer data provide the first direct experimental evidence that the mass initially closest to the axis is the dominant contributor to the hot core of the radiating pinch.
44 citations
TL;DR: In this article, high-sensitivity interferometry measurements of initial density distributions are reviewed for a wide range of gas-puff nozzles used in plasma radiation source (PRS) z-pinch experiments.
Abstract: High-sensitivity interferometry measurements of initial density distributions are reviewed for a wide range of gas-puff nozzles used in plasma radiation source (PRS) z-pinch experiments. Accurate gas distributions are required for determining experimental load parameters, modeling implosion dynamics, understanding the radiation properties of the stagnated pinch, and for predicting PRS performance in future experiments. For a number of these nozzles, a simple ballistic-gas-flow model (BFM) has been used to provide good physics-based analytic fits to the measured r, z density distributions. These BFM fits provide a convenient means to smoothly interpolate radial density distributions between discrete axial measurement locations for finer-zoned two-dimensional MHD calculations, and can be used to determine how changes in nozzle parameters and load geometry might alter implosion dynamics and radiation performance. These measurement and analysis techniques are demonstrated for a nested-shell nozzle used in Double Eagle and Saturn experiments. For this nozzle, the analysis suggests load modifications that may increase the K-shell yield.
15 citations
TL;DR: In this paper, a series of aluminum wire array implosions with nearly equal line density have been performed on the Double Eagle pulse power generator, and the measured implosion times, minimum radii, total radiative yields, K-shell yields, and k-shell pulse widths are compared against radiation-hydromagnetic simulations.
Abstract: A series of aluminum wire array implosions with nearly equal line density have been performed on the DOUBLE EAGLE pulse power generator. The measured implosion times, minimum radii, total radiative yields, K-shell yields, and K-shell pulse widths are compared against radiation-hydromagnetic simulations. The simulations treat the plasma as a uniform shell of finite thickness and include a circuit model for the generator. A short circuit and an enhanced resistivity are added to the simulation models in order to improve the agreement with experimental data. In general the final results are encouraging, but indicate that the present state of simulations is short of providing an accurate predictive capability.
15 citations
TL;DR: In this article, a technique to extrude pure sodium wires has been developed and this has allowed the implosion of sodium wire arrays on the 4 MA, 6 TW Double Eagle generator.
Abstract: A technique to extrude pure sodium wires has been developed and this has allowed the implosion of sodium wire arrays on the 4 MA, 6 TW Double Eagle generator. A maximum K‐shell x‐ray yield of 35 kJ was achieved. Of particular interest, as regards the sodium‐neon x‐ray laser scheme, is the measured 150 GW, 8 kJ in the NaX 1s2–1s2p 1P line at 11.0027 A.
8 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2005 | 1 |
| 2004 | 1 |
| 2003 | 1 |
| 2002 | 3 |
| 2001 | 2 |
| 2000 | 2 |