Magnetohydrodynamic simulations of noninductive helicity injection in the reversed-field pinch and tokamak

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Numerical computation is used to investigate resistive magnetohydrodynamic (MHD) fluctuations in the reversed-field pinch (RFP) and in tokamak-like configurations driven solely by direct current (DC) helicity injection. A Lundquist number (S) scan of RFP turbulence without plasma pressure produces the weak scaling of S{sup -0.18} for the root-mean-square magnetic fluctuation level for 2.5x10{sup 3}{le}S{le}4x10{sup 4}. The temporal behavior of fluctuations and the reversal parameter becomes more regular as S is increased, acquiring a {open_quotes}sawtooth{close_quotes} shape at the largest value of S. Simulations with plasma pressure and anisotropic thermal conduction demonstrate energy transport resulting from parallel heat fluctuations. To investigate means ... continued below

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Medium: P; Size: 104 p.

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Sovinec, C.R. December 31, 1995.

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Numerical computation is used to investigate resistive magnetohydrodynamic (MHD) fluctuations in the reversed-field pinch (RFP) and in tokamak-like configurations driven solely by direct current (DC) helicity injection. A Lundquist number (S) scan of RFP turbulence without plasma pressure produces the weak scaling of S{sup -0.18} for the root-mean-square magnetic fluctuation level for 2.5x10{sup 3}{le}S{le}4x10{sup 4}. The temporal behavior of fluctuations and the reversal parameter becomes more regular as S is increased, acquiring a {open_quotes}sawtooth{close_quotes} shape at the largest value of S. Simulations with plasma pressure and anisotropic thermal conduction demonstrate energy transport resulting from parallel heat fluctuations. To investigate means of improving RFP energy confinement, three forms of current profile modification are tested. Radio frequency (RF) current drive is modeled with an auxiliary electron force, and linear stability calculations are used.

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Medium: P; Size: 104 p.

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INIS; OSTI as DE96005635

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  • Other Information: TH: Thesis (Ph.D.)

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  • Other: DE96005635
  • Report No.: DOE/ER/53212--270
  • Grant Number: FG02-85ER53212
  • Office of Scientific & Technical Information Report Number: 184289
  • Archival Resource Key: ark:/67531/metadc671703

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  • December 31, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 2, 2015, 5:07 p.m.

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Sovinec, C.R. Magnetohydrodynamic simulations of noninductive helicity injection in the reversed-field pinch and tokamak, thesis or dissertation, December 31, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc671703/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.