Wall-confined high beta spheromak

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Description

The spheromak could be extended into the high beta regime by supporting the pressure on flux-conserving walls, allowing the plasma to be in a Taylor state with zero pressure gradient and thus stable to ideal and resistive MHD. The concept yields a potentially attractive, pulsed reactor which would require no external magnets. The flux conserver would be shaped to be stable to the tilt and shift instabilities. We envision a plasma which is ohmically ignited at low beta, with the kinetic pressure growing to beta > 1 by fueling from the edge. The flux conserver would be designed such that ... continued below

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8 p.

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Fowler, T.K.; Hopper, E.B.; Moir, R.W. & Pearlstein, L.D. March 16, 1998.

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Description

The spheromak could be extended into the high beta regime by supporting the pressure on flux-conserving walls, allowing the plasma to be in a Taylor state with zero pressure gradient and thus stable to ideal and resistive MHD. The concept yields a potentially attractive, pulsed reactor which would require no external magnets. The flux conserver would be shaped to be stable to the tilt and shift instabilities. We envision a plasma which is ohmically ignited at low beta, with the kinetic pressure growing to beta > 1 by fueling from the edge. The flux conserver would be designed such that the magnetic decay time = the fusion burn time. The thermal capacity of the flux conserver and blanket would exceed the fusion yield per discharge, so that they can be cooled steadily. Ignition is estimated to require minimum technology: 30-100 MJ of pulsed power applied at a 0.5 GW rate generates an estimated bum yield > 1 GJ. The concept thus provides an alternate route to a fusion plasma that is MHD stable at high beta, yielding a reactor that is simple and cheap. The major confinement issue is transport due to grad(T), e.g. driven by high beta modes related to the ITG instability.

Physical Description

8 p.

Notes

INIS; OSTI as DE98057458

Other: FDE: PDF; PL:

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  • US-Japan workshop physics base on DHe3 fusion, Seattle, WA (United States), 18-20 Mar 1998

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  • Other: DE98057458
  • Report No.: UCRL-JC--130151
  • Report No.: CONF-980399--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 300044
  • Archival Resource Key: ark:/67531/metadc676147

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  • March 16, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 6, 2017, 6:10 p.m.

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Fowler, T.K.; Hopper, E.B.; Moir, R.W. & Pearlstein, L.D. Wall-confined high beta spheromak, article, March 16, 1998; California. (digital.library.unt.edu/ark:/67531/metadc676147/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.