&lt;title&gt;The X pinch as an x-ray source for point-projection radiography&lt;/title&gt;

Pikuz, S. A.; Shelkovenko, T. A.; Mingaleev, A. R.; Romanova, V. M.; Song, B. M.; Chandler, K. M.; Mitchell, M. D.; Hammer, D. A.

doi:10.1117/12.639993

Cited by 10 publications

(2 citation statements)

References 3 publications

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“…[3][4][5][6][7] The side-on backlighting system has been achieved in many universities and national laboratories for the r-z profile measurements of Z-pinch plasmas. [4,5,[8][9][10][11][12][13] Images taken from the r-θ plane are quite necessary for quantitative measurements of the axial distribution of the Z-pinch plasma density. Thus, it is useful to design an axial (end-on) backlighting system.…”

Section: Introductionmentioning

confidence: 99%

End-on x-ray backlighting experiments for axial diagnostics of wire-array Z-pinch plasma on PPG-1

Zhao¹,

Zhu²,

Shi³

et al. 2017

Chinese Phys. B

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An X-pinch axial backlighting system has been designed to quantitatively measure the density distribution of wirearray Z-pinch plasmas. End-on backlighting experiments were carried out on a 200 kA, 100 ns pulsed-power generator (PPG-1) at the Tsinghua University. Compared with side-on backlighting, end-on measurements provide an axial view of the evolution of Z-pinch plasmas. Early stages of 2-, 4-, and 8-wire Z-pinch plasmas were observed via point-projection backlighting radiography with a relatively high success rate. The density distribution of Z-pinch plasma on the r-θ plane was obtained directly from the images with the help of step wedges, and the inward radial velocity was calculated. The ablation rates obtained by X-pinch backlighting experiments are compared in detail with those calculated by the rocket model and the results show consistency.

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Section: Introductionmentioning

confidence: 99%

End-on x-ray backlighting experiments for axial diagnostics of wire-array Z-pinch plasma on PPG-1

Zhao¹,

Zhu²,

Shi³

et al. 2017

Chinese Phys. B

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“…[1][2][3] This puts the expensive crystal at high risk for destruction when the plasma under study produces significant debris. However, in cases where the plasma of interest radiates intensely, as with wire array z-pinches, x-pinches, or hohlraum studies, traditional point-projection radiography may not work.…”

Section: Introductionmentioning

confidence: 99%

Quasimonochromatic x-ray backlighting on the COrnell Beam Research Accelerator (COBRA) pulsed power generator

Knapp

Greenly

Gourdain

et al. 2010

Review of Scientific Instruments

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Monochromatic x-ray backlighting has been employed with great success for imaging of plasmas with strong self-emission such as x-pinches and wire array z-pinches. However, implementation of a monochromatic backlighting system typically requires extremely high quality spherically bent crystals which are difficult to manufacture and can be prohibitively expensive. Furthermore, the crystal must have a direct line of sight to the object, which typically emits copious amounts of radiation and debris. We present a quasimonochromatic x-ray backlighting system which employs an elliptically bent mica crystal as the dispersive element. In this scheme a narrow band of continuum radiation is selected for imaging, instead of line radiation in the case of monochromatic imaging. The flat piece of mica is bent using a simple four-point bending apparatus that allows the curvature of the crystal to be adjusted in situ for imaging in the desired wavelength band. This system has the advantage that it is very cost effective, has a large aperture, and is extremely flexible. The principles of operation of the system are discussed and its performance is analyzed.

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Study of X-pinch dynamics using a low current (25 kA) and slower current (400 ns) pulse

et al. 2013

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We report on experiments examining the dynamics of low current (25 kA), long rise-time (400 ns) X-pinches. The experiments used two- and four-wire 5 μm tungsten X-pinches. We discuss coronal plasma dynamics, X-ray emission, cross-point evolution, and axial column dynamics. We show that the pinch dynamics are akin to those in X-pinches driven by 0.1–1 MA and at rise-rates from 0.25 to 10 kA/ns. We observe soft X-rays (∼1–2 keV range) emitted from the cross point in both two-wire and four-wire X-pinches at about peak current. These results show that compact current generators consisting of 2–4 small capacitors in a simple capacitive discharge circuit can produce good quality pinches for applications in Thomson X-ray scattering and backlighting among others.

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<title>The X pinch as an x-ray source for point-projection radiography</title>

Cited by 10 publications

References 3 publications

End-on x-ray backlighting experiments for axial diagnostics of wire-array Z-pinch plasma on PPG-1

End-on x-ray backlighting experiments for axial diagnostics of wire-array Z-pinch plasma on PPG-1

Quasimonochromatic x-ray backlighting on the COrnell Beam Research Accelerator (COBRA) pulsed power generator

Study of X-pinch dynamics using a low current (25 kA) and slower current (400 ns) pulse

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