Author/Authors :
Miyazawa، نويسنده , , J and Masuzaki، نويسنده , , S and Yamada، نويسنده , , H and Suzuki، نويسنده , , H and Goto، نويسنده , , M and Morita، نويسنده , , S and Murakami، نويسنده , , S and Narihara، نويسنده , , K and Osakabe، نويسنده , , M and Peterson، نويسنده , , B.J and Sakakibara، نويسنده , , S and Tanaka، نويسنده , , K and Kaneko، نويسنده , , O and Komori، نويسنده , , A and Matsuoka، نويسنده , , K and Motojima، نويسنده , , O، نويسنده ,
Abstract :
Fueling efficiency of gas puffing has been estimated for the net current free plasmas heated by the neutral beam injection in LHD. The particle balance has been analyzed in the latter phase of the density ramp up discharges. The increase rate of the plasma density is correlated to the particle flux of gas puffing alone and not to the other parameters such as the recycling flux, at that phase. The fueling efficiency of 12% has been obtained with this method. The fueling efficiency obtained by this method is insensitive to the heating power or the existence of the magnetic island.
Keywords :
recycling , Fueling efficiency , Gas puffing , Large helical device , Particle balance , Density control
