Properties of a planar wire arrays Z-pinch source and comparisons with cylindrical arrays

Kantsyrev, V.L.; Rudakov, L. I.; Safronova, A.S.; Velikovich, A. L.; Иванов, В. В.; Coverdale, C. A.; LePell, P.D.; Ampleford, D. J.; Deeney, C.; Chuvatin, A. S.; Williamson, K.; Shrestha, I.; Ouart, N.; Yilmaz, M.F.; Osborne, G. C.; Haboub, A.; Batie, S.; Astanovitsky, A.; LeGalloudec, B.; Nalajala, V.; McDaniel, W.C.; Shlyaptseva, V. V.; Adkins, T.; Meyer, Chr.

doi:10.1016/j.hedp.2007.02.009

Cited by 34 publications

(33 citation statements)

References 19 publications

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“…This allowed for a more direct comparison with Zebra data [8], and at implosion times directly relevant to the Z machine. However, this is shorter than the natural rise time of the Saturn generator in this mode, and so the arrays were imploding when the load current had reached only ∼3 MA.…”

Section: Chapter 2 Compact Wire Array Experiments Designmentioning

confidence: 99%

“…This path requires advanced wire array development in order to achieve suitably high x-ray power from a compact load. In this report, we discuss experiments studying planar [8] and small-diameter cylindrical wire arrays [9] as candidates for a compact soft x-ray source.…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

“…Experiments on the 1 MA Zebra generator [10] at the University of Nevada, Reno, produced implosions with < 10 ns x-ray rise times and powers as high as 0.34 TW/cm, comparable to the most powerful cylindrical wire array implosions studied at that facility [8]. This behavior is surprising, as the standard intuition regarding cylindrical arrays is that high implosion velocity and a radially narrow plasma shell are required to achieve a fast rising and high power x-ray pulse.…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

“…Previous publications have also discussed the possibility of enhanced Ohmic heating due to Hall resistivity effects in wire array z pinches, suggesting that the effect might be exaggerated and thus more clearly observable in planar arrays versus cylindrical arrays due to a smaller amount of coupled kinetic energy in the planar array case [15,8]. Numerical modeling of wire arrays with a three-dimensional (3D) magnetohydrodynamic (MHD) code has indicated that resistive heating can play a role in cylindrical wire array energy deposition, but this contribution has been thought to be strongest and dominant only after the main x-ray peak [16].…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

“…1.1(a). Initial studies of 6 mm diameter Al wire arrays at 1 MA on the Zebra generator indicated comparable performance to planar Al arrays and higher x-ray power and yield than for 8-16 mm diameter Al cylindrical arrays [8]. A recent systematic study of cylindrical arrays from 1-16 mm diameter on Zebra indicates highest achievable x-ray power for 3-8 mm array diameters [9].…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

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Compact wire array sources: power scaling and implosion physics.

Serrano¹,

Chuvatin

Jones³

et al. 2008

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A series of ten shots were performed on the Saturn generator in short pulse mode in order to study planar and small-diameter cylindrical tungsten wire arrays at ∼5 MA current levels and 50-60 ns implosion times as candidates for compact z-pinch radiation sources. A new vacuum hohlraum configuration has been proposed in which multiple z pinches are driven in parallel by a pulsed power generator. Each pinch resides in a separate return current cage, serving also as a primary hohlraum. A collection of such radiation sources surround a compact secondary hohlraum, which may potentially provide an attractive Planckian radiation source or house an inertial confinement fusion fuel capsule. Prior to studying this concept experimentally or numerically, advanced compact wire array loads must be developed and their scaling behavior understood. The 2008 Saturn planar array experiments extend the data set presented in Ref.[1], which studied planar arrays at ∼3 MA, 100 ns in Saturn long pulse mode. Planar wire array power and yield scaling studies now include current levels directly applicable to multi-pinch experiments that could be performed on the 25 MA Z machine. A maximum total x-ray power of 15 TW (250 kJ in the main pulse, 330 kJ total yield) was observed with a 12-mm-wide planar array at 5.3 MA, 52 ns. The full data set indicates power scaling that is sub-quadratic with load current, while total and main pulse yields are closer to quadratic; these trends are similar to observations of compact cylindrical tungsten arrays on Z. We continue the investigation of energy coupling in these short pulse Saturn experiments using zero-dimensional-type implosion modeling and pinhole imaging, indicating 16 cm/μs implosion velocity in a 12-mm-wide array. The same phenomena of significant trailing mass and evidence for resistive heating are observed at 5 MA as at 3 MA. 17 kJ of Al K-shell radiation was obtained in one Al planar array fielded at 5.5 MA, 57 ns and we compare this to cylindrical array results in the context of a K-shell yield scaling model. We have also performed an initial study of compact 3 mm diameter cylindrical wire arrays, which are alternate candidates for a multi-pinch vacuum hohlraum concept. These massive 3.4 and 6 mg/cm loads may have been impacted by opacity, producing a maximum x-ray power of 7 TW at 4.5 MA, 45 ns. Future research directions in compact x-ray sources are discussed. 4 AcknowledgmentWe thank M. Lopez (1675), G. T. Liefeste (1675), and J. L. Porter (1670) for providing load hardware and diagnostic support; L.B. Nielsen-Weber (1675) and D.S. Nielsen (1675) for extensive support of diagnostic installation, fielding, and film processing;

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Section: Chapter 2 Compact Wire Array Experiments Designmentioning

confidence: 99%

Section: Chapter 1 Introductionmentioning

confidence: 99%