A 1MA, variable risetime pulse generator for high energy density plasma research

Greenly, J. B.; Douglas, Jennifer; Hammer, D. A.; Kusse, B. R.; Glidden, S.C.; Sanders, Howard D.

doi:10.1063/1.2949819

Cited by 86 publications

(26 citation statements)

References 5 publications

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“…These plasmas are accelerated toward the array axis by magnetic pressure and accumulate there to form M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT a precursor column, while the cold-dense wire cores are stable in their original positions and keep ablating. Experimental results show that the basic processes of wire-array ablation on the 20-MA Z machine [32] are similar to that on the smaller current facilities such as ANGARA [33], MAGPIE [34] and COBRA [35]. The ablation rate of wire core is axially nonuniform, and the ablated plasmas will carry a significant fraction of current.…”

Section: Ablation and Initializationmentioning

confidence: 80%

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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Section: Ablation and Initializationmentioning

confidence: 80%

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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“…The experimental setup used to obtain the absorption spectra on the COBRA pulsed power generator at Cornell University 9 is shown in Fig. 1(a).…”

Section: Methodsmentioning

confidence: 99%

Calibration and analysis of spatially resolved x-ray absorption spectra from a nonuniform plasma

Knapp

Hansen

Pikuz

et al. 2012

Review of Scientific Instruments

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We report here the calibration and analysis techniques used to obtain spatially resolved density and temperature measurements of a pair of imploding aluminum wires from x-ray absorption spectra. A step wedge is used to measure backlighter fluence at the film, allowing transmission through the sample to be measured with an accuracy of ±14% or better. A genetic algorithm is used to search the allowed plasma parameter space and fit synthetic spectra with 20 μm spatial resolution to the measured spectra, taking into account that the object plasma nonuniformity must be physically reasonable. The inferred plasma conditions must be allowed to vary along the absorption path in order to obtain a fit to the spectral data. The temperature is estimated to be accurate to within ±25% and the density to within a factor of two. This information is used to construct two-dimensional maps of the density and temperature of the object plasma.

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“…In our experimental setup, a thin metallic foil on the order of 10 lm thick is stretched onto the anode of a pulsed power generator such as COBRA (Ref. 5) or MAGPIE. 6 The current flows radially through the foil and converges to a stainless steel pin connected to the generator cathode by a brass electrode.…”

Section: Introductionmentioning

confidence: 99%

Magnetohydrodynamic instabilities in radial foil configurations

et al. 2012

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While detrimental to plasma performance, magnetohydrodynamic plasma instabilities in radial foil configurations do not preclude intense x-ray radiations from the central plasma column. As most of the plasma current flows there, the column pinches generating x-rays. However, pinch comes with a kink instability which twists the column and prevents homogeneous compression. This instability leads to the disruption of the plasma bubble surrounding the central plasma column. Loss of symmetry in the resulting plasma expansion has been recorded. It is possible to reduce the impact of instabilities by increasing the initial plasma mass. The central column can also be stabilized by using a central rod, delaying the formation of the kink. V C 2012 American Institute of Physics.

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A 1MA, variable risetime pulse generator for high energy density plasma research

Cited by 86 publications

References 5 publications

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

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

Calibration and analysis of spatially resolved x-ray absorption spectra from a nonuniform plasma

Magnetohydrodynamic instabilities in radial foil configurations

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