Profile control experiments in JET using off-axis lower hybrid current drive

被引：49

作者：

Ekedahl, A ^{[1
]}

Baranov, YF ^{[1
]}

Dobbing, JA ^{[1
]}

Fischer, B ^{[1
]}

Gormezano, C ^{[1
]}

Jones, TTC ^{[1
]}

Lennholm, M ^{[1
]}

Parail, VV ^{[1
]}

Rimini, FG ^{[1
]}

Romero, JA ^{[1
]}

Schild, P ^{[1
]}

Sips, ACC ^{[1
]}

Soldner, FX ^{[1
]}

Tubbing, BJD ^{[1
]}

机构：

[1] Jet Joint Undertaking, Abingdon OX14 3EA, Oxon, England

来源：

NUCLEAR FUSION | 1998年 / 38卷 / 09期

关键词：

D O I：

10.1088/0029-5515/38/9/314

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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 eta(CD) = 0.26 x 10(20) m(-2) A/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 (similar to 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 T-e0 up to 10 keV at eta(e0) less than or equal to 1.5 x 10(19) m(-3).

引用

页码：1397 / 1407

页数：11

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