Author/Authors :
KIMURA، H. نويسنده , , Oikawa، T. نويسنده , , Kusama، Y. نويسنده , , Kramer، G.J. نويسنده , , Saigusa، M. نويسنده , , Ozeki، T. نويسنده , , Tobita، K. نويسنده , , Shinohara، K. نويسنده , , Kondoh، T. نويسنده ,
Abstract :
The excitation and stabilization of Alfvén eigenmodes and their impact on energetic ion confinement were investigated with negative ion based neutral beam injection at 330360 keV into weak or reversed magnetic shear plasmas on JT-60U. Toroidicity induced Alfvén eigenmodes (TAEs) were observed in weak shear plasmas with ?bh? ³ 0.1% and 0.4 £ vb||/vA £ 1. The stability of TAEs is consistent with predictions by the NOVA-K code. New burst modes and chirping modes were observed in the higher b regime of ?bh? ³ 0.2%. The effect of TAEs, burst modes and chirping modes on fast ion confinement has been found to be small so far. It was found that a strongly reversed shear plasma with internal transport barrier suppresses AEs.
Keywords :
Helianthus annuus L. , hull-kernel ratio , Pakistan , seed source , seed-kernel ratio
