부산대학교 도서관

Using off-axis electron cyclotron current drive (ECCD), self-consistent integrated advanced tokamak operation has been demonstrated on DIII-D [Plasma Physics and Controlled Nuclear Fusion Research, 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. I, p. 159], combining high beta; (>3%) at high q (q[SUBmin] > 2.0) with good energy confinement (H[SUB89] ∼ 2.5) and high noninductive current fraction (f[SUBBS] ∼55%,f[SUBNI] ∼ 90%). Modification of the current profile by ECCD led to internal transport barrier formation even in the presence of type I edge localized modes. Improvements were observed in all transport channels, and increased peaking of profiles led to higher bootstrap current in the core. Separate experiments have shown the ability to maintain a nearly steady-state current profile for up to 1 s with q[SUBmin] > 1.5. Modeling indicates that this favorable current profile can be maintained indefinitely at a higher β[SUBN] using tools available to the near-term DIII-D program. Modeling and simulation have become essential tools for the experimental program in interpreting the data and developing detail plans for new experiments. [ABSTRACT FROM AUTHOR]