Title :
Simulation of High-Harmonic Fast-Wave Heating on the National Spherical Tokamak Experiment
Author :
Green, David L. ; Jaeger, Erwin F. ; Chen, Guangye ; Berry, Lee A. ; Pugmire, David ; Canik, John M. ; Ryan, Philip M.
Author_Institution :
Fusion Energy Div., Oak Ridge Nat. Lab., Oak Ridge, TN, USA
Abstract :
Images associated with radio-frequency heating of low-confinement mode plasmas in the National Spherical Tokamak Experiment, as calculated by computer simulation, are presented. The AORSA code has been extended to simulate the whole antenna-to-plasma heating system by including both the kinetic physics of the well-confined core plasma and a poorly confined scrape-off plasma and vacuum vessel structure. The images presented show the 3-D electric wave field amplitude for various antenna phasings. Visualization of the simulation results in 3-D makes clear that -30° phasing excites kilo-volt per meter coaxial standing modes in the scrape-off plasma and shows magnetic-field-aligned whispering-gallery type modes localized to the plasma edge.
Keywords :
Tokamak devices; antennas in plasma; plasma diagnostics; plasma instability; plasma radiofrequency heating; plasma simulation; plasma toroidal confinement; 3-D electric wave field amplitude; AORSA code; antenna phasings; coaxial standing modes; computer simulation; core plasma; high-harmonic fast-wave heating; low-confinement mode plasmas; magnetic-field-aligned whispering-gallery type modes; national spherical tokamak experiment; radiofrequency heating; scrape-off plasma; vacuum vessel structure; whole antenna-to-plasma heating system; Antennas; Heating; Magnetic cores; Magnetic resonance imaging; Plasmas; Radio frequency; Electromagnetic propagation in plasma media; plasma heating; plasma waves; simulation;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2011.2160370
