PHYSICS OF ELCTRON CYCLOTRON CURRENT DRIVE ON DIII-D
OAK A271 PHYSICS OF ELCTRON CYCLOTRON CURRENT DRIVE ON DIII-D. Recent experiments on the DIII-D tokamak have focused on determining the effect of trapped particles on the electron cyclotron current drive (ECCD) efficiency. The measured ECCD efficiency increases as the deposition location is moved towards the inboard midplane or towards smaller minor radius for both co and counter injection. The measured ECCD efficiency also increases with increasing electron density and/or temperature. The experimental ECCD is compared to both the linear theory (Toray-GA) as well as a quasilinear Fokker-Planck model (CQL3D). The experimental ECCD is found to be in better agreement with the more complete Fokker-Planck calculation, especially for cases of high rf power density and/or loop voltage. The narrow width of the measured ECCD profile is consistent with only low levels of radial transport for the current carrying electrons.
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- Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: THIS IS A PREPRINT OF A PAPER TO BE SUBMITTED FOR PUBLICATION IN NUCLEAR FUSION.; PBD: 1 Sep 2002
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- GENERAL ATOMICS (US)
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- United States
- 43 PARTICLE ACCELERATORS; CYCLOTRONS; DEPOSITION; DOUBLET-3 DEVICE; EFFICIENCY; ELECTRON DENSITY; ELECTRONS; PHYSICS; POWER DENSITY; TRANSPORT
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