Investigation into the dynamics of laser-cut foil X-pinches and their potential use for high repetition rate operation

Collins, Gilbert; Valdivia, M. P.; Zick, T.; Kim, J.; Haas, David M.; Forsman, A.; Stephens, R. B.; Beg, F. N.

doi:10.1063/1.4889748

Cited by 10 publications

(2 citation statements)

References 19 publications

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“…X-ray emission from three types of X-pinch configurationswire [39,75] (WXP), hybrid [76,77] (HXP), and laser-cut [78,79] (LCXP)-was systematically studied to determine the optimal x-ray backlighting source for TXD. WXPs are composed by a set of crossed thin wires (few to hundreds of microns) in the shape on an 'X' (figure 3(a)), as described above in section 1.…”

Section: X-pinch X-ray Backlightersmentioning

confidence: 99%

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Wire, hybrid, and laser-cut X-pinches as Talbot–Lau backlighters for electron density diagnostics

Valdivia¹,

Collins²,

Conti³

et al. 2022

Plasma Phys. Control. Fusion

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Talbot-Lau X-ray Deflectometry (TXD) enables refraction-based imaging for high-energy-density physics (HEDP) experiments, and thus, it has been studied and developed with the goal of diagnosing plasmas relevant to Inertial Confinement and Magnetic Liner Inertial Fusion. X-pinches, known for reliably generating fast (~1 ns), small (~1 µm) x-ray sources, were driven on the compact current driver GenASIS (~200 kA, 150 ns) as a potential backlighter source for TXD. Considering that different X-pinch configurations have characteristic advantages and drawbacks as x-ray generating loads, three distinct copper X-pinch configurations were studied: the wire X-pinch, the hybrid X-pinch, and the laser-cut X-pinch. The Cu K-shell emission from each configuration was characterized and analyzed regarding the specific backlighter requirements for an 8 keV TXD system: spatial and temporal resolution, number of sources, time of emission, spectrum, and reproducibility. Recommendations for future experimental improvements and applications are presented. The electron density of static objects was retrieved from Moiré images obtained through TXD. This allowed to calculate the mass density of static samples within 4% of the expected value for laser-cut X-pinches, which were found to be the optimal X-pinch configuration for TXD due to their high reproducibility, small source size (≤5 µm), short duration (~1 ns FWHM), and up to 10^6 W peak power near 8 keV photon energy. Plasma loads were imaged through TXD for the first-time using laser-cut X-pinch backlighting. Experimental images were compared with simulations from the X-ray Wave-Front Propagation code, demonstrating that TXD can be a powerful x-ray refraction-based diagnostic for dense Z-pinch loads. Future plans for Talbot-Lau Interferometry diagnostics in the pulsed-power environment are described.

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Section: X-pinch X-ray Backlightersmentioning

confidence: 99%

“…• LCXPs machined from 25 and 30 µm thick annealed or hardened temper copper foil with an average cross-point width of ∼25 µm (see figure 3(c)). The foils were cut using a TRUMPF Trumark 5000 laser workstation with a target design similar to that found in [31,78,79].…”

Section: • Hxps Of 25 µM Diameter Cu or Constantan (45% Ni-55%mentioning

confidence: 99%

Wire, hybrid, and laser-cut X-pinches as Talbot–Lau backlighters for electron density diagnostics

Valdivia¹,

Collins²,

Conti³

et al. 2022

Plasma Phys. Control. Fusion

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Evolution of X-pinch loads for pulsed power generators with current from 50 to 5000 kA

Shelkovenko¹,

Pikuz²,

Tilikin³

et al. 2018

Matter and Radiation at Extremes

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Modeling of the L-shell copper X-pinch plasma produced by the compact generator of Ecole polytechnique using pattern recognition

et al. 2016

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International audiencePrincipal component analysis is applied and compared with the line ratios of special Ne-like transitions for investigating the electron beam effects on the L-shell Cu synthetic spectra. The database for the principal component extraction is created over a non Local Thermodynamic Equilibrium (non-LTE) collisional radiative L-shell Copper model. The extracted principal components are used as a database for Artificial Neural Network in order to estimate the plasma electron temperature density and beam fractions from a representative time-integrated spatially resolved L-shell Cu X-pinch plasma spectrum. The spectrum is produced by the explosion of 25-μm Cu wires on a compact LC (40 kV 200 kA and 200 ns) generator. The modeled plasma electron temperatures are about Te ∼ 150 eV and Ne = 5 × 1019 cm−3 in the presence of the fraction of the beams with f ∼ 0.05 and a centered energy of ∼10 keV

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Investigation into the dynamics of laser-cut foil X-pinches and their potential use for high repetition rate operation

Cited by 10 publications

References 19 publications

Wire, hybrid, and laser-cut X-pinches as Talbot–Lau backlighters for electron density diagnostics

Wire, hybrid, and laser-cut X-pinches as Talbot–Lau backlighters for electron density diagnostics

Evolution of X-pinch loads for pulsed power generators with current from 50 to 5000 kA

Modeling of the L-shell copper X-pinch plasma produced by the compact generator of Ecole polytechnique using pattern recognition

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