Compression of a laser initiated hollow gas embedded z-pinch

Veloso, Felipe; Chuaqui, H.; Correa, N; Favre, M.; Wyndham, E.

doi:10.1088/0963-0252/18/4/045012

Cited by 5 publications

(1 citation statement)

References 20 publications

(32 reference statements)

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“…So far with no observations of neutrons or x-rays, there are no disruptions, the achievable temperatures by Joule heating alone are rather modest. This idea of employing compression both to insulate the plasma from accretion from the neutrals outside, and to have more heating has been followed up by Veloso et al [558] using a laser-initiated hollow gas-embedded Z-pinch. The peak current of 150 kA led to an implosion velocity of 5 km s −1 , and the plasma column remained hollow and stable for 10 Alfvén transit times at a Bennett temperature of 150 eV.…”

Section: Gas-embedded Pinchmentioning

confidence: 99%

A review of the denseZ-pinch

Haines

2011

Plasma Phys. Control. Fusion

391

184

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The Z-pinch, perhaps the oldest subject in plasma physics, has achieved a remarkable renaissance in recent years, following a few decades of neglect due to its basically unstable MHD character. Using wire arrays, a significant transition at high wire number led to a great improvement in both compression and uniformity of the Z-pinch. Resulting from this the Z-accelerator at Sandia at 20 MA in 100 ns has produced a powerful, short pulse, soft x-ray source >230 TW for 4.5 ns) at a high efficiency of ∼15%. This has applications to inertial confinement fusion. Several hohlraum designs have been tested. The vacuum hohlraum has demonstrated the control of symmetry of irradiation on a capsule, while the dynamic hohlraum at a higher radiation temperature of 230 eV has compressed a capsule from 2 mm to 0.8 mm diameter with a neutron yield >3 × 10 11 thermal DD neutrons, a record for any capsule implosion. World record ion temperatures of >200 keV have recently been measured in a stainless-steel plasma designed for Kα emission at stagnation, due, it was predicted, to ion-viscous heating associated with the dissipation of fast-growing short wavelength nonlinear MHD instabilities. Direct fusion experiments using deuterium gas-puffs have yielded 3.9×10 13 neutrons with only 5% asymmetry, suggesting for the first time a mainly thermal source. The physics of wire-array implosions is a dominant theme. It is concerned with the transformation of wires to liquid-vapour expanding cores; then the generation of a surrounding plasma corona which carries most of the current, with inward flowing low magnetic Reynolds number jets correlated with axial instabilities on each wire; later an almost constant velocity, snowplough-like implosion occurs during which gaps appear in the cores, leading to stagnation on the axis, and the production of the main soft-x-ray pulse. These studies have been pursued also with smaller facilities in other laboratories around the world. At Imperial College, conical and radial wire arrays have led to highly collimated tungsten plasma jets with a Mach number of >20, allowing laboratory astrophysics experiments to be undertaken. These highlights will be underpinned in this review with the basic physics of Z-pinches including stability, kinetic effects, and finally its applications.

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Section: Gas-embedded Pinchmentioning

confidence: 99%

A review of the denseZ-pinch

Haines

2011

Plasma Phys. Control. Fusion

391

184

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A novel dielectric barrier discharge ozone generator with excellent microdischarge temperature behavior

Xie,

Yuan,

Wang

et al. 2024

Applied Thermal Engineering

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Note: Infrared laser diagnostics for deuterium gas puff Z pinches

Иванов

McKee

Hammel

et al. 2017

Review of Scientific Instruments

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Deuterium gas puff Z pinches have been used for generation of strong neutron fluxes on the MA class pulse power machines. Due to the low electron density of deuterium Z-pinch plasma, regular laser diagnostics in the visible range cannot be used for observation and study of the pinch. Laser probing at the wavelength of 1064 nm was used for visualization of deuterium plasma. Infrared schlieren and interferometry diagnostics showed the deuterium gas puff plasma dynamics, instabilities, and allowed for the reconstruction of the profile of the plasma density.

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Compression of a laser initiated hollow gas embedded z-pinch

Cited by 5 publications

References 20 publications

A review of the denseZ-pinch

A review of the denseZ-pinch

A novel dielectric barrier discharge ozone generator with excellent microdischarge temperature behavior

Note: Infrared laser diagnostics for deuterium gas puff Z pinches

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