Determination of the Electron Cyclotron Current Drive Profile

Conference · Mon Nov 01 04:00:00 EST 1999

OSTI ID:766680

Luce, T C ^[1]; Petty, C C; Schuster, D I; Makowski, M A

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1. General Atomics

Evaluation of the profile of non-inductive current density driven by absorption of electron cyclotron waves (ECCD) using time evolution of the poloidal flux indicated a broader profile than predicted by theory. To determine the nature of this broadening, a 1-1/2 D transport calculation of current density evolution was used to generate the signals which the DIII-D motional Stark effect (MSE) diagnostic would measure in the event that the current density evolution followed the neoclassical Ohm's law with the theoretical ECCD profile. Comparison with the measured MSE data indicates the experimental data is consistent with the ECCD profile predicted by theory. The simulations yield a lower limit on the magnitude of the ECCD which is at or above the value found in Fokker-Planck calculations of the ECCD including quasilinear and parallel electric field effects.

• Research Organization: General Atomics, San Diego, CA (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC03-99ER54463; W-7405-ENG-48
• OSTI ID: 766680
• Report Number(s): GA-A23259
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABSORPTION
CURRENT DENSITY
DOUBLET-3 DEVICE
ECR HEATING
FOKKER-PLANCK EQUATION
STARK EFFECT