Download or read book Edge Dimensionless Identity Experiment on DIII-D and Alcator C-Mod written by Dmitri A. Mossessian and published by . This book was released on 2002 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments were carried out to study the similarity of H-mode (High confinement mode) physics on the Alcator C-Mod and DIII-D tokamaks comparing plasmas with matched local edge dimensionless parameters ... and shape ... It was observed that matching local values of the dimensionless parameters on top of the H-mode pedestals produces similar Te and ne profiles across the entire pedestal region, with pedestal width scaling linearly with the machine size. Furthermore, in H-modes with matched pedestals, similar edge fluctuations were observed. Discharges in DIII-D with scaled pedestal parameters similar to those of C-Mod EDA (Enhanced D-alpha) H-mode showed a quasicoherent mode localized to the outer half of the pedestal, similar to the C-Mod quasicoherent mode (QC mode). The wavenumber of the mode observed on DIII-D matches the wavenumber of the C-Mod QC mode if scaled with the machine size. For higher pedestal temperatures and pressures, small high frequency ELMs (Edge Localized Modes) appear in both machines. Keywords: edge plasmas; H-mode; tokamaks; fluctuations; transport phenonmena.