摘要
利用往返式朗缪尔探针组在HL-2A装置等离子体边缘首次同时观测到明显的低频(f=0~5kHz)和测地声模(f=16kHz)带状流的极向和环向对称性(m^0,n^0),径向结构及其传播特征。并同时推算出流的径向波矢(Kr-LF=0.6 cm-1,Kr-GAM=2cm-1)。双谱分析的结果表明低频和测地声模带状流的形成可能都是由于高频湍流和这种流之间的非线性三波耦合引起的。初步研究了电子回旋加热功率和边界安全因子引起带状流幅度的变化。此外,也观测了带状流幅度在径向方向的改变。
The toroidal and poloidal symmetries（m-0, n-0） of the measured low frequency zonal flows （f =0-5kHz） and geodesic acoustic mode zonal flow（f=16kHz） electric potential and radial promulgate features were unambiguously identified with displaced Langmuir probe arrays in the edge plasma of the HL-2A tokamak for the first time. The f＇mite radial wave vector （Kr-LF=0.6cm^-1, Kr-CAM=2cm^-1）of the flows was simultaneously estimated. The formation mechanism of the flows is identified to be nonlinear three wave coupling between high frequency turbulent fluctuations and the flows. Changes of zonal flow amplitude bring by ECRH power and the boundary safety factors were simply studied. Moreover, change of zonal flow amplitude in radial direction was too observed.
出处
《核聚变与等离子体物理》
CAS
CSCD
北大核心
2009年第4期295-300,共6页
Nuclear Fusion and Plasma Physics
基金
国家自然科学基金资助项目(10775044
10675041)
关键词
耙子型探针
梳状型探针
径向传播
三维空间结构
Rake probe array
Pectinate probe array
Radial promulgate
Three dimensional spatial structure
