1. Density Fluctuation Measurements Using FIR Interferometer on HL-2A Tokamak
- Author
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Duan Xu-Ru, Peng Bei-Bin, Zhao Kaijun, Jiao Yi-Ming, Deng Zhongchao, Li Liancai, Liu Yi, Yang Qingwei, Li Yonggao, Ding Xuan-Tong, Zhou Yan, Yi Jiang, and Ji Xiao-Quan
- Subjects
Physics ,Electron density ,Tokamak ,Condensed matter physics ,Divertor ,General Physics and Astronomy ,Plasma ,law.invention ,Physics::Plasma Physics ,law ,Physics::Space Physics ,Plasma diagnostics ,Atomic physics ,Joule heating ,Fluctuation spectrum ,Power density - 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).
- Published
- 2008