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Title: Planar wire array performance scaling at multi-MA levels on the Saturn generator.

Abstract

A series of twelve shots were performed on the Saturn generator in order to conduct an initial evaluation of the planar wire array z-pinch concept at multi-MA current levels. Planar wire arrays, in which all wires lie in a single plane, could offer advantages over standard cylindrical wire arrays for driving hohlraums for inertial confinement fusion studies as the surface area of the electrodes in the load region (which serve as hohlraum walls) may be substantially reduced. In these experiments, mass and array width scans were performed using tungsten wires. A maximum total radiated x-ray power of 10 {+-} 2 TW was observed with 20 mm wide arrays imploding in {approx}100 ns at a load current of {approx}3 MA, limited by the high inductance. Decreased power in the 4-6 TW range was observed at the smallest width studied (8 mm). 10 kJ of Al K-shell x-rays were obtained in one Al planar array fielded. This report will discuss the zero-dimensional calculations used to design the loads, the results of the experiments, and potential future research to determine if planar wire arrays will continue to scale favorably at current levels typical of the Z machine. Implosion dynamics will be discussed, includingmore » x-ray self-emission imaging used to infer the velocity of the implosion front and the potential role of trailing mass. Resistive heating has been previously cited as the cause for enhanced yields observed in excess of jxB-coupled energy. The analysis presented in this report suggests that jxB-coupled energy may explain as much as the energy in the first x-ray pulse but not the total yield, which is similar to our present understanding of cylindrical wire array behavior.« less

Authors:
 [1]; ; ; ;  [2]; ;  [2]; ;  [3]; ; ;  [2]
  1. Laboratoire du Centre National de la Recherche Scientifique Ecole Polytechnique, Palaiseau, France
  2. University of Nevada, Reno, NV
  3. Icarus Research Inc., Bethesda, MD
Publication Date:
Research Org.:
Sandia National Laboratories
Sponsoring Org.:
USDOE
OSTI Identifier:
920806
Report Number(s):
SAND2007-6337
TRN: US0800956
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DESIGN; ELECTRODES; EVALUATION; HEATING; IMPLOSIONS; INDUCTANCE; INERTIAL CONFINEMENT; K SHELL; PERFORMANCE; SURFACE AREA; TUNGSTEN; VELOCITY; X-rays-Measurement.; Planar transisters.; Arrays.

Citation Formats

Chuvatin, Alexander S, Jones, Michael, Vesey, Roger Alan, Waisman, Eduardo M, Esaulov, Andrey A, Ampleford, David J, Kantsyrev, Victor Leonidovich, Cuneo, Michael Edward, Rudakov, L I, Coverdale, Christine Anne, Jones, Brent Manley, and Safronova, Alla S. Planar wire array performance scaling at multi-MA levels on the Saturn generator.. United States: N. p., 2007. Web. doi:10.2172/920806.
Chuvatin, Alexander S, Jones, Michael, Vesey, Roger Alan, Waisman, Eduardo M, Esaulov, Andrey A, Ampleford, David J, Kantsyrev, Victor Leonidovich, Cuneo, Michael Edward, Rudakov, L I, Coverdale, Christine Anne, Jones, Brent Manley, & Safronova, Alla S. Planar wire array performance scaling at multi-MA levels on the Saturn generator.. United States. doi:10.2172/920806.
Chuvatin, Alexander S, Jones, Michael, Vesey, Roger Alan, Waisman, Eduardo M, Esaulov, Andrey A, Ampleford, David J, Kantsyrev, Victor Leonidovich, Cuneo, Michael Edward, Rudakov, L I, Coverdale, Christine Anne, Jones, Brent Manley, and Safronova, Alla S. Mon . "Planar wire array performance scaling at multi-MA levels on the Saturn generator.". United States. doi:10.2172/920806. https://www.osti.gov/servlets/purl/920806.
@article{osti_920806,
title = {Planar wire array performance scaling at multi-MA levels on the Saturn generator.},
author = {Chuvatin, Alexander S and Jones, Michael and Vesey, Roger Alan and Waisman, Eduardo M and Esaulov, Andrey A and Ampleford, David J and Kantsyrev, Victor Leonidovich and Cuneo, Michael Edward and Rudakov, L I and Coverdale, Christine Anne and Jones, Brent Manley and Safronova, Alla S},
abstractNote = {A series of twelve shots were performed on the Saturn generator in order to conduct an initial evaluation of the planar wire array z-pinch concept at multi-MA current levels. Planar wire arrays, in which all wires lie in a single plane, could offer advantages over standard cylindrical wire arrays for driving hohlraums for inertial confinement fusion studies as the surface area of the electrodes in the load region (which serve as hohlraum walls) may be substantially reduced. In these experiments, mass and array width scans were performed using tungsten wires. A maximum total radiated x-ray power of 10 {+-} 2 TW was observed with 20 mm wide arrays imploding in {approx}100 ns at a load current of {approx}3 MA, limited by the high inductance. Decreased power in the 4-6 TW range was observed at the smallest width studied (8 mm). 10 kJ of Al K-shell x-rays were obtained in one Al planar array fielded. This report will discuss the zero-dimensional calculations used to design the loads, the results of the experiments, and potential future research to determine if planar wire arrays will continue to scale favorably at current levels typical of the Z machine. Implosion dynamics will be discussed, including x-ray self-emission imaging used to infer the velocity of the implosion front and the potential role of trailing mass. Resistive heating has been previously cited as the cause for enhanced yields observed in excess of jxB-coupled energy. The analysis presented in this report suggests that jxB-coupled energy may explain as much as the energy in the first x-ray pulse but not the total yield, which is similar to our present understanding of cylindrical wire array behavior.},
doi = {10.2172/920806},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Oct 01 00:00:00 EDT 2007},
month = {Mon Oct 01 00:00:00 EDT 2007}
}

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