The importance of EBIT data for Z-pinch plasma diagnostics

Safronova, A.S.; Kantsyrev, V.L.; Neill, P.; Safronova, U. I.; Fedin, D. A.; Ouart, N. D.; Yilmaz, M.F.; Osborne, G. C.; Shrestha, I.; Williamson, K.; Hoppe, Travis; Harris, C. L.; Beiersdörfer, P.; Hansen, Stephanie B.

doi:10.1139/p07-170

Cited by 31 publications

(8 citation statements)

References 38 publications

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“…The spectroscopic study of tungsten has become of great interest because of tungsten's renewed role in magnetic fusion and radiation source development [14][15][16]. Recent measurements have included those of near-lithiumlike tungsten (W 71+ ) [17], near-sodiumlike tungsten (W 61+ ) [18,19], near-nickellike tungsten (W 46+ ) [20][21][22][23][24], near-palladiumlike tungsten (W 28+ ) [25], promethiumlike tungsten (W 15+ ) [26], and near-ytterbiumlike tungsten (W 4+ ) [27].…”

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confidence: 99%

L-shell x-ray emission from neonlike W64+

et al. 2012

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We present high-resolution crystal spectroscopy measurements of the n = 3 → n = 2 L-shell x-ray transitions of neonlike W 64+ , which include seven electric dipole allowed transitions, two electric quadrupole transitions, and one magnetic quadrupole transition. The resulting wavelength data are compared to recent calculational results, allowing us to clearly distinguish between different theoretical approaches, which need to take into account not only substantial electron correlations effects but also radiative contributions, which in case of the transition from upper level (1s 2 2s 1/2 2p 6 3p 3/2) J=1 to the closed-shell neonlike ground state exceeds 20 eV. Best agreement is found with calculations utilizing the relativistic multi-reference Møller-Plesset approach. In addition to the emission from W 64+ , we have observed several innershell collisional satellite lines associated with oxygenlike W 66+ , fluorinelike W 65+ , sodiumlike W 63+ , and magnesiumlike W 62+ , which provide benchmarks for future calculations as well as for recent calculations using the relativistic many-body perturbation theory. The present measurements also provide accurate rest wavelengths for establishing the instrumental dispersion needed for future measurements of the core plasma motion in the ITER tokamak and show that the candidate W 64+ line for such measurements remains well isolated from neighboring collisional satellite lines even when broadened by the expected, high temperatures in this device.

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confidence: 99%

L-shell x-ray emission from neonlike W64+

et al. 2012

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“…It was shown before that the addition of Al wire(s) substantially changes the radiative properties of W plasmas and in particular results in producing better quality and higher resolution M-shell W spectra. [21][22] X-ray axially resolved film from Zebra shot 2455 with cathode at the top and anode at the bottom and the corresponding lineout taken near the cathode from the brightest spot are shown in Fig. 4 (d) and (c), respectively.…”

Section: Single Planar Wire Arraysmentioning

confidence: 99%

Radiative signatures of Z-pinch plasmas at UNR: from X-pinches to wire arrays

Safronova

Kantsyrev

Esaulov

et al. 2014

Int. J. Mod. Phys. Conf. Ser.

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University-scale Z-pinch generators are able to produce High Energy Density (HED) plasmas in a broad range of plasma parameters under well-controlled and monitored experimental conditions suitable for radiation studies. The implosion of X-pinch and wire array loads at a 1 MA generator yields short (1-20 nsec) x-ray bursts from one or several bright plasma spots near the wire cross point (for X-pinches) or along and near Z-pinch axis (for wire arrays). Such X- and Z-pinch HED plasma with scales from a few µm to several mm in size emits radiation in a broad range of energies from 10 eV to 0.5 MeV and is subject of our studies during the last ten years. In particular, the substantial number of experiments with very different wire loads was performed on the 1 MA Zebra generator and analyzed: X-pinch, cylindrical, nested, and various types of the novel load, Planar Wire Arrays (PWA). Also, the experiments at an enhanced current of 1.5-1.7 MA on Zebra using Load Current Multiplier (LCM) were performed. This paper highlights radiative signatures of X-pinches and Single and Double PWAs which are illustrated using the new results with combined wire loads from two different materials.

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“…Radiative properties of uniform (from one wire material) 2-and 4-wire Xpinches from Al5056, Ti, SS304, Cu, and Mo were studied [4,6,8]. The load masses varied from 100 µg (Ti X-pinch) up to 3 mg (Cu X-pinch).…”

Section: X-pinchesmentioning

confidence: 99%