Increased kilo-electron-volt x-ray yields from<i>Z</i>-pinch plasmas by mixing elements of similar atomic numbers

Deeney, C.; LePell, P.D.; Failor, B. H.; Wong, S.; Apruzese, J. P.; Whitney, K. G.; Thornhill, J. W.; Davis, J.; Yadlowsky, E. J.; Hazelton, R. C.; Moschella, J.J.; Nash, T. J.; Loter, N.

doi:10.1103/physreve.51.4823

Cited by 54 publications

(35 citation statements)

References 12 publications

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“…One possible example of such a 3-D effect concerns the amount of plasma that is driven toward the axis in advance of the main body of the array plasma, which may be a function of the interwire gap. Such an early arrival of plasma is observed in these as well as in other 21,23 wire-array experiments.…”

Section: B Modeling the Wire-array Z Pinchmentioning

confidence: 77%

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Systematic trends in x-ray emission characteristics of variable-wire-number, fixed-mass, aluminum-array, Z-pinch implosions

et al. 1999

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Increasing the number of wires an order of magnitude from 10 to almost 200 while simultaneously fixing the total wire mass in annular aluminum-wire-array Z-pinch implosions on the 20 TW Saturn generator [Proceedings of the 6th International IEEE Pulsed Power Conference (Institute of Electrical and Electronics Engineers, Piscataway, NJ, 1987), p. 310] demonstrates two separate power-law trends in the measured x-ray characteristics as a function of the initial interwire gap (g). These trends are approximately independent of the array radius. When g decreases from ∼6 to 0.4 mm, the peak total radiated power increases by a factor of 20 and the total energy by a factor of 2. There is a more rapid increase in peak power and energy radiated as g decreases for gaps greater than ∼2 mm. This increase is related to a measured decrease in precursor plasma and to a calculated decreased sensitivity of the implosion to azimuthal asymmetries that occurs when individual wire plasmas begin to merge following their vaporization. The substantial increase in power arises from an inferred increase in plasma compression and can be correlated with an almost linear reduction in the calculated effective thickness of the plasma annulus near stagnation as g decreases.

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Section: B Modeling the Wire-array Z Pinchmentioning

confidence: 77%

“…This phenomenon is consistent with theory 22 and previous experiments. 23 Its presence increased the kilovolt x-ray losses from the pinch, which, in turn, led to a noticeable added increase in the pinch's density.…”

Section: Introductionmentioning

confidence: 98%

Systematic trends in x-ray emission characteristics of variable-wire-number, fixed-mass, aluminum-array, Z-pinch implosions

et al. 1999

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“…7 may serve as useful benchmarks for detailed magnetohydrodynamic ͑MHD͒ modeling of the shell-on-shell implosions. It has been previously demonstrated 12,13 for wire array implosions that the center of a Z pinch is at the highest temperature. Based on MHD models, we expect this result to also apply to gas puffs.…”

Section: Figmentioning

confidence: 98%

Initial results for an argon Z pinch using a double-shell gas puff

et al. 2000

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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.

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“…So we can use an alloyed wire-array with close atomic number elements to decrease the opacity effect and to increase the K-shell line emission [75,76]. In Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Theoretical and numerical research of wire array Z-pinch and dynamic hohlraum at IAPCM

Ding

Zhang

Xiao

et al. 2016

Matter and Radiation at Extremes

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Dense Z-pinch plasmas are powerful and energy-efficient laboratory sources of x rays, and show the possibility to drive inertial confinement fusion (ICF). Recent advances in wire-array Z-pinch and Z-pinch dynamic hohlraum (ZPDH) researches at the Institute of Applied Physics and Computational Mathematics are presented in this paper. Models are setup to study different physical processes. A full circuit model (FCM) was used to study the coupling between Z-pinch implosion and generator discharge. A mass injection model with azimuthal modulation was setup to simulate the wire-array plasma initiation, and the two-dimensional MHD code MARED was developed to investigate the Z-pinch implosion, MRT instability, stagnation and radiation. Implosions of nested and quasispherical wire array were also investigated theoretically and numerically. Key processes of ZPDH, such as the array-foam interaction, formation of the hohlraum radiation, as well as the following capsule ablation and implosion, were analyzed with different radiation magneto-hydrodynamics (RMHD) codes. An integrated 2D RMHD simulation of dynamic hohlraum driven capsule implosion provides us the physical insights of wire-array plasma acceleration, shock generation and propagation, hohlraum formation, radiation ablation, and fuel compression.

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Increased kilo-electron-volt x-ray yields fromZ-pinch plasmas by mixing elements of similar atomic numbers

Cited by 54 publications

References 12 publications

Systematic trends in x-ray emission characteristics of variable-wire-number, fixed-mass, aluminum-array, Z-pinch implosions

Systematic trends in x-ray emission characteristics of variable-wire-number, fixed-mass, aluminum-array, Z-pinch implosions

Initial results for an argon Z pinch using a double-shell gas puff

Theoretical and numerical research of wire array Z-pinch and dynamic hohlraum at IAPCM

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