PPPL-4088 is available in pdf format (324 KB).

GYRO Simulations of Core Momentum Transport in DIII-D and JET Plasmas

Authors: R.V. Budny, J. Candy, R.E. Waltz, and contributors to the DIII-D and JET-EFDA work programs

Date of PPPL Report: June 2005

Presented at: the International Tokamak Physics Activity (ITPA) MHD, SOL and Divertor Working Groups Meeting, 4-6 July 2005, Tarragona, Spain.

Momentum, energy, and particle transport in DIII-D and JET ELMy H-mode plasmas is simulated with GYRO and compared with measurements analyzed using TRANSP. The simulated transport depends sensitively on the ∇(Ti) turbulence drive and the ∇(Er) turbulence suppression inputs. With their nominal values indicated by measurements, the simulations over-predict the momentum and energy transport in the DIII-D plasmas, and under-predict in the JET plasmas. Reducing |∇(Ti)| and increasing |∇(Er)| by up to 15% leads to approximate agreement (within a factor of two) for the DIII-D cases. For the JET cases, increasing |∇(Ti)| or reducing |∇(Er)| results in approximate agreement for the energy flow, but the ratio of the simulated energy and momentum flows remains higher than measurements by a factor of 2–4.