Spatiotemporal characterization of zonal flows with multi-channel correlation Doppler reflectometers in the HL-2A Tokamak
Spatiotemporal characterization of zonal flows with multi-channel correlation Doppler reflectometers in the HL-2A Tokamak
复制标题
使用 HL-2A 托卡马克中的多通道相关多普勒反射计对纬向流进行时空表征
DOI：
10.1088/0029-5515/55/11/113005
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发表时间：
2015
期刊：
影响因子：
3.3
通讯作者：
Liu Y
中科院分区：
文献类型：
--
作者：
Zhong W L;Shi Z B;Xu Y;Zou X L;Duan X R;Chen W;Jiang M;Yang Z C;Zhang B Y;Shi P W;Liu Z T;Xu M;Song X M;Cheng J;Ke R;Nie L;Cui Z Y;Fu B Z;Ding X T;Dong J Q;Liu Yi;Yan L W;Yang Q W;Liu Y
利用HL-2A托卡马克上新研制的相关多普勒反射仪研究了径向剪切纬向流引起的极向等离子体流振荡。非干扰诊断允许人们常规测量湍流的旋转速度，从而测量径向电场波动。利用相关多普勒反射仪，研究了测地线声模（GAM）的三维空间结构，包括极向和环向Er波动的对称性特征、GAM频率与径向温度的关系以及GAM的径向传播。提出了低频纬向流与GAM的共存。研究了GAM在等离子体电流和电子密度上升实验中的时间行为，揭示了GAM振荡水平的潜在阻尼机制。
The oscillations of poloidal plasma flows induced by radially sheared zonal flows are investigated by newly developed correlation Doppler reflectometers in the HL-2A tokamak. The non-disturbing diagnostic allows one to routinely measure the rotation velocity of turbulence, and hence the radial electric field fluctuations. With correlation Doppler reflectometers, a three-dimensional spatial structure of geodesic acoustic mode (GAM) is surveyed, including the symmetric feature of poloidal and toroidal Er fluctuations, the dependence of GAM frequency on radial temperature and the radial propagation of GAMs. The co-existence of low-frequency zonal flow and GAM is presented. The temporal behaviors of GAM during ramp-up experiments of plasma current and electron density are studied, which reveal the underlying damping mechanisms for the GAM oscillation level.