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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：采用气吹成像技术来确定遥远溶胶区域径向电场和ACCTAT C-MOM Tokamak中的ICRF加热放电中的等离子体电位。通过RF感应的E X B流向的湍流结构的二维速度场通过时滞估计（TDE）技术获得。观察到径向电场E-R的幅度和径向延伸，以随着环形磁场强度B-PHI和ICRF功率的增加而增加。特别地，当B-PHI = 7.9 T和P-ICRF大于或类似于1MW时，RF诱导的E-R从ICRF天线附近到分离器。另外，发现天线附近的低Z杂质播种基本上减小了与ICRF功率相关的鞘电位。 TDE技术还被用来重新检测和估计不同天线配置中的ICRF感应电位：（1）传统的环形对准（TA）天线与场对准（FA）天线相比; （2）FA单极与FA偶极子。它表明，FA和TA天线产生类似的等离子体电位大小，并且FA单极诱导比FA偶极序列更大的潜力。 RF诱导的等离子体电位的TDE估计与基于对子阶段速度的先前结果一致。

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