| Autor: |
J. A. Romero, A. C. C. Sips, F. X. Söldner, Annika Ekedahl, P. Schild, F.G. Rimini, B.J.D. Tubbing, B. Fischer, V.V. Parail, M. Lennholm, Yu.F. Baranov, C. Gormezano, T.T.C. Jones, J.A. Dobbing |
| Rok vydání: |
1998 |
| Předmět: |
|
| Zdroj: |
Nuclear Fusion. 38:1397-1407 |
| ISSN: |
0029-5515 |
| Popis: |
In lower hybrid current drive (LHCD) experiments in JET, up to 7.3 MW of lower hybrid (LH) power has been coupled to X point plasmas, resulting in sawtooth suppression and full current drive up to 3 MA. The current drive efficiency reached ηCD = 0.26 × 1020 m-2A/W in these experiments. The LH power deposition and driven current profiles can be quite well reproduced with the ray tracing and Fokker-Planck code in JET, even when multipass absorption of the LH wave is dominant. Profile control with off-axis LHCD has been used for increasing q above 1, thereby suppressing sawteeth before the edge localized mode (ELM)-free hot ion H mode. In optimized shear plasmas, a broad q profile with central negative shear was formed with moderate LH power (~2 MW), applied in the low density phase during the current rampup. An internal transport barrier with improved electron confinement was produced, which resulted in a peaking of the electron temperature profile and Te0 up to 10 keV at ne0 ≤ 1.5 × 1019 m-3. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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