Electron Cyclotron Current Drive at High Electron Temperature on DIII-D

Petty, C. C.; Austin, M. E.; Harvey, R. W.; Lohr, J.; Luce, T. C.; Makowski, M. A.; Prater, R.
September 2007
AIP Conference Proceedings;9/15/2007, Vol. 933 Issue 1, p397
Academic Journal
Experiments on DIII-D have measured the electron cyclotron current drive (ECCD) efficiency for co- and counter-injection in low density plasmas with radiation temperatures from electron cyclotron emission (ECE) above 20 keV. The radiation temperature is generally higher than the Thomson scattering temperature, indicating that there is a significant population of non-thermal electrons. The experimental ECCD profile measured with motional Stark effect (MSE) polarimetry is found to agree with quasi-linear theory except for the highest power density cases (QEC/ne2>1). Radial transport of the energetic electrons with diffusion coefficients of ∼0.4 m2/s is needed to model the broadened ECCD profile at high power density.


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