X-ray pulse shaping in experiments with planar wire arrays at the 1.6 MA Zebra generator

Kantsyrev, V.L.; Safronova, A.S.; Esaulov, A. A.; Williamson, K.; Shrestha, I.; Osborne, G. C.; Weller, M. E.; Yilmaz, M.F.; Ouart, N.; Shlyaptseva, V. V.; Velikovich, A. L.; Rudakov, L. I.

doi:10.1088/1742-6596/244/3/032030

Cited by 7 publications

(12 citation statements)

References 5 publications

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“…Highest T e was obtained for DPWA sources (for example, T e 400 eV from Cu L-shell spectra obtained with x-ray spectrometer). Also, DPWA sources were used due to much better pulse shaping properties than SPWAs [6,15]. The average peak power in > 0.2 keV region of W sources in each cavity was found to be P DPWA = 0.65 TW.…”

Section: Demonstration Of Equally Redistributed Currents and The Syncmentioning

confidence: 99%

“…PWA turned out to be an effective radiator [2][3][4]. Compact, mm-scale, double-PWA (DPWA) and triple-PWA (TPWA) have demonstrated: larger resistive energy (>30 kJ/cm) and power (> 1TW/cm) gain [3], highest yield current scaling (I 1.8÷2 ) [3] among all loads tested at University-scale machines, anisotropy of power/yield dependent on wires' rows [5], and the possibility of radiation pulse shaping [6]. Planar foil liner (PFL) source (a promising alternative source to wire arrays [4]) has also shown yields which are close to the one of PWA, but with better axial Te and Ne gradients [4].…”

Section: Introductionmentioning

confidence: 99%

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New compact hohlraum configuration research at the 1.7 MA Z-pinch generator

Kantsyrev¹,

Chuvatin²,

Rudakov³

et al. 2014

AIP Conference Proceedings

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Abstract.A new compact Z-pinch x-ray hohlraum design with parallel-driven x-ray sources was experimentally demonstrated in a full configuration with a central target and tailored shine shields (to provide a symmetric temperature distribution on the target) at the 1.7 MA Zebra generator. This presentation reports on the joint success of two independent lines of research. One of these was the development of new sources --planar wire arrays (PWAs). PWAs turned out to be a prolific radiator. Another success was the drastic improvement in energy efficiency of pulsed-power systems, such as the Load Current Multiplier (LCM). The Zebra/LCM generator almost doubled the plasma load current to 1.7 MA. The two above-mentioned innovative approaches were used in combination to produce a new compact hohlraum design for ICF, as jointly proposed by SNL and UNR. Good agreement between simulated and measured radiation temperature of the central target is shown. Experimental comparison of PWAs with planar foil liners (PFL) -another viable alternative to wire array loads at multi-MA generators show promising data. Results of research at the University of Nevada Reno allowed for the study of hohlraum coupling physics at University-scale generators. The advantages of new hohlraum design applications for multi-MA facilities with W or Au double PWAs or PFL x-ray sources are discussed.

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Section: Demonstration Of Equally Redistributed Currents and The Syncmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New compact hohlraum configuration research at the 1.7 MA Z-pinch generator

Kantsyrev¹,

Chuvatin²,

Rudakov³

et al. 2014

AIP Conference Proceedings

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“…The latter feature is very useful for the design and optimization of wire array loads with the x-ray radiation pulse shaping capability [15]. Now we shall compare the wire ablation and implosion dynamics in different wire array configurations.…”

Section: B Double Planar Wire Arraymentioning

confidence: 99%

“…Two years later, the single planar array loads have been successfully tested at 3 − 5 MA currents on Saturn generator at SNL [5,13,14]. By now, several novel applications of planar wire arrays have been proposed and tested at UNR, such as the new hohlraum design for ICF-related experiments [5], the possibility of controlling the shape of the x-ray radiation pulse [15], the experiments with multi-planar arrays related to the laboratory astrophysics [16], and skewed wire double planar array configurations with induced axial magnetic field [17]. A continuous success in these research directions can be assured by the development and application of reliable modeling tools.…”

mentioning

confidence: 99%

Wire ablation dynamics model and its application to imploding wire arrays of different geometries

et al. 2012

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The paper presents an extended description of the amplified Wire Ablation Dynamics Model (WADM) that accounts in a single simulation for the processes of the wire ablation and implosion of a wire array load of arbitrary geometry and wire material composition. To investigate the role of the wire ablation effects, the implosions of cylindrical and planar wire array loads at the university based generators Cobra (Cornell University) and Zebra (University of Nevada, Reno) have been analyzed. The analysis of the experimental data shows that the wire mass ablation rate can be described as a function of the current through the wire and some coefficient defined by the wire material properties. The aluminum wires were found to ablate with the highest rate, while the copper ablation is the slowest one. The lower wire ablation rate results in higher inward velocity of the ablated plasma, higher rate of the energy coupling with the ablated plasma, and more significant delay of implosion for a heavy load due to the ablation effects, which manifest the most in a cylindrical array configuration and almost vanish in a single planar array configuration. The WADM is an efficient tool suited for wire array load design and optimization in wide parameter ranges, including the loads with specific properties needed for the Inertial Confinement Fusion research and laboratory astrophysics experiments. The data output from the WADM simulation can be used to simplify the radiation MHD modeling of the wire array plasma.

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“…This novel Z-pinch load is characterized by a combination of high total radiation yield (power >28-30 kJ/>1 TW) in nanosecond-scale rise time bursts, small size (array width D ∼ 3-6 mm and inter-row gap ∼ 1.5-6 mm), and by the possibility of its usefulness in radiation pulse shaping [3,4,6]. Another important feature of the DPWA configuration is its easy diagnostic access for observing plasma implosion and stagnation; diagnostic lines of sight can be directed parallel to the wire rows, which allows for easier study of the precursor formation with both optical laser diagnostics and time-gated x-ray pinhole imagers [3,4,7].…”

Section: Introductionmentioning

confidence: 99%

Influence of induced axial magnetic field on plasma dynamics and radiative characteristics ofZpinches

et al. 2011

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The influence of an induced axial magnetic field on plasma dynamics and radiative characteristics of Z pinches is investigated. An axial magnetic field was induced in a novel Z-pinch load: a double planar wire array with skewed wires (DPWAsk), which represents a planar wire array in an open magnetic configuration. The induced axial magnetic field suppressed magneto-Rayleigh-Taylor (MRT) instabilities (with m = 0 and m = 1 instability modes) in the Z-pinch plasma. The influence of the initial axial magnetic field on the structure of the plasma column at stagnation was manifested through the formation of a more uniform plasma column compared to a standard double planar wire array (DPWA) load [V. L. Kantsyrev et al., Phys. Plasmas 15, 030704 (2008)]. The DPWAsk load is characterized by suppression of MRT instabilities and by the formation of the sub-keV radiation pulse that occurs before the main x-ray peak. Gradients in plasma parameters along the cathode-anode gap were observed and analyzed for DPWAsk loads made from low atomic number Z (Al) and mid-Z (brass) wires.

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X-ray pulse shaping in experiments with planar wire arrays at the 1.6 MA Zebra generator

Cited by 7 publications

References 5 publications

New compact hohlraum configuration research at the 1.7 MA Z-pinch generator

New compact hohlraum configuration research at the 1.7 MA Z-pinch generator

Wire ablation dynamics model and its application to imploding wire arrays of different geometries

Influence of induced axial magnetic field on plasma dynamics and radiative characteristics ofZpinches

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