| Original Articles |
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Density Fluctuation Measurements Using FIR Interferometer on HL-2A Tokamak |
ZHOU Yan, LI Lian-Cai, LI Yong-Gao, JIAO Yi-Ming, DENG Zhong-Chao,
YI Jiang, LIU Yi, ZHAO Kai-Jun, JI Xiao-Quan, PENG Bei-Bin, YANG Qing-wei,
DUAN Xu-Ru, DING Xuan-Tong |
| Southwestern Institute of Physics, PO Box 432, Chengdu 610041 |
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| Cite this article: |
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ZHOU Yan, LI Lian-Cai, LI Yong-Gao et al 2008 Chin. Phys. Lett. 25 2558-2561 |
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Abstract Density fluctuations were first measured in the core region of HL-2A tokamak plasma using a newly developed multi-channel FIR interferometer system. In divertor ohmic discharges, we measured the radial density fluctuation levels of 5%, which increase to 10--20% during the appearance of MHD activity. Most of the power density in the density fluctuation spectrum is directly associated with m=2 tearing modes. The fluctuation levels reduce to 1/3 and plasma confinement is improved during off-axis electron-cyclotron-resonance heating (ECRH).
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| Keywords:
52.35.-g
52.55.Fa
52.55.Dy
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Received: 26 March 2008
Published: 26 June 2008
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| PACS: |
52.35.-g
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(Waves, oscillations, and instabilities in plasmas and intense beams)
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52.55.Fa
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(Tokamaks, spherical tokamaks)
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52.55.Dy
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(General theory and basic studies of plasma lifetime, particle and heat loss, energy balance, field structure, etc.)
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