First results of CO<sub>2</sub> dispersion interferometer on EAST tokamak

Yuyang LIU; Weiming LI; Yuan YAO; Yao ZHANG; Jiamin ZHANG; Hui LIAN; Bo HONG; Shouxin WANG; Yinxian JIE; Haiqing LIU

doi:10.1088/2058-6272/ad0f61

Plasma Science and Technology > 2024 > 26(3): 034011. > DOI: 10.1088/2058-6272/ad0f61

Yuyang LIU, Weiming LI, Yuan YAO, Yao ZHANG, Jiamin ZHANG, Hui LIAN, Bo HONG, Shouxin WANG, Yinxian JIE, Haiqing LIU. First results of CO₂ dispersion interferometer on EAST tokamak[J]. Plasma Science and Technology, 2024, 26(3): 034011. DOI: 10.1088/2058-6272/ad0f61

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First results of CO₂ dispersion interferometer on EAST tokamak

1.
Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
2.
University of Science and Technology of China, Hefei 230026, People’s Republic of China
3.
Institutes of Physical Science and Information Technology, Anhui University, Hefei 230031, People’s Republic of China

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Author Bio:
Weiming LI: weimingli@ipp.ac.cn
Corresponding author:
Weiming LI, weimingli@ipp.ac.cn
Received Date: July 04, 2023
Revised Date: November 21, 2023
Accepted Date: November 22, 2023
Available Online: March 12, 2024
Published Date: March 14, 2024

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Abstract

Abstract

A dispersion interferometer (DI) has been installed and operates on the Experimental Advanced Superconducting Tokamak (EAST). This DI system utilizes a continuous-wave 9.3 μm CO₂ laser source to measure line-averaged electron densities accurately. In contrast to conventional interferometers, the DI does not require substantial vibration isolations or compensating systems to reduce the impact of vibrations in the optical path. It also employs a ratio of modulation amplitudes, ensuring it remains immune to the variations in detected intensities. Without a variation compensation system, the DI system on EAST reaches a density resolution of less than 1.8 × 10⁻²π rad and a temporal resolution of 20 μs. The measurements made by the POlarimeter-INTerferometer (POINT) system and the far-infrared hydrogen cyanide (HCN) interferometer are remarkably consistent with the DI’s results. The possibility of fringe jumps and the impact of refraction in high-density discharge can be significantly decreased using a shorter wavelength laser source. A rapid density change of 3 × 10¹⁹ m⁻³ during 0.15 s has been measured accurately in shot No. 114755 of EAST. Additionally, the DI system demonstrates dependability and stability under 305 s long-pulse discharges in shot No. 122054.

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Acknowledgments

We extend our special thanks to Dr. T Akiyama for his invaluable assistance and guidance. This work was supported by the Comprehensive Research Facility for Fusion Technology Program of China (No. 2018-000052-73-01-001228) and the Major Special Science and Technology Project of Anhui Province (No. 912188707023).

References (21)

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First results of CO₂ dispersion interferometer on EAST tokamak

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