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Improvement of the Laser Beam Pointing Stability for EAST Thomson Scattering Diagnostic

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Abstract

Thomson scattering diagnostic, measuring the spatial profiles of the electron temperature and density in fusion plasma, is one of the most important diagnostic on tokomaks. The accuracy of its results could be strongly impacted by the stability of the laser beam passing plasma. However, the stability of the laser beam pointing is influenced by many factors. On experimental advanced superconducting tokamak (EAST), the laser beam of Thomson scattering diagnostic (1,064 nm wavelength, 10 ns pulses, 10–50 Hz repetition rate) traverses a network of 7 mirrors approximately 35 m before enters the vacuum chamber. To ensure that the laser beam transports stably and accurately, vibration isolation platforms and a remote supervisory and control system for laser alignment are built. The vibration isolation platforms could mitigate the impact of external vibrations in the beam path. And by using the remote supervisory and control system, misalignments will be found and corrected in time. With these renovations, the beam pointing stability of EAST Thomson scattering diagnostic can be improved from about 120 to 10 μrad successfully.

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Acknowledgments

This work is funded by the National Natural Science Foundation of China with contract Nos. 11275233 and 11075187, and National Magnetic Confinement Fusion Science Program of China under Grant Nos. 2013GB112003 and 2011GB101003.

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Authors and Affiliations

  1. Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Shushanhu road 350, Hefei, 230031, Anhui, China

    Hui Chen, Jun Yu Zhao, Qing Zang, Shu Mei Xiao, Ai Lan Hu, Xiao Feng Han & Teng Fei Wang

Authors
  1. Hui Chen
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  2. Jun Yu Zhao
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  3. Qing Zang
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  4. Shu Mei Xiao
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  5. Ai Lan Hu
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  6. Xiao Feng Han
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  7. Teng Fei Wang
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Corresponding author

Correspondence to Qing Zang.

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Chen, H., Zhao, J.Y., Zang, Q. et al. Improvement of the Laser Beam Pointing Stability for EAST Thomson Scattering Diagnostic. J Fusion Energ 34, 9–15 (2015). https://doi.org/10.1007/s10894-014-9750-1

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  • DOI: https://doi.org/10.1007/s10894-014-9750-1

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