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(EX6/2) Scaling of H-Mode Pedestal Characteristics in DIII-D and C-Mod

   
R. Granetz ¹, T. H. Osborne ², R. L. Boivin ¹, M. Greenwald ¹, R. J. Groebner ², A. Hubbard ¹, J. Irby ¹, L. L. Lao ², A. W. Leonard ², Y. Lin ¹, R. L. Miller ², T. Sunn Pedersen ¹, G. D. Porter ³, Alcator C-MOD Team  and DIII-D Team 
 
¹ MIT Plasma Science and Fusion Center, Cambridge, MA, USA
² General Atomics, PO Box 85608, San Diego, CA, USA
³ Lawrence Livermore National Laboratory, Livermore, CA, USA

Abstract
Since the H-mode  edge pedestal  effectively sets the boundary conditions for energy transport throughout the core, a better understanding of the pedestal region is necessary in order to fully predict H-mode performance. Pedestal characteristics in the DIII-D  and Alcator C-Mod  tokamaks are described, and scalings of the pedestal width with various plasma parameters are shown. The pedestal width in both tokamaks varies in an inverse sense with plasma current, and is independent of toroidal field. Other similarities, as well as differences, are discussed. It is also found that the pedestal widths of the various physical quantities involved ( $T_e, T_i, n_e, n_i$) may be different.

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