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

[摘要] 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.

[发布日期] 2002-10-15 [发布机构] Princeton University. Plasma Physics Laboratory.

[关键词] National Spherical Torus Experiment;Spherical Tokamak;Quiescent Plasma Neutral Beam Injection;75 Condensed Matter Physics, Superconductivity And Superfluidity;70 Plasma Physics And Fusion Technology