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Title: Stability of spheromaks compressed by liquid walls

Abstract

We consider Rayleigh-Taylor instability of the liquid-plasma interface of a spheromak ignited by slow compression discussed previously. We conclude that instability may indeed occur despite the stabilizing influence of magnetic shear in the spheromak. If it occurs, instability would be greatest for modes concentrated toward the midplane. As for the cylindrical LINUS configuration, rotation about the geometric axis would stabilize these modes, but at the price of roughly doubling the input energy and reducing the gain. However, even in the absence of rotation, in a sphere instability occurs only at the end of compression near the stagnation point. Revised estimates of the fusion energy gain taking this brief period of instability into account still give, within the uncertainties, a gain G {approx} 20 for our earlier example with an input energy of 150 MJ and fusion yield of 3 GJ.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
USDOE Office of Defense Programs (DP) (US)
OSTI Identifier:
13774
Report Number(s):
UCRL-ID-135551; AT5015020
AT5015020; TRN: US0110749
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 17 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; SPHEROMAK DEVICES; FUSION YIELD; RAYLEIGH-TAYLOR INSTABILITY; STAGNATION POINT; IGNITION; COMPRESSION

Citation Formats

Fowler, T K. Stability of spheromaks compressed by liquid walls. United States: N. p., 1999. Web. doi:10.2172/13774.
Fowler, T K. Stability of spheromaks compressed by liquid walls. United States. doi:10.2172/13774.
Fowler, T K. Tue . "Stability of spheromaks compressed by liquid walls". United States. doi:10.2172/13774. https://www.osti.gov/servlets/purl/13774.
@article{osti_13774,
title = {Stability of spheromaks compressed by liquid walls},
author = {Fowler, T K},
abstractNote = {We consider Rayleigh-Taylor instability of the liquid-plasma interface of a spheromak ignited by slow compression discussed previously. We conclude that instability may indeed occur despite the stabilizing influence of magnetic shear in the spheromak. If it occurs, instability would be greatest for modes concentrated toward the midplane. As for the cylindrical LINUS configuration, rotation about the geometric axis would stabilize these modes, but at the price of roughly doubling the input energy and reducing the gain. However, even in the absence of rotation, in a sphere instability occurs only at the end of compression near the stagnation point. Revised estimates of the fusion energy gain taking this brief period of instability into account still give, within the uncertainties, a gain G {approx} 20 for our earlier example with an input energy of 150 MJ and fusion yield of 3 GJ.},
doi = {10.2172/13774},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {8}
}

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