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Dependence of L-mode confinement on the electron cyclotron power deposition profile in the TCV tokamak

机译:L模式限制对TCV托卡马克中电子回旋加速器功率沉积轮廓的依赖性

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摘要

Scenarios with different electron cyclotron heating power profile distributions and widths were compared for the first time in experiments on the Tokamak à Configuration Variable (TCV). The heating profile was changed from shot to shot over a wide range from localized on-axis, with normalized minor radius half-width at half maximum σ_(1/2) ~ 0.1, up to a widely distributed heating power profile with σ_(1/2) ~ 0.4 and finally to a profile peaked far off-axis. The global confinement, MHD activity, density, temperature and electron pressure profile evolution were compared. In particular, the energy confinement properties of discharges with localized on-axis heating and distributed on-axis heating were very similar, with degradation close to that predicted by the ITER L-mode scaling; in the case of off-axis heating, on the other hand, the confinement degradation was even stronger.
机译:在托卡马克à配置变量(TCV)的实验中,首次比较了具有不同电子回旋加速器功率分布和宽度的方案。在局部轴上,加热分布在一个范围内变化,在较小范围内将归一化的小半径半角标准化为半最大值σ_(1/2)〜0.1,直至分布广泛的加热功率分布为σ_(1) / 2)〜0.4,最后达到离轴峰峰值。比较了整体限制,MHD活性,密度,温度和电子压力分布演变。特别是,在局部轴上加热和分布轴上加热的情况下,放电的能量限制特性非常相似,其退化程度与ITER L模式缩放所预测的接近。另一方面,在离轴加热的情况下,约束劣化甚至更强。

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