Size Scaling of Turbulent Transport in Magnetically Confined Plasmas
Authors: Z. Lin, S. Ethier, T.S. Hahm, and W.M. Tang
Date of PPPL Report: April 2002
Published in: Physical Review Letters 88 (13 May 2002) 195004
Transport scaling with respect to device size in magnetically confined plasmas is critically examined for electrostatic ion temperature gradient turbulence using global gyrokinetic particle simulations. It is found, by varying device size normalized by ion gyroradius while keeping other dimensionless plasma parameters fixed, that fluctuation scale length is microscopic in the presence of zonal flows. The local transport coefficient exhibits a gradual transition from a Bohm-like scaling for device sizes corresponding to present-day experiments to a gyro-Bohm scaling for future larger devices.