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首页> 外文期刊>Plasma physics and controlled fusion >Characterization of SOL plasma flows and potentials in ICRF-heated plasmas in Alcator C-mod
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Characterization of SOL plasma flows and potentials in ICRF-heated plasmas in Alcator C-mod

机译：Alcator C-Mod中ICRF加热等离子体中溶胶等离子体的表征和潜力

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摘要

Gas-puff imaging techniques are employed to determine the far SOL region radial electric field and the plasma potential in ICRF heated discharges in the Alcator C-Mod tokamak. The two-dimensional velocity fields of the turbulent structures, which are advected by RF-induced E x B flows, are obtained via the time-delay estimation (TDE) techniques. Both the magnitude and radial extension of the radial electric field E-r are observed to increase with the toroidal magnetic field strength B-phi and the ICRF power. In particular, the RF-induced E-r extends from the vicinity of the ICRF antenna to the separatrix when B-phi = 7.9 T and P-ICRF greater than or similar to 1 MW. In addition, low-Z impurity seeding near the antenna is found to substantially reduce the sheath potential associated with ICRF power. The TDE techniques have also been used to revisit and estimate ICRF-induced potentials in different antenna configurations: (1) conventional toroidally aligned (TA) antenna versus field-aligned (FA) antenna; (2) FA monopole versus FA dipole. It shows that FA and TA antennas produce similar magnitude of plasma potentials, and the FA monopole induced greater potential than the FA dipole phasing. The TDE estimations of RF-induced plasma potentials are consistent with previous results based on the poloidal phase velocity.
机译：在Alcator C-Mod托卡马克装置中，采用气体喷射成像技术测定了ICRF加热放电中远溶胶区径向电场和等离子体电位。利用时延估计（TDE）技术获得了射频诱导的E x B流平流下湍流结构的二维速度场。观察到径向电场E-r的大小和径向延伸均随环形磁场强度B-phi和ICRF功率的增加而增加。特别是，当B-phi=7.9 T且P-ICRF大于或类似于1 MW时，射频感应的E-r从ICRF天线附近延伸至分界线。此外，发现天线附近的低Z杂质注入可显著降低与ICRF功率相关的鞘层电位。TDE技术也被用于重新评估和估计不同天线配置下的ICRF感应电位：（1）传统的环形对齐（TA）天线与场对齐（FA）天线；（2） FA单极对FA偶极。结果表明，FA和TA天线产生的等离子体电位大小相似，FA单极子比FA偶极子相移产生的电位更大。射频诱导等离子体电位的TDE估计与以前基于极向相速度的结果一致。

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