PPPL-3834 is available in pdf format (932 KB).

Gyrokinetic Calculations of Microturbulence and Transport for NSTX and Alcator-CMOD H-modes

Authors: M.H. Redi, W. Dorland, R. Bell, P. Bonoli, C. Bourdelle, J. Candy, D. Ernst, C. Fiore, D. Gates, G. Hammett, K. Hill, S. Kaye, B. LeBlanc, J. Menard, D. Mikkelsen, G. Rewoldt, J. Rice, R. Waltz, and S. Wukitch

Date of PPPL Report: July 2003

Presented at: the Thirtieth EPS Conference on Controlled Fusion and Plasma Physics, 7-11 July 2003, St. Petersburg, Russian Federation, Russia.

Recent H-mode experiments on NSTX [National Spherical Torus Experiment] and experiments on Alcator-CMOD, which also exhibit internal transport barriers (ITB), have been examined with gyrokinetic simulations with the GS2 and GYRO codes to identify the underlying key plasma parameters for control of plasma performance and, ultimately, the successful operation of future reactors such as ITER [International Thermonuclear Experimental Reactor]. On NSTX the H-mode is characterized by remarkably good ion confinement and electron temperature profiles highly resilient in time. On CMOD, an ITB with a very steep electron density profile develops following off-axis radio-frequency heating and establishment of H-mode. Both experiments exhibit ion thermal confinement at the neoclassical level. Electron confinement is also good in the CMOD core.