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Title: K-shell and extreme ultraviolet spectroscopic signatures of structured Ar puff Z-pinch loads with high K-shell x-ray yield

Abstract

Structured 12-cm-diam Ar gas-puff loads have recently produced Z-pinch implosions with reduced Rayleigh-Taylor instability growth and increased K-shell x-ray yield [H. Sze, J. Banister, B. H. Failor, J. S. Levine, N. Qi, A. L. Velikovich, J. Davis, D. Lojewski, and P. Sincerny, Phys. Rev. Lett. 95, 105001 (2005)]. To better understand the dynamics of these loads, we have measured the extreme ultraviolet (XUV) emission resolved radially, spectrally, and axially. Radial measurements indicated a compressed diameter of {approx_equal}3 mm, consistent with the observed load inductance change and an imploded-mass consisting of a {approx_equal}1.5-mm-diam, hot, K-shell-emitting core and a cooler surrounding blanket. Spectral measurements indicate that, if the load is insufficiently heated, then radiation from the core will rapidly photoheat the outer blanket, producing a strong increase in XUV emission. Also, adding a massive center jet ({>=}20% of load mass) increases the rise and fall times of the XUV emission to {>=}40 ns, consistent with a more adiabatic compression and heating of the load. Axial measurements show that, despite differences in the XUV and K-shell emission time histories, the K-shell x-ray yield is insensitive to axial variations in load mass.

Authors:
; ; ; ; ; ;  [1]
  1. L-3 Communications/Pulse Sciences, San Leandro, California 94577 (United States)
Publication Date:
OSTI Identifier:
20976596
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 14; Journal Issue: 2; Other Information: DOI: 10.1063/1.2426919; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ARGON; EMISSION; EXTREME ULTRAVIOLET RADIATION; INDUCTANCE; K SHELL; MASS; PLASMA; PLASMA HEATING; RAYLEIGH-TAYLOR INSTABILITY; VARIATIONS; X RADIATION; YIELDS

Citation Formats

Failor, B H, Sze, H M, Banister, J W, Levine, J S, Qi, N, Apruzese, J P, Lojewski, D Y, Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375, and Defense Threat Reduction Agency, Albuquerque, New Mexico 87117. K-shell and extreme ultraviolet spectroscopic signatures of structured Ar puff Z-pinch loads with high K-shell x-ray yield. United States: N. p., 2007. Web. doi:10.1063/1.2426919.
Failor, B H, Sze, H M, Banister, J W, Levine, J S, Qi, N, Apruzese, J P, Lojewski, D Y, Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375, & Defense Threat Reduction Agency, Albuquerque, New Mexico 87117. K-shell and extreme ultraviolet spectroscopic signatures of structured Ar puff Z-pinch loads with high K-shell x-ray yield. United States. doi:10.1063/1.2426919.
Failor, B H, Sze, H M, Banister, J W, Levine, J S, Qi, N, Apruzese, J P, Lojewski, D Y, Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375, and Defense Threat Reduction Agency, Albuquerque, New Mexico 87117. Thu . "K-shell and extreme ultraviolet spectroscopic signatures of structured Ar puff Z-pinch loads with high K-shell x-ray yield". United States. doi:10.1063/1.2426919.
@article{osti_20976596,
title = {K-shell and extreme ultraviolet spectroscopic signatures of structured Ar puff Z-pinch loads with high K-shell x-ray yield},
author = {Failor, B H and Sze, H M and Banister, J W and Levine, J S and Qi, N and Apruzese, J P and Lojewski, D Y and Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375 and Defense Threat Reduction Agency, Albuquerque, New Mexico 87117},
abstractNote = {Structured 12-cm-diam Ar gas-puff loads have recently produced Z-pinch implosions with reduced Rayleigh-Taylor instability growth and increased K-shell x-ray yield [H. Sze, J. Banister, B. H. Failor, J. S. Levine, N. Qi, A. L. Velikovich, J. Davis, D. Lojewski, and P. Sincerny, Phys. Rev. Lett. 95, 105001 (2005)]. To better understand the dynamics of these loads, we have measured the extreme ultraviolet (XUV) emission resolved radially, spectrally, and axially. Radial measurements indicated a compressed diameter of {approx_equal}3 mm, consistent with the observed load inductance change and an imploded-mass consisting of a {approx_equal}1.5-mm-diam, hot, K-shell-emitting core and a cooler surrounding blanket. Spectral measurements indicate that, if the load is insufficiently heated, then radiation from the core will rapidly photoheat the outer blanket, producing a strong increase in XUV emission. Also, adding a massive center jet ({>=}20% of load mass) increases the rise and fall times of the XUV emission to {>=}40 ns, consistent with a more adiabatic compression and heating of the load. Axial measurements show that, despite differences in the XUV and K-shell emission time histories, the K-shell x-ray yield is insensitive to axial variations in load mass.},
doi = {10.1063/1.2426919},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 2,
volume = 14,
place = {United States},
year = {2007},
month = {2}
}