Author/Authors :
Kuriyama، نويسنده , , M. and Akino، نويسنده , , N. and Aoyagi، نويسنده , , T. and Ebisawa، نويسنده , , N. and Isozaki، نويسنده , , N. and Honda، نويسنده , , A. and Inoue، نويسنده , , T. and Itoh، نويسنده , , T. and Kawai، نويسنده , , M. and Kazawa، نويسنده , , M. and Koizumi، نويسنده , , J. and Mogaki، نويسنده , , K. and Ohara، نويسنده , , Y. and Ohga، نويسنده , , T. and Okumura، نويسنده , , Y. and Oohara، نويسنده , , H. and Ohshima، نويسنده , , K. and Sa?lam، نويسنده ,
Abstract :
A beam injection experiment with the negative-ion based NBI system (N-NBI) started in March 1996 on JT-60U. After achieving the first neutral beam injection of 180 keV, ∼0.1 MW for 0.4 s into the JT-60U plasmas, the operation parameters of the ion source and power supply had been optimized for increasing the beam energy and beam current. In September 1996, a deuterium neutral beam of 2.5 MW at 350 keV was injected into JT-60U using two ion sources. In the operation with hydrogen at the beginning of 1997, a negative ion beam current of 18.4 A at 350 keV has been obtained, and a neutral beam of 3.2 MW at 350 keV for 1 s has been injected into the plasma with one ion source. A neutralization efficiency of negative ion beam has been confirmed to be about 60% at the beam energies of 250–385 keV as predicted theoretically.
