Alpha-driven fast magnetosonic wave heating in tokamak plasmas

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An alpha-driven fast magnetosonic wave instability is investigated in tokamak plasmas for propagation transverse to the external magnetic field at frequencies several times the alpha gyrorate. A two-dimensional differential quasi-linear diffusion equation is derived in cylindrical v/sub perpendicular/ - v/sub parallel/ geometry. The quasi-linear diffusion coefficients in the small parameter k/sub parallel/k/sub perpendicular/ are expanded and the problem is reduced to one dimension by integrating out the v/sub parallel/ dependence. Reactor relevant information is obtained using data from the one-dimensional formulation in a 1-1/2 dimensional tokamak transport code. Contour plots of the alpha threshold fraction are used to identify the ... continued below

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Pages: 5

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Miley, G.H.; Sutton, W.R. III & Sigmar, D.J. January 1, 1985.

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Description

An alpha-driven fast magnetosonic wave instability is investigated in tokamak plasmas for propagation transverse to the external magnetic field at frequencies several times the alpha gyrorate. A two-dimensional differential quasi-linear diffusion equation is derived in cylindrical v/sub perpendicular/ - v/sub parallel/ geometry. The quasi-linear diffusion coefficients in the small parameter k/sub parallel/k/sub perpendicular/ are expanded and the problem is reduced to one dimension by integrating out the v/sub parallel/ dependence. Reactor relevant information is obtained using data from the one-dimensional formulation in a 1-1/2 dimensional tokamak transport code. Contour plots of the alpha threshold fraction are used to identify the instability regions in the n/sub e/-T/sub i/ plane. Alpha/background electron fractions as low as 10/sup -6/ to 10/sup -4/ may trigger the instability. For a typical reactor-size tokamak, an enhancement of the fraction of the alpha energy transferred to ions by as much as 1.5 can occur for T/sub i/ = T/sub e/ at 7 keV. Still, due to the rapid equilibration of electron and ion temperatures, a <1 to 2% increase in fusion power occurs overall.

Physical Description

Pages: 5

Notes

NTIS, PC A02/MF A01.

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  • 12. European conference on controlled fusion and plasma physics, Budapest, Hungary, 2 Sep 1985

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  • Other: DE85014279
  • Report No.: CONF-850927-3
  • Report No.: COO-2218-318
  • Grant Number: AC02-76ET52040
  • Office of Scientific & Technical Information Report Number: 5594877
  • Archival Resource Key: ark:/67531/metadc1093625

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1985

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • March 21, 2018, 1:04 p.m.

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Miley, G.H.; Sutton, W.R. III & Sigmar, D.J. Alpha-driven fast magnetosonic wave heating in tokamak plasmas, article, January 1, 1985; United States. (digital.library.unt.edu/ark:/67531/metadc1093625/: accessed April 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.