Wire number doubling in high-wire-number regime increases Z-accelerator X-ray power

Sanford, T.W.L.; Spielman, R. B.; Allshouse, G.O.; Chandler, G. A.; Fehl, D. L.; Stygar, W. A.; Struve, K. W.; Deeney, C.; Nash, T. J.; Seamen, J. F.; Mock, R. C.; Gilliland, T. L.; McGurn, J.; Jobe, D.

doi:10.1109/27.725136

Cited by 46 publications

(25 citation statements)

References 12 publications

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“…1lB) occurs. The variation observed is qualitatively similar to that recently measured on Z [5,37], for tungsten-wire arrays, using 120 wires at a radius of 20 mm (Fig. 1lC and 11D).…”

Section: A Measurementssupporting

confidence: 77%

“…This variation is nicely illustrated when the number of wires is doubled from 120 to 240 on Z, for the small-radius geometry using tungsten wires [37]. On Z the total radiated power increased by (45*22)% and the pulsewidth decreased by (2%k9)%, in agreement with the 41% change expected from the model.…”

supporting

confidence: 73%

“…The difference arises from the approximate resistivity model used in the 1-D simulations [37]. Figure 5A also shows the line-integrated mass-density profile for a 13-pm diameter aluminum wire measured under these same end-of-prepulse conditions using the Cornell x-pinch backlighting source [20].…”

Section: Mh2d and Mh3d Simulationsmentioning

confidence: 99%

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Wire array Z-pinch insights for enhanced x-ray production

et al. 1999

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Comparisons of measured total radiated x-ray power from annular wire-array z-pinches with a variety of models as a function of wire number, array mass, and load radius are reviewed. The data, which are comprehensive, have provided important insights into the features of wire-array dynamics that are critical for high x-ray power generation. Collectively, the comparisons of the data with the model calculations suggest that a number of underlying dynamical mechanisms involving cylindrical asymmetries and plasma instabilities contribute to the measured characteristics. For example, under the general assumption that the measured risetime of the total-radiated-power pulse is related to the thickness of the plasma shell formed on axis, the Heuristic Model [IEEE Trans. Plasma Sci. 26, 1275 (1998)] agrees with the measured risetime under a number of specific assumptions about the way the breakdown of the wires, the wire-plasma expansion, and the Rayleigh–Taylor instability in the r–z plane, develop. Likewise, in the high wire-number regime (where the wires are calculated to form a plasma shell prior to significant radial motion of the shell) the comparisons show that the variation in the power of the radiation generated as a function of load mass and array radius can be simulated by the two-dimensional Eulerian-radiation- magnetohydrodynamics code (E-RMHC) [Phys. Plasmas 3, 368 (1996)], using a single random-density perturbation that seeds the Rayleigh–Taylor instability in the r–z plane. For a given pulse-power generator, the comparisons suggest that (1) the smallest interwire gaps compatible with practical load construction and (2) the minimum implosion time consistent with the optimum required energy coupling of the generator to the load should produce the highest total-radiated-power levels.

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“…1lB) occurs. The variation observed is qualitatively similar to that recently measured on Z [5,37], for tungsten-wire arrays, using 120 wires at a radius of 20 mm (Fig. 1lC and 11D).…”

Section: A Measurementssupporting

confidence: 77%

supporting

confidence: 73%

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Wire array Z-pinch insights for enhanced x-ray production

et al. 1999

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“…2B) was used in the optimization. Additionally because power has been shown to depend on wire number [19][20][34][35], for each diameter, wire number changes were kept within about ± 15 % of the mean number of wires used (Table I). The shot sequence was motivated by 1D resistive-MHD simulations [33] that suggested the axial power could be increased by reducing the load diameter, as illustrated by Fig.…”

Section: Outer Array Optimizationmentioning

confidence: 99%

“…Implicit in these applications is the assumption that the axial radiation produced is top-bottom symmetric [18]. Sandia's initial DH configuration was developed by Nash and colleagues [3], after it was established that a high x-ray power could be generated by a wire-array z-pinch if a large number of wires were used in the array [19][20].…”

Section: Introductionmentioning

confidence: 99%

Overview of the dynamic-hohlraum x-ray source at Sandia National Laboratories.

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2007

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Progress in understanding the physics of Dynamic-Hohlraums is reviewed for a system capable of generating 10 TW of axial radiation for high temperature (>200 eV) radiation-flow experiments and ICF capsule implosions. 2D magneto-hydrodynamic simulation comparisons with data show the need to include wire initiation physics and subsequent discrete wire dynamics in the simulations if a predictive capability is to be achieved.

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Dynamics of the wire array implosion

et al. 2000

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The tungsten wire liner is accelerated to the Al wire of 120 mm in diameter located in the axis of the array liner at 3 MA maximum current. The pinch phase was studied by the streak and pinhole cameras, spectrograph, x-ray and visual frame and schlieren diagnostics. The spectral, temporal and spatial resolving records confirmed only a small stabilizing role of the wire in the pinched phase of the implosion.

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Wire number doubling in high-wire-number regime increases Z-accelerator X-ray power

Cited by 46 publications

References 12 publications

Wire array Z-pinch insights for enhanced x-ray production

Wire array Z-pinch insights for enhanced x-ray production

Overview of the dynamic-hohlraum x-ray source at Sandia National Laboratories.

Dynamics of the wire array implosion

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