Stability of spheromaks compressed by liquid walls

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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 ... continued below

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75 Kilobytes pages

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Fowler, T K August 17, 1999.

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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.

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75 Kilobytes pages

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  • Other Information: PBD: 17 Aug 1999

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  • Report No.: UCRL-ID-135551
  • Report No.: AT5015020
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/13774 | External Link
  • Office of Scientific & Technical Information Report Number: 13774
  • Archival Resource Key: ark:/67531/metadc621262

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  • August 17, 1999

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  • June 16, 2015, 7:43 a.m.

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  • May 6, 2016, 2:59 p.m.

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Fowler, T K. Stability of spheromaks compressed by liquid walls, report, August 17, 1999; California. (digital.library.unt.edu/ark:/67531/metadc621262/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.