A comparison of fundamental and second harmonic inside launch ECCD in the presence of a DC electric field
- Lawrence Livermore National Lab., CA (United States)
- General Atomics, San Diego, CA (United States)
Using inside launch, both fundamental and second harmonic Electron Cyclotron Current Drive (ECCD) experiments have been performed in the DIII-D tokamak. Rf currents up to 100 kA have been driven using launched powers up to 1.1 MW. These experiments are characterized by thermal target plasmas with electron temperatures and densities sufficient to result in strong localized deposition of the rf power and good confinement of the rf generated current carriers. A residual dc electric field significantly enhances the current drive efficiency above that predicted by linear theory. The effects of the residual dc electric field are evaluated using a bounce averaged 3D Fokker-Planck code to model the experimental data. For both fundamental and second harmonic ECCD, the measured rf current drive efficiency is found to increase with the residual dc electric field in accordance with theoretical predictions.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48; AC03-89ER51114
- OSTI ID:
- 70703
- Report Number(s):
- UCRL-JC-119283; GA-A21994; CONF-950112-2; ON: DE95009847; TRN: 95:004738
- Resource Relation:
- Conference: 9. joint workshop on electron cyclotron emission and electron cyclotron resonance heating, Borrego Springs, CA (United States), 23-26 Jan 1995; Other Information: PBD: 6 Jan 1995
- Country of Publication:
- United States
- Language:
- English
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