Download or read book Comparisons of Small Edge Localized Mode H-Mode Regimes on the Alcator C-Mod and JFT-2M Tokamaks written by Amanda E. Hubbard and published by . This book was released on 2005 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comparisons of H-mode regimes were carried out on the Alcator C-Mod and JFT-2M tokamaks. Shapes were matched apart from aspect ratio, which is lower on C-Mod. The High Recycling Steady (HRS) H-mode on JFT-2M and Enhanced D-alpha (EDA) regime on C-Mod, which both feature very small or no ELMs, are found to have similar access conditions in q95-nu* space, occurring for pedestal collisionality nu* greater than 1. Differences in edge fluctuations were found, with lower frequencies but higher mode numbers on C-Mod. In both tokamaks an attractive regime with small ELMs on top of an enhanced D-alpha baseline was obtained at moderate nu* and higher pressure. The JFT-2M shape favoured the appearance of ELMs on C-Mod, and also resulted in the appearance of a lower frequency component of the quasicoherent mode during EDA.