SCALING OF THE H-MODE POWER THRESHOLD FOR ITER

Analysis of the latest ITER H-mode threshold database is presented. Th e power necessary for the transition to H-mode is estimated for ITER, with or without the inclusion of radiation losses from the bulk plasma , in terms of the main engineering variables. The main geometrical var iables (aspect ratio epsilon, elongation kappa and average triangulari ty delta) are also included in the analysis. The H-mode transition is also considered from the point of view of the local edge variables, an d the electron temperature at 90% of the poloidal flux is expressed in terms of both local and global variables.