High beta studies on ISX-B with neutral beam injection

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Injection of H/sup 0/ into D/sup +/ plasmas with beam power P/sub b/ of up to 1.7 MW has produced rms betas of approx. 4%, volume-averaged betas of approx. 3%, and central betas of approx. 10% in the ISX-B tokamak. Although theoretical calculations indicate that the observed equilibria may be unstable to ballooning modes, no catastrophic loss of confinement has been observed, and beta continues to increase with injection power. In these beam-dominated high-beta discharges the electron and ion energy confinement times are still similar to those obtained with ohmic heating: ion energy confinement is neoclassical within a factor of ... continued below

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Pages: 16

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Sheffield, J.; Bates, S.C. & Bush, C.E. January 1, 1980.

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Injection of H/sup 0/ into D/sup +/ plasmas with beam power P/sub b/ of up to 1.7 MW has produced rms betas of approx. 4%, volume-averaged betas of approx. 3%, and central betas of approx. 10% in the ISX-B tokamak. Although theoretical calculations indicate that the observed equilibria may be unstable to ballooning modes, no catastrophic loss of confinement has been observed, and beta continues to increase with injection power. In these beam-dominated high-beta discharges the electron and ion energy confinement times are still similar to those obtained with ohmic heating: ion energy confinement is neoclassical within a factor of approx. 2, and electron energy confinement follows the usual Alcator scaling. In high-power injection discharges the character of the magnetohydrodynamic (MHD) behavior changes, the particle confinement time decreases, and the inward impurity transport appears to be inhibited. These effects, however, may not be linked directly to beta.

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Pages: 16

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NTIS, PC A02/MF A01.

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  • 2. joint Grenoble-Varenna international symposium on heating in toroidal plasmas, Como, Italy, 3 Sep 1980

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  • Report No.: CONF-800932-3
  • Grant Number: W-7405-ENG-26
  • Office of Scientific & Technical Information Report Number: 5125086
  • Archival Resource Key: ark:/67531/metadc1055299

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  • January 1, 1980

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 6:27 p.m.

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Sheffield, J.; Bates, S.C. & Bush, C.E. High beta studies on ISX-B with neutral beam injection, article, January 1, 1980; United States. (digital.library.unt.edu/ark:/67531/metadc1055299/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.