Calibration of Vacuum Ultraviolet spectroscopy diagnostic on J-TEXT tokamak

Mo, H. J.; Zhang, X.L.; Cheng, Zhifeng; Zhang, Xin Yan; Yang, Zhoujun; Zhou, Yinan; Jiao, Shaodong; Li, Q.; Zhang, Xu; Zhang, H.M.; Lyu, Boyao; He, L.

doi:10.1088/1748-0221/14/10/c10022

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…A space-resolved vacuum ultraviolet (VUV) spectroscopy system based on a 1 m normal incidence spectrometer has been developed on the J-TEXT tokamak [36,37] to observe the highly ionized impurity closer to the plasma center. In this experiment, the VUV diagnostic is set to observe silicon XII (49.9 nm).…”

Section: Methodsmentioning

confidence: 99%

Effect of edge magnetic island on carbon screening in the J-TEXT tokamak

Zhang

Cheng

Zhou

et al. 2021

Plasma Sci. Technol.

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The effect of externally applied resonant magnetic perturbation (RMP) on carbon impurity behavior is investigated in the J-TEXT tokamak. It is found that the m/n=3/1 islands have an impurity screening effect, which becomes obvious while the edge magnetic island is generated via RMP field penetration. The impurity screening effect shows a dependence on the RMP phase with the field penetration, which is strongest if the O point of the magnetic island is near the low-field-side (LFS) limiter plate. By combining a methane injection experimental study and STRAHL impurity transport analysis, we found that the variation of the impurity transport dominates the impurity screening effect. The impurity diffusion at the inner plasma region (r/a<0.8) is enhanced with a significant increase in outward convection velocity at the edge region in the case of the magnetic island's O point near the LFS limiter plate. The impurity transport coefficient varies by a much lower level for the case with the magnetic island's X point near the LFS limiter plate. The interaction of the magnetic island and the LFS limiter plate is thought to contribute to the impurity transport variation with the dependence on the RMP phase. A possible reason is the interaction between the magnetic island and the LFS limiter.

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Section: Methodsmentioning

confidence: 99%

Effect of edge magnetic island on carbon screening in the J-TEXT tokamak

Zhang

Cheng

Zhou

et al. 2021

Plasma Sci. Technol.

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Upgrade of vacuum ultraviolet spectroscopy system on J-TEXT tokamak

Zhang

Qing

Zhang

et al. 2021

Review of Scientific Instruments

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The vacuum ultraviolet (VUV) spectroscopy system on the Joint Texas Experimental Tokamak has been upgraded to achieve fast acquisition for the study of impurity transport in transient modulated experiments. In this upgrade, the previous high-energy charge-coupled device detector was replaced by a microchannel plate with a CsI-coated photocathode and P43 phosphor to transform the VUV light to visible light, which is then acquired by a high-speed electron-multiplying charge-coupled device. Two-stage focusing was achieved using a reference slit plate illuminated successively by a green light source and the Lyman series hydrogen spectral lines from the vacuum-conditioning plasma. The spatial resolution was evaluated as ∼4 mm based on the level of image blurring from the alignment plate. A response time of ∼2 ms was obtained with the ten-vertical-track setup.

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Calibration of Vacuum Ultraviolet spectroscopy diagnostic on J-TEXT tokamak

Cited by 2 publications

References 18 publications

Effect of edge magnetic island on carbon screening in the J-TEXT tokamak

Effect of edge magnetic island on carbon screening in the J-TEXT tokamak

Upgrade of vacuum ultraviolet spectroscopy system on J-TEXT tokamak

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