Optimization of the optical system for electron cyclotron emission imaging diagnostics on the HL-2A tokamak

Min JIANG (蒋敏); Zhongbing SHI (石中兵); Yilun ZHU (朱逸伦)

doi:10.1088/2058-6272/aa62f7

Plasma Science and Technology > 2017 > 19(8): 84001-084001. > DOI: 10.1088/2058-6272/aa62f7

Min JIANG (蒋敏), Zhongbing SHI (石中兵), Yilun ZHU (朱逸伦). Optimization of the optical system for electron cyclotron emission imaging diagnostics on the HL-2A tokamak[J]. Plasma Science and Technology, 2017, 19(8): 84001-084001. DOI: 10.1088/2058-6272/aa62f7

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Optimization of the optical system for electron cyclotron emission imaging diagnostics on the HL-2A tokamak

1 Southwestern Institute of Physics, Chengdu 610041, People’s Republic of China
2 University of Science and Technology of China, Hefei 230022, People’s Republic of China

Funds: This work is supported by the National Magnetic Confinement Fusion Science Program of China (No. 2013GB104000).

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Abstract

Abstract

The optical system of the electron cyclotron emission imaging diagnostics on the HL-2A tokamak has been optimized in both the narrow zoom pattern and the wide zoom pattern. The two main features of the improved optical system are (1) larger coverage of the measurement region in the plasma and (2) a flatter imaging surface. The new optics has good focal characteristics over the whole plasma cross section. The curvature of the field of the image surface (ΔR between the core channel and the edge channel) is within 5.3 cm in the narrow zoom pattern and 6.7 cm in the wide zoom pattern after optimization, whereas the values with the present optics were 23 cm in the narrow zoom pattern and 15 cm in the wide zoom pattern. The optics will be fabricated, tested and
installed on the HL-2A tokamak before the next experimental campaign.
- optical system,
- image surface,
- ECEI diagnostics,
- curvature of the field

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