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Title: Radiative Properties, Structure, and Dynamics of Asymmetric and Symmetric, Uniform and Combined X-Pinches on 1MA Zebra Generator

Abstract

Experimental results of studies of the 1MA symmetric and asymmetric, uniform stainless steel, Cu, Mo, combined Al/Mo, Mo/Al, Al/W, W/Al, and Mo/W X-pinches are presented. Implosions of X-pinches are studied by spatially-resolved and time-gated x-ray imaging, spectroscopy, and laser probing diagnostics. New data for the total radiation yield are obtained. The planar-shape structures of X-pinch plasma and the corresponding electron beam is observed for the most of X-pinches. The effects of generation of hot spots along original wires positions that are cooler than that from the cross-wire region and arc structures from hot spots between wires are found for X-pinches composed from Al, Cu and W wires.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]; ;  [2]
  1. Physics Department, University of Nevada, Reno, Reno, NV 89557 (United States)
  2. Ktech Corp., Albuquerque, NM 87106 (United States)
Publication Date:
OSTI Identifier:
20729233
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 808; Journal Issue: 1; Conference: 6. international conference on dense Z-pinches, Oxford (United Kingdom), 25-28 Jul 2005; Other Information: DOI: 10.1063/1.2159338; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASYMMETRY; ELECTRON BEAMS; EXPLODING WIRES; HEAT EXCHANGERS; HOT SPOTS; IMPLOSIONS; LASERS; PINCH EFFECT; PLASMA; PLASMA DIAGNOSTICS; STAINLESS STEELS; X RADIATION; X-RAY SPECTROSCOPY; YIELDS

Citation Formats

Kantsyrev, V., Safronova, A., Fedin, D., Ivanov, V., Esaulov, A., Nalajala, V., Shrestha, I., Pokala, S., Ouart, N., Yilmaz, F., Hoppe, T., Laca, P., Astanovitsky, A., Batie, S., LeGalloudec, B., Cowan, T., Sarkisov, G., and Gradel, J. Radiative Properties, Structure, and Dynamics of Asymmetric and Symmetric, Uniform and Combined X-Pinches on 1MA Zebra Generator. United States: N. p., 2006. Web. doi:10.1063/1.2159338.
Kantsyrev, V., Safronova, A., Fedin, D., Ivanov, V., Esaulov, A., Nalajala, V., Shrestha, I., Pokala, S., Ouart, N., Yilmaz, F., Hoppe, T., Laca, P., Astanovitsky, A., Batie, S., LeGalloudec, B., Cowan, T., Sarkisov, G., & Gradel, J. Radiative Properties, Structure, and Dynamics of Asymmetric and Symmetric, Uniform and Combined X-Pinches on 1MA Zebra Generator. United States. doi:10.1063/1.2159338.
Kantsyrev, V., Safronova, A., Fedin, D., Ivanov, V., Esaulov, A., Nalajala, V., Shrestha, I., Pokala, S., Ouart, N., Yilmaz, F., Hoppe, T., Laca, P., Astanovitsky, A., Batie, S., LeGalloudec, B., Cowan, T., Sarkisov, G., and Gradel, J. Thu . "Radiative Properties, Structure, and Dynamics of Asymmetric and Symmetric, Uniform and Combined X-Pinches on 1MA Zebra Generator". United States. doi:10.1063/1.2159338.
@article{osti_20729233,
title = {Radiative Properties, Structure, and Dynamics of Asymmetric and Symmetric, Uniform and Combined X-Pinches on 1MA Zebra Generator},
author = {Kantsyrev, V. and Safronova, A. and Fedin, D. and Ivanov, V. and Esaulov, A. and Nalajala, V. and Shrestha, I. and Pokala, S. and Ouart, N. and Yilmaz, F. and Hoppe, T. and Laca, P. and Astanovitsky, A. and Batie, S. and LeGalloudec, B. and Cowan, T. and Sarkisov, G. and Gradel, J.},
abstractNote = {Experimental results of studies of the 1MA symmetric and asymmetric, uniform stainless steel, Cu, Mo, combined Al/Mo, Mo/Al, Al/W, W/Al, and Mo/W X-pinches are presented. Implosions of X-pinches are studied by spatially-resolved and time-gated x-ray imaging, spectroscopy, and laser probing diagnostics. New data for the total radiation yield are obtained. The planar-shape structures of X-pinch plasma and the corresponding electron beam is observed for the most of X-pinches. The effects of generation of hot spots along original wires positions that are cooler than that from the cross-wire region and arc structures from hot spots between wires are found for X-pinches composed from Al, Cu and W wires.},
doi = {10.1063/1.2159338},
journal = {AIP Conference Proceedings},
number = 1,
volume = 808,
place = {United States},
year = {Thu Jan 05 00:00:00 EST 2006},
month = {Thu Jan 05 00:00:00 EST 2006}
}
  • No abstract prepared.
  • No abstract prepared.
  • The study of implosion dynamics and spectroscopy of X-pinches and wire arrays with Al wires alloyed or coated with other near-Z or higher-Z materials is discussed. In particular, X-pinches from two combined Al 5056 and Mo wires and composed from four identical Al 5056 (5%Mg) wires and Cu clad Al (90% Al and 10%Cu) are studied. In addition, wire arrays with Alumel wires (95% Ni and 5% Al) and with Al 5056 wires (uncoated) and coated with 5% NaF are investigated. Spatially-resolved and integrated x-ray spectral data and time integrated and time-gated pinhole x-ray images accumulated in these X-pinch andmore » wire array experiments on the UNR 1MA Zebra generator are analyzed. Modeling of K-shell radiation from Mg provides K-shell plasma parameters for all Al 5056 wire experiments, whereas modeling of L-shell radiation from Ni, Cu, and Mo provide parameters for L-shell plasmas. The importance of using different materials or dopants for understanding of implosion dynamics of different wire materials is illustrated.« less
  • X-pinch experiments using combined Mo and W wires were implemented on the 1MA Cornell University (CU) COBRA and University of Nevada, Reno (UNR) ZEBRA facilities. Spatially-resolved and integrated x-ray spectral data and time integrated and time-gated pinhole x-ray images accumulated in these X-pinch experiments are analyzed. In particular, x-ray L-shell spectra of Mo ions and M-shell spectra of W ions have been studied. A non-LTE collisional-radiative (CR) atomic kinetic model of Mo, successfully applied before to interpret UNR and CU x-ray spectra from Mo X-pinches, was used here to provide plasma parameters from L-shell Mo radiation from the combined (W/Mo)more » X-pinches. The recently developed non-LTE CR model of W based on FAC atomic structure code data has been applied to identify and diagnose the spectral features of W ions and to provide parameters of the plasma from M-shell W radiation from W/Mo X-pinches. As a result, the radiative properties of W/Mo X-pinches produced on two 1 MA university-scale pulsed power facilities are analyzed and compared.« less
  • Star-like wire arrays and small-diameter (1-3 mm in diameter) cylindrical loads were tested in the 1-MA Zebra generator. Mitigation of plasma inhomogeneity was observed in the implosions of star-like loads, which consisted of multiple nested, cylindrical arrays aligned azimuthally such that the wires appear as linear array 'rays' extending from the axis of symmetry. The implosion in these loads is directed along the 'rays' of the star and cascades from wire to wire to the center to form moving plasma columns with smooth leading edges. Despite the low azimuthal symmetry, a star-like wire array produces a stable x-ray pulse withmore » a high peak power and a short duration of 8-12-ns. This can be linked to the stabilization of instabilities due to the multiple nesting. X-ray generation and implosion dynamics in wire arrays 1-16 mm in diameter were investigated to find a transition between the regime with prevailing kinetic energy and 'non-kinetic' plasma heating. Loads 3-8 mm in diameter generate the highest x-ray power at the Zebra generator. The fall of x-ray power in 1-2-mm loads can be linked to the lack of kinetic energy. Laser probing diagnostics show the formation of 'necks' on the pinch during the bubble-like implosion. The energy balance provides the evidence of the enhanced plasma heating in z-pinches. Features of the implosions in small-diameter wire-arrays can help to identify the mechanisms of energy dissipation.« less