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

Journal Article · Wed Nov 15 04:00:00 EST 2006 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2364133· OSTI ID:20861493

Longwen, Yan; Wenyu, Hong; Kaijun, Zhao; Jiaqi, Dong; Jun, Cheng; Jun, Qian; Deliang, Yu; Cuiwen, Luo; Zhengyu, Xu; Yuan, Huang; Qingwei, Yang; Xuantong, Ding ^[1]

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1. Southwestern Institute of Physics, Chengdu 610041 (China)

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{approx}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{sup -1}, corresponding to radial scale length of 2.4 cm.

• OSTI ID: 20861493
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 77; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BOUNDARY LAYERS
DESIGN
HL-2A TOKAMAK
ION ACOUSTIC WAVES
LANGMUIR PROBE
LENGTH
PLASMA
PLASMA CONFINEMENT
THREE-DIMENSIONAL CALCULATIONS