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Title: Magnetically-Driven Convergent Instability Growth platform on Z.

Abstract

Hydrodynamic instability growth is a fundamentally limiting process in many applications. In High Energy Density Physics (HEDP) systems such as inertial confinement fusion implosions and stellar explosions, hydro instabilities can dominate the evolution of the object and largely determine the final state achievable. Of particular interest is the process by which instabilities cause perturbations at a density or material interface to grow nonlinearly, introducing vorticity and eventually causing the two species to mix across the interface. Although quantifying instabilities has been the subject of many investigations in planar geometry, few have been done in converging geometry. During FY17, the team executed six convergent geometry instability experiments. Based on earlier results, the platform was redesigned and improved with respect to load centering at installation making the installation reproducible and development of a new 7.2 keV, Co He-a backlighter system to better penetrate the liner. Together, the improvements yielded significantly improved experimental results. The results in FY17 demonstrate the viability of using experiments on Z to quantify instability growth in cylindrically convergent geometry. Going forward, we will continue the partnership with staff and management at LANL to analyze the past experiments, compare to hydrodynamics growth models, and design future experiments.

Authors:
 [1];  [1];  [1];  [1];  [2];  [2]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1398240
Report Number(s):
SAND-2017-10509
657379
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Knapp, Patrick, Mattsson, Thomas, Martin, Matthew, Benage, John F., Jenkins, James, and Albright, Brian James. Magnetically-Driven Convergent Instability Growth platform on Z.. United States: N. p., 2017. Web. doi:10.2172/1398240.
Knapp, Patrick, Mattsson, Thomas, Martin, Matthew, Benage, John F., Jenkins, James, & Albright, Brian James. Magnetically-Driven Convergent Instability Growth platform on Z.. United States. doi:10.2172/1398240.
Knapp, Patrick, Mattsson, Thomas, Martin, Matthew, Benage, John F., Jenkins, James, and Albright, Brian James. Fri . "Magnetically-Driven Convergent Instability Growth platform on Z.". United States. doi:10.2172/1398240. https://www.osti.gov/servlets/purl/1398240.
@article{osti_1398240,
title = {Magnetically-Driven Convergent Instability Growth platform on Z.},
author = {Knapp, Patrick and Mattsson, Thomas and Martin, Matthew and Benage, John F. and Jenkins, James and Albright, Brian James},
abstractNote = {Hydrodynamic instability growth is a fundamentally limiting process in many applications. In High Energy Density Physics (HEDP) systems such as inertial confinement fusion implosions and stellar explosions, hydro instabilities can dominate the evolution of the object and largely determine the final state achievable. Of particular interest is the process by which instabilities cause perturbations at a density or material interface to grow nonlinearly, introducing vorticity and eventually causing the two species to mix across the interface. Although quantifying instabilities has been the subject of many investigations in planar geometry, few have been done in converging geometry. During FY17, the team executed six convergent geometry instability experiments. Based on earlier results, the platform was redesigned and improved with respect to load centering at installation making the installation reproducible and development of a new 7.2 keV, Co He-a backlighter system to better penetrate the liner. Together, the improvements yielded significantly improved experimental results. The results in FY17 demonstrate the viability of using experiments on Z to quantify instability growth in cylindrically convergent geometry. Going forward, we will continue the partnership with staff and management at LANL to analyze the past experiments, compare to hydrodynamics growth models, and design future experiments.},
doi = {10.2172/1398240},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 2017},
month = {Fri Sep 01 00:00:00 EDT 2017}
}

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