Measurements of Prompt and MHD-Induced Fast Ion Loss from National Spherical Torus Experiment Plasmas

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A range of effects may make fast ion confinement in spherical tokamaks worse than in conventional aspect ratio tokamaks. Data from neutron detectors, a neutral particle analyzer, and a fast ion loss diagnostic on the National Spherical Torus Experiment (NSTX) indicate that neutral beam ion confinement is consistent with classical expectations in quiescent plasmas, within the {approx}25% errors of measurement. However, fast ion confinement in NSTX is frequently affected by magnetohydrodynamic (MHD) activity, and the effect of MHD can be quite strong.

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Darrow, D.S.; Medley, S.S.; Roquemore, A.L.; Heidbrink, W.W.; Alekseyev, A.; Cecil, F.E. et al. October 15, 2002.

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A range of effects may make fast ion confinement in spherical tokamaks worse than in conventional aspect ratio tokamaks. Data from neutron detectors, a neutral particle analyzer, and a fast ion loss diagnostic on the National Spherical Torus Experiment (NSTX) indicate that neutral beam ion confinement is consistent with classical expectations in quiescent plasmas, within the {approx}25% errors of measurement. However, fast ion confinement in NSTX is frequently affected by magnetohydrodynamic (MHD) activity, and the effect of MHD can be quite strong.

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1.1 Megabytes pages

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INIS; OSTI as DE00809847

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  • Other Information: PBD: 15 Oct 2002

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  • Report No.: PPPL-3754
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/809847 | External Link
  • Office of Scientific & Technical Information Report Number: 809847
  • Archival Resource Key: ark:/67531/metadc735452

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  • October 15, 2002

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 18, 2016, 1 p.m.

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Darrow, D.S.; Medley, S.S.; Roquemore, A.L.; Heidbrink, W.W.; Alekseyev, A.; Cecil, F.E. et al. Measurements of Prompt and MHD-Induced Fast Ion Loss from National Spherical Torus Experiment Plasmas, report, October 15, 2002; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc735452/: accessed August 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.