Monochromatic soft X-ray self-emission imaging in dense Z pinches

被引：0
|
作者：
Jones, B. [1 ]
Deeney, C. [1 ,3 ]
Meyer, C. J. [2 ]
Coverdale, C. A. [1 ]
LePell, P. D. [2 ]
Apruzese, J. P. [4 ]
Clark, R. W. [4 ]
Davis, J. [4 ]
Peterson, K. J.
机构：
[1] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA
[2] Ktech Corp Inc, Albuquerque, NM 87123 USA
[3] Natl Nucl Secur Adm, Washington, DC 20585 USA
[4] US Navy, Res Lab, Washington, DC 20375 USA
来源：
ATOMIC PROCESSES IN PLASMAS | 2007年 / 926卷
基金：
美国国家科学基金会;
关键词：
x-ray imaging; plasma diagnostics; wire array Z pinch; multilayer mirror;
D O I：
暂无
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
The Z machine at Sandia National Laboratories drives 20 MA in 100 ns through a cylindrical array of fine wires which implodes due to the strong j x B force, generating up to 250 TW of soft x-ray radiation when the z-pinch plasma stagnates on axis. The copious broadband self-emission makes the dynamics of the implosion well suited to diagnosis with soft x-ray imaging and spectroscopy. A monochromatic self-emission imaging instrument has recently been developed on Z which reflects pinhole images from a multilayer mirror onto a I ns gated microchannel plate detector. The multilayer can be designed to provide narrowband (similar to 10 eV) reflection in the 100-700 eV photon energy range, allowing observation of the soft emission from acereting mass as it assembles into a hot, dense plasma column on the array axis. In the present instrument configuration, data at 277 eV photon energy have been obtained for plasmas ranging from Al to W, and the z-pinch implosion and stagnation will be discussed along with > I keV self-emission imaging and spectroscopy. Collisional-radiative simulations are currently being pursued in order to link the imaged emissivity to plasma temperature and density profiles and address the role of opacity in interpreting the data.
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页码：229 / +
页数：3
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