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LI Yonggao (李永高), ZHOU Yan (周艳), DENG Zhongchao (邓中朝), LI Yuan (李远), YI Jiang (易江), WANG Haoxi (王浩西). Recent Progress of the HL-2A Multi-Channel HCOOH Laser Interferometer/Polarimeter[J]. Plasma Science and Technology, 2015, 17(5): 430-434. DOI: 10.1088/1009-0630/17/5/11
Citation: LI Yonggao (李永高), ZHOU Yan (周艳), DENG Zhongchao (邓中朝), LI Yuan (李远), YI Jiang (易江), WANG Haoxi (王浩西). Recent Progress of the HL-2A Multi-Channel HCOOH Laser Interferometer/Polarimeter[J]. Plasma Science and Technology, 2015, 17(5): 430-434. DOI: 10.1088/1009-0630/17/5/11

Recent Progress of the HL-2A Multi-Channel HCOOH Laser Interferometer/Polarimeter

Funds: supported by the National Magnetic Confinement Fusion Science Programs of China (Nos. 2010GB101002 and 2014GB109001), and National Natural Science Foundation of China (Nos. 11075048 and 11275059)
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  • A multichannel methanoic acid (HCOOH, λ=432.5 µm) laser interferome- ter/polarimeter is being developed from the previous eight-channel hydrogen cyanide (HCN, λ=337 µm) laser interferometer in the HL-2A tokamak. A conventional Michelson-type interom- eter is used for the electron density measurement, and a Dodel-Kunz-type polarimeter is used for the Faraday rotation effect measurement, respectively. Each HCOOH laser can produce a linearly polarized radiation at a power lever of ∼30 mW, and a power stability <10% in 50 min. A beam waist (diameter d0 ≈12.0 mm, about 200 mm away from the outlet) is finally determined through a chopping modulation technique. The latest optical layout of the interferometer/polarimeter has been finished, and the hardware data processing system based on the fast Fourier transform phase- comparator technique is being explored. In order to demonstrate the feasibility of the diagnostic scheme, two associated bench simulation experiments were carried out in the laboratory, in which the plasma was simulated by a piece of polytetrafluoroethene plate, and the Faraday rotation effect was simulated by a rotating half-wave plate. Simulation results agreed well with the initial ex- perimental conditions. At present, the HCOOH laser interferometer/polarimeter system is being assembled on HL-2A, and is planned to be applied in the 2014–2015 experimental campaign.
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