Results Of Nstx Heating Experiments
IEEE TRANSACTIONS ON PLASMA SCIENCE(2003)
摘要
The National Spherical Torus Experiment (NSTX) at Princeton University, Princeton, NJ, is designed to assess the potential of the low-aspect-ratio spherical torus concept for magnetic plasma confinement. The plasma has been heated by up to 7 MW of neutral beam injection (NBI) at an injection energy of 100 keV and up to 6 MW of high harmonic fast wave (HHFW) at 30 MHz. NSTX has achieved beta(T) of 32%. A variety of MHD phenomena have been observed to limit,Q. NSTX has now begun addressing tau(E) scaling, beta limits, and current drive issues. During the NBI heating experiments, a broad T-i profile with T-i up to 2 keV, T-i > T-e and a large toroidal rotation were observed. Transport analysis suggests that the impurity ions have diffusivities approaching neoclassical. For L-Mode plasmas, tau(E) is up to two times the ITER97L L-Mode scaling and exceeds the ITER98pby2 H-Mode scaling in some cases. Transitions to H-Mode have been observed which result in an approximate doubling of tau(E), after the transition in some conditions. During HHFW heating, T-e > T-i and T-e up to 3.5 keV were observed. Current drive has been studied using both coaxial helicity injection with up to 390 kA of toroidal current and HHFW HHFW has produced H-modes with significant bootstrap current fraction at low I-p, high q, and high beta(p).
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关键词
fusion reactors, plasma confinement, tokamaks
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