Applied spectroscopy in pulsed power plasmas

Rochau, Gregory A.; Bailey, James E.; Maron, Y.

doi:10.1063/1.3309722

Cited by 9 publications

(2 citation statements)

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“…We also note that since the probes were calibrated using a slower current pulse compared with MAGPIE's 250 ns rise time current response, there may be additional unaccounted systematic error in the probe calibration. To ascertain the systematic error in the b-dot probe measurement, simultaneous magnetic field measurements alongside other magnetic diagnostics, such as Zeeman splitting of spectral lines (Rochau, Bailey & Maron 2010), or Faraday rotation polarimetry (Swadling et al. 2014), can be performed in future work.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

The structure of 3-D collisional magnetized bow shocks in pulsed-power-driven plasma flows

et al. 2022

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We investigate three-dimensional (3-D) bow shocks in a highly collisional magnetized aluminium plasma, generated during the ablation phase of an exploding wire array on the MAGPIE facility (1.4 MA, 240 ns). Ablation of plasma from the wire array generates radially diverging, supersonic ( $M_S \sim 7$ ), super-Alfvénic ( $M_A > 1$ ) magnetized flows with frozen-in magnetic flux ( $R_M \gg 1$ ). These flows collide with an inductive probe placed in the flow, which serves both as the obstacle that generates the magnetized bow shock, and as a diagnostic of the advected magnetic field. Laser interferometry along two orthogonal lines of sight is used to measure the line-integrated electron density. A detached bow shock forms ahead of the probe, with a larger opening angle in the plane parallel to the magnetic field than in the plane normal to it. Since the resistive diffusion length of the plasma is comparable to the probe size, the magnetic field decouples from the ion fluid at the shock front and generates a hydrodynamic shock, whose structure is determined by the sonic Mach number, rather than the magnetosonic Mach number of the flow. The 3-D simulations performed using the resistive magnetohydrodynamic (MHD) code Gorgon confirm this picture, but under-predict the anisotropy observed in the shape of the experimental bow shock, suggesting that non-MHD mechanisms may be important for modifying the shock structure.

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Section: Discussion Of Resultsmentioning

confidence: 99%

The structure of 3-D collisional magnetized bow shocks in pulsed-power-driven plasma flows

et al. 2022

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“…In general, spectroscopic methods based on the Zeeman effect for the determination of magnetic fields in plasmas, are limited due to their sensitivity to density-or temperature-induced broadenings [4,5]. Alternative approaches to Zeeman spectroscopy are based on Farady rotation [6][7][8][9], B probes [10][11][12][13] or proton beam deflectometry [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Measurements of the spatial magnetic field distribution in a z-pinch plasma throughout the stagnation process

et al. 2017

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We report on measurements, made for the first time for an imploding plasma at its stagnation, of the magnetic field spatial distribution. Utilized for the measurements is a spectroscopic technique based on simultaneous recording of each of the left-and right-handed circularly polarized Zeeman emissions. While this method allows for overcoming the Stark-and Doppler-broadenings that obscure the Zeeman splitting, it requires a line of sight that is parallel to the magnetic field lines. To this end, the radial charge-state distribution in the stagnating z-pinch plasma was measured, and the method was employed for emission lines of several selected charge states located in various radial locations. This also allowed for measuring the time-resolved magnetic field radial distribution in a single discharge, which is advantageous for high-energy-density plasma experiments. These distributions were measured at various locations along the pinch axis. K : Plasma diagnostics-charged-particle spectroscopy; Plasma diagnostics-high speed photography; Plasma diagnostics-interferometry, spectroscopy and imaging 1Corresponding author.

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High Energy Densities in Laboratories

Фортов

2016

Extreme States of Matter

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Applied spectroscopy in pulsed power plasmas

Cited by 9 publications

References 61 publications

The structure of 3-D collisional magnetized bow shocks in pulsed-power-driven plasma flows

The structure of 3-D collisional magnetized bow shocks in pulsed-power-driven plasma flows

Measurements of the spatial magnetic field distribution in a z-pinch plasma throughout the stagnation process

High Energy Densities in Laboratories

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