Visualization of the magnetic field and current path in Z-pinch and X-pinch plasmas

Anderson, A.; Иванов, В. В.; Papp, D.

doi:10.1016/j.hedp.2015.02.005

High Energy Density Physics

2015

DOI: 10.1016/j.hedp.2015.02.005

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Visualization of the magnetic field and current path in Z-pinch and X-pinch plasmas

A. Anderson

В. В. Иванов

D. Papp

Abstract: a b s t r a c tLaser diagnostics at the wavelength of 266 nm allow investigation of wire array Z-pinches and X-pinches at the 1 MA pulse power generator. Faraday rotation diagnostics at 266 nm is applied to study MG magnetic fields in Z-pinch plasma. Faraday diagnostics can qualitatively visualize magnetic fields in dense plasma and give additional information about the current flow even if the plasma density cannot be reconstructed with interferometry. A comparison of images from the three-channel polarimeter… Show more

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Cited by 4 publications

References 11 publications

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Investigation of asymmetry of wire-array Z pinches at stagnation using a 4-channel laser diagnostic

Иванов

Anderson

2016

High Energy Density Physics

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Asymmetry of wire-array Z-pinches at stagnation was investigated using four synchronized laser beams at the wavelength of 266 nm. These beams were spaced at 45° with respect to each other, allowing a full view of the pinch from four directions. The laser pulse duration was 0.2 ns, with a <0.1 ns temporal accuracy between the four channels. Strong asymmetry was found in Z pinches produced by implosion of asymmetrical wire array loads. Anisotropy of the wire-array Z pinch arises due to the asymmetric implosion and development of plasma instabilities. Understanding the three-dimension structure of Z-pinches is important for interpretation of data from x-ray and laser diagnostics.

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Investigation of asymmetry of wire-array Z pinches at stagnation using a 4-channel laser diagnostic

Иванов

Anderson

2016

High Energy Density Physics

Self Cite

View full text Add to dashboard Cite

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Investigation of wire-array Z-pinches by laser probing diagnostics

Иванов

Anderson

Papp

2019

Matter and Radiation at Extremes

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Laser diagnostics provides powerful tools for the investigation of dense Z-pinches. In this paper, wire-array Z-pinches are investigated at the 1 MA Zebra generator using laser diagnostics at different wavelengths coupled with x-ray diagnostics. Plasma dynamics during the ablation, implosion, and stagnation stages are observed by multiframe diagnostics. Cascading and nonprecursor implosions are studied in wire arrays. Ultraviolet diagnostics allows deep penetration into the Z-pinch plasma at stagnation. End-on probing reveals the complicated structure of the precursor. Strong magnetohydrodynamic instabilities are found in a dense pinch hidden in the trailing plasma. Small-scale instabilities are seen in the Z-pinch plasma with micrometer resolution. Probing of the pinch from four directions shows asymmetrical trailing plasma in some configurations of wire arrays. Faraday rotation diagnostics reveals the magnetic fields and the current distribution in the plasma of the precursor and Z-pinch. Redistribution of current in the trailing plasma is seen during kink and sausage instabilities in the stagnation stage. The formation of micropinches and hot spots in the Z-pinch is analyzed with coupled laser and x-ray diagnostics. Different laser diagnostics allow the study of Z-pinch plasmas in all stages, including fast dynamics and instabilities.

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Mapping of azimuthal B-fields in Z-pinch plasmas using Z-pinch-driven ion deflectometry

et al. 2021

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B-field measurements are crucial for the study of high-temperature and high-energy-density plasmas. A successful diagnostic method, ion deflectometry (radiography), is commonly employed to measure MGauss magnetic fields in laser-produced plasmas. It is based on the detection of multi-MeV ions, which are deflected in B-fields and measure their path integral. Until now, protons accelerated via laser–target interactions from a point-like source have been utilized for the study of Z-pinch plasmas. In this paper, we present the results of the first Z-pinch-driven ion deflectometry experiments using MeV deuterium beams accelerated within a hybrid gas-puff Z-pinch plasma on the GIT-12 pulse power generator. In our experimental setup, an inserted fiducial deflectometry grid (D-grid) separates the imploding plasma into two regions of the deuteron source and the studied azimuthal B-fields. The D-grid is backlighted by accelerated ions, and its shadow imprinted into the deuteron beams demonstrates ion deflections. In contrast to the employment of the conventional point-like ion source, in our configuration, the ions are emitted from the extensive and divergent source inside the Z-pinch. Instead of having the point ion source, deflected ions are selected via a point projection by a pinhole camera before their detection. Radial distribution of path-integrated B-fields near the axis (within a 15 mm radius) is obtained by analysis of experimental images (deflectograms). Moreover, we present a 2D topological map of local azimuthal B-fields B(r,z) via numerical retrieval of the experimental deflectogram.

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Visualization of the magnetic field and current path in Z-pinch and X-pinch plasmas

Cited by 4 publications

References 11 publications

Investigation of asymmetry of wire-array Z pinches at stagnation using a 4-channel laser diagnostic

Investigation of asymmetry of wire-array Z pinches at stagnation using a 4-channel laser diagnostic

Investigation of wire-array Z-pinches by laser probing diagnostics

Mapping of azimuthal B-fields in Z-pinch plasmas using Z-pinch-driven ion deflectometry

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