首页|First results of CO2 dispersion interferometer on EAST tokamak

First results of CO2 dispersion interferometer on EAST tokamak

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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.

dispersion interferometer(DI)electron densityplasma diagnosticsExperimental Advanced Superconducting Tokamak(EAST)

刘郁阳、李维明、姚远、张耀、张家敏、连辉、洪博、王守信、揭银先、刘海庆

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Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,People's Republic of China

University of Science and Technology of China,Hefei 230026,People's Republic of China

Institutes of Physical Science and Information Technology,Anhui University,Hefei 230031,People's Republic of China

Comprehensive Research Facility for Fusion Technology Program of ChinaMajor Special Science and Technology Project of Anhui Province

2018-000052-73-01-001228912188707023

2024

10.1088/2058-6272/ad0f61

等离子体科学和技术(英文版)
中国科学院合肥物质科学研究所 中国力学学会

等离子体科学和技术(英文版)

EI
影响因子：0.297
ISSN：1009-0630
年,卷(期)：2024.26(3)
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