Design of a spheromak compressor driven by high explosives

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High energy density spheromaks can be used to accelerate a thin section of the flux conserver wall to high velocities. The energy density of a spheromak, formed by conventional helicity injection into a flux conserver, can be increased by reducing the flux conserver volume after the spheromak is formed. A method of accomplishing this is by imploding one wall of the flux conserver with high explosives. The velocity of a wall driven by high explosives is about 3--5 km/sec, which is not exceptionally fast. Magnetic equilibrium calculations show that for some imploding flux conserver geometries, the energy density of the ... continued below

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Henins, I.; Fernandez, J.C.; Jarboe, T.R.; Marsh, S.P.; Marklin, G.J.; Mayo, R.M. et al. January 1, 1989.

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High energy density spheromaks can be used to accelerate a thin section of the flux conserver wall to high velocities. The energy density of a spheromak, formed by conventional helicity injection into a flux conserver, can be increased by reducing the flux conserver volume after the spheromak is formed. A method of accomplishing this is by imploding one wall of the flux conserver with high explosives. The velocity of a wall driven by high explosives is about 3--5 km/sec, which is not exceptionally fast. Magnetic equilibrium calculations show that for some imploding flux conserver geometries, the energy density of the spheromak can be suddenly increased on an Alfven time scale by the tendency of the spheromak to maintain a state of minimum energy per unit helicity, which is equivalent to minimizing {lambda} = {mu}{sub 0}j/B. In this process, as the initial flux conserver dimensions are reduced under the explosive drive, the characteristic {lambda} of the configuration increases. Then, if there is an attached flux conserver region whose dimensions are such that its {lambda} becomes lower than for the imploding region, the spheromak will quickly transfer to this region, even if its volume is smaller, thus increasing the energy per unit volume. We call this the natural switching'' feature of spheromaks. The simplest such geometry is a cylindrical flux conserver with one end being driven by high explosives. An attached, smaller-diameter on-axis cylinder has a thin end wall which is accelerated when the spheromak switches into the smaller cylinder. 2 refs., 2 figs.

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Pages: (5 p)

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NTIS, PC A02/MF A01 - OSTI; GPO Dep.

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  • 11. US/Japan workshop on field-reversed configurations and compact toroids, Los Alamos, NM (USA), 7-9 Nov 1989

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  • Other: DE90003652
  • Report No.: LA-UR-89-4006
  • Report No.: CONF-8911130--8
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5167829
  • Archival Resource Key: ark:/67531/metadc1054773

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  • January 1, 1989

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 7:03 p.m.

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Henins, I.; Fernandez, J.C.; Jarboe, T.R.; Marsh, S.P.; Marklin, G.J.; Mayo, R.M. et al. Design of a spheromak compressor driven by high explosives, article, January 1, 1989; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1054773/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.