Poloidally asymmetric response of turbulence to the H mode on the CCT tokamak
Poloidally asymmetric response of turbulence to the H mode on the CCT tokamak
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DOI：
10.1088/0029-5515/33/12/i03
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发表时间：
1993-12
期刊：
影响因子：
3.3
通讯作者：
T. Rhodes;Roger H. Taylor;E. Doyle;Jr. N. C. Luhmann;W. Peebles
中科院分区：
文献类型：
--
作者：
T. Rhodes;Roger H. Taylor;E. Doyle;Jr. N. C. Luhmann;W. Peebles
在CCT托卡马克H模跃迁的密度涨落响应中观察到明显的极向不对称性。这些涨落位于同一密度层上，用反射计在四个极向位置（θ = 0°，90°，180°，270°）上监测。在外侧中平面上，过渡处的波动显著减小，而在内侧中平面上的波动通常很少或没有减小。位于托卡马克顶部和底部的波动表现出中间响应。即使是同一个镜头，所有的极向位置也显示出不同的时间历程。这些观测结果可能表明在H模式转变的波动极向对称化。还观察到E × B速度引起的多普勒频移的极向变化，表明极向不对称的E × B速度轮廓。讨论了这些观测结果的意义，并与大中性束加热的DIII-D托卡马克装置上的跃迁特性进行了比较
A distinct poloidal asymmetry is observed in the response of the density fluctuations at the H mode transition on the CCT tokamak. The fluctuations are located on the same density layer and are monitored by using reflectometers at four poloidal positions (θ = 0°, 90°, 180°, 270°). On the outboard midplane the fluctuations decrease significantly at the transition, while those on the inboard midplane generally show little or no reduction. The fluctuations located at the top and bottom of the tokamak exhibit an intermediate response. All poloidal positions show different time histories even for the same shot. These observations may indicate a poloidal symmetrization of the fluctuations at the H mode transition. A poloidal variation in the E × B velocity induced Doppler shift is also observed, indicating a poloidally asymmetric E × B velocity profile. The significance of these observations is discussed, and comparison is made with the transition properties on the larger neutral beam heated DIII-D tokamak