Radiative properties of implosions of combined X-pinches and planar wire arrays composed from different wire materials on the UNR 1 MA Z-pinch generator

Safronova, A.S.; Kantsyrev, V.L.; Yilmaz, M.F.; Osborne, G. C.; Ouart, N.; Williamson, K.; Shrestha, I.; Shlyaptseva, V. V.; Batie, S.; LeGalloudec, B.; Astanovitsky, A.; Nalajala, V.; McDaniel, W.C.

doi:10.1016/j.hedp.2007.02.025

Cited by 22 publications

(5 citation statements)

References 15 publications

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] In this introduction, we will use words bright spots, micro-pinches, hot spots, and plasma points, as they are mentioned in the original cited articles. Apparently, plasma instabilities generate areas in the pinch with a high plasma density and temperature.…”

Section: Introductionmentioning

confidence: 99%

“…[7][8][9][10][11][12] The electron temperature in bright spots (micro-pinches, hot spots, plasma points) varies from 0.3 to 3 keV in different experiments and pinch configurations. 3,4,13,14,[18][19][20][21] Micro-pinches in Z-pinch plasmas are the source of enhanced x-ray radiation. They contribute to the energy balance, x-ray production, and neutron yield in Z pinches.…”

Section: Introductionmentioning

confidence: 99%

“…Electron temperatures of micropinches of 0.3-3 keV were measured in different wire-array Z pinches. 4,[18][19][20] Continuum spectra of hot spots in the keV range may be a signature of a high plasma density. 16,17 Recently, axially resolved spectroscopy and K-shell power measurements were applied to stagnated Al, Cu, and Ti Z pinches on the Z machine.…”

Section: Introductionmentioning

confidence: 99%

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Study of micro-pinches in wire-array Z pinches

et al. 2013

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Bright and hot areas with a high plasma density and temperature are observed in all kinds of Z pinches. We studied bright radiating spots produced by micro-pinches in cylindrical and planar wire-arrays at the 1 MA Zebra pulsed power generator using an x-ray streak camera synchronized with laser diagnostics, x-ray time-gated pinhole camera, and spectroscopy. Hot spots with extremely dense and relatively hot plasma arise during the collapse of the micro-pinches. These hot spots radiate a continuum spectrum with energy >2.5 keV. Typical micro-pinches in Al wire arrays generate x-ray bursts with durations of 0.4-1 ns in the soft x-ray range and 0.1-0.4 ns in the keV range. UV two-frame shadowgraphy shows spatial correlation of hot spots with the collapse and explosion of micro-pinches. Micro-pinches typically occur at the necks of the Z pinch, but can demonstrate a variety of parameters and different dynamics. An analysis of x-ray streak images shows that micro-pinches can generate >20% of the x-ray energy in some types of wire-array Z pinches. V C 2013 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of micro-pinches in wire-array Z pinches

et al. 2013

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“…Figure 2 shows the experimental spectra for three different laser conditions collected by the KAP spectrometer compared to modelling from a nonlocal thermodynamic equilibrium (non-LTE) kinetics model [30]. The Mg model includes all ionization stages with detailed structure.…”

Section: Comparison To Experimentsmentioning

confidence: 99%

Analysis of Mg spectral features produced by irradiations of laser pulses with different contrast and pulse durations

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et al. 2014

J. Phys. B: At. Mol. Opt. Phys.

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Experiments performed at the Leopard Laser Facility at the Nevada Terawatt Facility of the University of Nevada, Reno have produced K-shell Mg spectra with complex satellite features. K-shell Mg spectra were collected from experiments comprised of three different conditions related to laser pulse and contrast. Two spectrometers were fielded: a survey convex spectrometer with a potassium hydrogen phthalate (KAP) crystal (R ∼ 300) and a high resolution focusing spectrometer with spatial resolution using a spherically bent mica crystal (R ∼ 3000). These spectra included dielectronic satellite (DS) lines that were investigated using the quasi-relativistic many-body perturbation theory (MZ) code for previously identified transitions from autoionizing 2lnl states in He-like Mg and new transitions involving autoionizing 1s3lnl states in Li-like Mg and 1s3l3l 3l in Be-like Mg calculated using the Hartree-Fock-relativistic method (COWAN code). Radiative and non-radiative data are combined to obtain branching ratios, intensities and effective emission rate coefficients of DS lines. Synthetic spectra were matched to experimental data to identify strong satellite structures to the Heβ (7.8507 Å) and Lyα (8.4192 Å) resonance transitions.

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“…The T e and N e spatial distribution for Al and brass DPWAsks were found to be drastically different. The difference in x-ray radiation and spectroscopy measurements are due to the fact that the modeled spectral region represents two different types of radiation: K-shell radiation of Al and L-shell radiation of Cu and Zn radiation, which have, in general, different radiative properties that were studied and described elsewhere (see, for example, [18,19]). …”

Section: B Experiments With Al and Brass Dpwasksmentioning

confidence: 99%

Influence of induced axial magnetic field on plasma dynamics and radiative characteristics ofZpinches

et al. 2011

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The influence of an induced axial magnetic field on plasma dynamics and radiative characteristics of Z pinches is investigated. An axial magnetic field was induced in a novel Z-pinch load: a double planar wire array with skewed wires (DPWAsk), which represents a planar wire array in an open magnetic configuration. The induced axial magnetic field suppressed magneto-Rayleigh-Taylor (MRT) instabilities (with m = 0 and m = 1 instability modes) in the Z-pinch plasma. The influence of the initial axial magnetic field on the structure of the plasma column at stagnation was manifested through the formation of a more uniform plasma column compared to a standard double planar wire array (DPWA) load [V. L. Kantsyrev et al., Phys. Plasmas 15, 030704 (2008)]. The DPWAsk load is characterized by suppression of MRT instabilities and by the formation of the sub-keV radiation pulse that occurs before the main x-ray peak. Gradients in plasma parameters along the cathode-anode gap were observed and analyzed for DPWAsk loads made from low atomic number Z (Al) and mid-Z (brass) wires.

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Radiative properties of implosions of combined X-pinches and planar wire arrays composed from different wire materials on the UNR 1 MA Z-pinch generator

Cited by 22 publications

References 15 publications

Study of micro-pinches in wire-array Z pinches

Study of micro-pinches in wire-array Z pinches

Analysis of Mg spectral features produced by irradiations of laser pulses with different contrast and pulse durations

Influence of induced axial magnetic field on plasma dynamics and radiative characteristics ofZpinches

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