Novel design for zonal flow probe arrays in the HL-2A tokamak

Longwen Yan; Wenyu Hong; Kaijun Zhao; Jiaqi Dong; Jun Cheng; Jun Qian; Deliang Yu; Cuiwen Luo; Zhengyu Xu; Yuan Huang; Qingwei Yang; Xuantong Ding
November 2006
Review of Scientific Instruments;Nov2006, Vol. 77 Issue 11, p113501
Academic Journal
A novel design of three-step Langmuir probe (TSLP) array has been developed for zonal flow (ZF) studies in the HL-2A tokamak. Three TSLP arrays are used to determine three-dimensional (3D) features of the ZFs. Two TSLP arrays are located in the same poloidal plane at a 6.5 cm separation, while the third TSLP array is separated toroidally by 80 cm. A fourth TSLP array driven by pneumatically reciprocating system is applied for boundary parameter profile measurements within 8 cm. The TSLP structure is described in detail. The measured 3D properties of the geodesic acoustic mode (GAM) ZFs are described and the poloidal and toroidal mode numbers (m<2,n∼0) are simultaneously determined in the HL-2A tokamak for the first time. The radial wave vector at the GAM frequency is estimated as 2.6±0.2 cm-1, corresponding to radial scale length of 2.4 cm.


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