Study of combined NBI and ICRF enhancement of the D-<sup>3</sup>He fusion yield with a Fokker-Planck code
M. Yamagiwa; Y. Kishimoto; T. Fujii; H. Kimura; M. Yamagiwa; Naka Fusion Res. Establ., JAERI, Ibaraki, Japan; Y. Kishimoto; Naka Fusion Res. Establ., JAERI, Ibaraki, Japan; T. Fujii; Naka Fusion Res. Establ., JAERI, Ibaraki, Japan; H. Kimura; Naka Fusion Res. Establ., JAERI, Ibaraki, Japan
Журнал:
Nuclear Fusion
Дата:
1993-03-01
Аннотация:
A two-dimensional bounce averaged Fokker-Planck code is used to study the fusion yield and the wave absorption by residual hydrogen ions in higher harmonic ICRF heating of D (120 keV) and <sup>3</sup>He (80 keV) beams in the JT-60U tokamak. Both for the fourth harmonic resonance of <sup>3</sup>He (ω = 4ω<sub>c<sup>3</sup>He</sub>(0), which is accompanied by the third harmonic resonance of hydrogen (ω = 3ω<sub>cH</sub>) at the low field side, and for the third harmonic resonance of <sup>3</sup>He (ω = 4ω<sub>cD</sub>(0) = 3ω<sub>c<sup>3</sup>He</sub>(0)) = 2ω<sub>cH</sub>(0)), a few per cent of hydrogen ions are found to absorb a large fraction of the ICRF power and to degrade the fusion output power. In the latter case, D beam acceleration due to the fourth harmonic resonance in the <sup>3</sup>He(D) regime can enhance the fusion yield more effectively. A discussion is given of the effect of D beam acceleration due to the fifth harmonic resonance (ω = 5ω<sub>cD</sub>) at the high field side in the case of ω = 4ω<sub>c<sup>3</sup>He</sub>(0) and of the optimization of the fusion yield in the case of lower electron density and higher electron temperature
562.9Кб