| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Observation of E×B Flow Velocity Profile Change Using Doppler Reflectometry in HL-2A |
XIAO Wei-Wen1, ZOU Xiao-Lan2, DING Xuan-Tong1, DONG Jia-Qi1, LIU Ze-Tian1, SONG Shao-Dong2, GAO Ya-Dong1, YAO Liang-Hua1, FENG Bei-Bin1, SONG Xian-Ming1, CHEN Cheng-Yuan1, SUN Hong-Juan1, LI Yong-Gao1, YANG
Qing-Wei1, YAN Long-Wen1, LIU Yi1, DUAN Xu-Ru1, PAN Chuan-Hong1, LIU Yong1 |
| 1Southwestern Institute of Physics, PO Box 432, Chengdu 6100412Association Euratom-CEA, CEA/DSM/IRFM,CEA/Cadarache, 13018 St Paul-les-Durance, France |
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| Cite this article: |
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XIAO Wei-Wen, ZOU Xiao-Lan, DING Xuan-Tong et al 2009 Chin. Phys. Lett. 26 035201 |
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Abstract A broadband, O-mode sweeping Doppler reflectometry designed for measuring plasma E×B flow velocity profiles is operated in HL-2A. The main feature of the Doppler reflectometry is its capability to be tuned to any selected frequency in total waveband from 26-40GHz. This property enables us to probe several plasma layers within a short time interval during a discharge, permitting the characterization of the radial distribution of plasma fluctuations. The system allows us to extract important information about the velocity change layer, namely its spatial localization. In purely Ohmic discharge a change of the E×B flow velocity profiles has been observed in the region for 28<r<30cm if only the line average density exceeds 2.2×1019m-3. The density gradient change is measured in the same region, too.
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52.25.Fi
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Received: 18 November 2008
Published: 19 February 2009
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