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

Esaulov, A. A.; Kantsyrev, V.L.; Safronova, A.S.; Velikovich, A. L.; Shrestha, I.; Williamson, K.; Osborne, G. C.

doi:10.1103/physreve.86.046404

Cited by 14 publications

(4 citation statements)

References 33 publications

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“…For example, Fig. 2 displays shadowgraphy images recorded at 54 and 61 ns after the current start in shot 2790 on Zebra together with Wire Ablation Dynamics Model [7] simulations of the global magnetic field configurations and plasma mass density with probable location of standing shocks shown with crosses. Figure 2 illustrates that using PWAs and having them of larger size, provides better diagnostic access: for example, it allows for registration of the dynamic features such as standing shocks.…”

Section: Motivation Experimental Details and Resultsmentioning

confidence: 99%

Larger sized wire arrays on 1.5 MA Z-pinch generator

Safronova¹,

Kantsyrev²,

Weller³

et al. 2014

AIP Conference Proceedings

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Abstract. Experiments on the UNR Zebra generator with Load Current Multiplier (LCM) allow for implosions of larger sized wire array loads than at standard current of 1 MA. Advantages of larger sized planar wire array implosions include enhanced energy coupling to plasmas, better diagnostic access to observable plasma regions, and more complex geometries of the wire loads. The experiments with larger sized wire arrays were performed on 1.5 MA Zebra with LCM (the anode-cathode gap was 1 cm, which is half the gap used in the standard mode). In particular, larger sized multiplanar wire arrays had two outer wire planes from mid-atomic-number wires to create a global magnetic field (gmf) and plasma flow between them. A modified central plane with a few Al wires at the edges was put in the middle between outer planes to influence gmf and to create Al plasma flow in the perpendicular direction (to the outer arrays plasma flow). Such modified plane has different number of empty slots: it was increased from 6 up to 10, hence increasing the gap inside the middle plane from 4.9 to 7.7 mm, respectively. Such load configuration allows for more independent study of the flows of L-shell mid-atomic-number plasma (between the outer planes) and K-shell Al plasma (which first fills the gap between the edge wires along the middle plane) and their radiation in space and time. We demonstrate that such configuration produces higher linear radiation yield and electron temperatures as well as advantages of better diagnostics access to observable plasma regions and how the load geometry (size of the gap in the middle plane) influences K-shell Al radiation. In particular, K-shell Al radiation was delayed compared to L-shell mid-atomic-number radiation when the gap in the middle plane was large enough (when the number of empty slots was increased up to ten). MOTIVATION, EXPERIMENTAL DETAILS, AND RESULTS

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Section: Motivation Experimental Details and Resultsmentioning

confidence: 99%

Larger sized wire arrays on 1.5 MA Z-pinch generator

Safronova¹,

Kantsyrev²,

Weller³

et al. 2014

AIP Conference Proceedings

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“…13. Esaulov et al analyzed the hydrodynamic collision mode and the transparent inner mode with a wire dynamics model (WDM) [79], which was then updated into the WADM model [81] with effects due to the ablated plasma. However, these methods are all based on the thin shell assumption, and the effects from wire number and interwire gaps are neglected.…”

Section: Nested Wire Arraysmentioning

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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“…For SPWA loads, the wires are involved in a cascade-type implosion starting with the outermost wires and ending with the innermost wires. 20 SPWA implosions result in the formation of a Z-pinch at the geometrical center of the load that is manifested by the appearance of soft and hard X-ray radiation. Then, formation of a hot, dense and highly radiating Z-pinch is followed by stagnation, which is characterized by multiple X-ray bursts and after few tens of ns the pinch is destroyed by MHD instabilities.…”

Section: Single Planar Wire Arraysmentioning

confidence: 99%

Radiative signatures of Z-pinch plasmas at UNR: from X-pinches to wire arrays

Safronova

Kantsyrev

Esaulov

et al. 2014

Int. J. Mod. Phys. Conf. Ser.

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University-scale Z-pinch generators are able to produce High Energy Density (HED) plasmas in a broad range of plasma parameters under well-controlled and monitored experimental conditions suitable for radiation studies. The implosion of X-pinch and wire array loads at a 1 MA generator yields short (1-20 nsec) x-ray bursts from one or several bright plasma spots near the wire cross point (for X-pinches) or along and near Z-pinch axis (for wire arrays). Such X- and Z-pinch HED plasma with scales from a few µm to several mm in size emits radiation in a broad range of energies from 10 eV to 0.5 MeV and is subject of our studies during the last ten years. In particular, the substantial number of experiments with very different wire loads was performed on the 1 MA Zebra generator and analyzed: X-pinch, cylindrical, nested, and various types of the novel load, Planar Wire Arrays (PWA). Also, the experiments at an enhanced current of 1.5-1.7 MA on Zebra using Load Current Multiplier (LCM) were performed. This paper highlights radiative signatures of X-pinches and Single and Double PWAs which are illustrated using the new results with combined wire loads from two different materials.

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

Cited by 14 publications

References 33 publications

Larger sized wire arrays on 1.5 MA Z-pinch generator

Larger sized wire arrays on 1.5 MA Z-pinch generator

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

Radiative signatures of Z-pinch plasmas at UNR: from X-pinches to wire arrays

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