Experimental and numerical modeling of plasma start-up assisted by electron drift injection on J-TEXT Article Swipe

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Junli Zhang , Zhifeng Cheng , Yanli Peng , Zhoujun Yang , K. Nagasaki , Nengchao Wang , Hao Cai , Yonghua Ding , Zhipeng Chen , Zhongyong Chen , Wei Jiang , Donghui Xia , Zhijiang Wang , Yuan Pan ·

YOU? · · 2023 · Open Access · · DOI: https://doi.org/10.1088/1741-4326/acc345

Start-up is one of the critical phases for tokamak discharge. The electron drift injection (EDI) system has been developed on J-TEXT for start-up studies. A breakdown experiment with EDI-assisted start-up has been conducted, which verified the effect of pre-ionization by EDI to achieve start-up at a lower ohmic field voltage. A zero-dimensional (0D) model has been developed to explain the effect of EDI quantitatively. The comparison between the experiment and simulation verified the credibility of this model. Based on this model, a comparison between pure ohmic heating start-up and EDI-assisted start-up was presented, showing that EDI improved ionization, causing a lower delay to the peak of hydrogen ionization and radiation losses and a smoother rise in the electron and ion energy. This result quantitatively verified the pre-ionization effect of EDI on start-up . The effects of injecting different currents and electron energy were investigated. A better pre-ionization effect was realized by increasing the injected current, which can be a reference for the upgrading of the EDI system.

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Ionization Plasma Atomic physics Electron Tokamak Impact ionization Ohmic contact Joule heating Materials science Ion Physics Nuclear physics Nanotechnology Layer (electronics) Quantum mechanics Composite material

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Type: article
Language: en
Landing Page: https://doi.org/10.1088/1741-4326/acc345
PDF: https://iopscience.iop.org/article/10.1088/1741-4326/acc345/pdf
OA Status: diamond
Cited By: 2
References: 57
Related Works: 10
OpenAlex ID: https://openalex.org/W4323827183

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DOI: https://doi.org/10.1088/1741-4326/acc345

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Title: Experimental and numerical modeling of plasma start-up assisted by electron drift injection on J-TEXT

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Type: article

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Language: en

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Publication year: 2023

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Publication date: 2023-03-10

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Authors: Junli Zhang, Zhifeng Cheng, Yanli Peng, Zhoujun Yang, K. Nagasaki, Nengchao Wang, Hao Cai, Yonghua Ding, Zhipeng Chen, Zhongyong Chen, Wei Jiang, Donghui Xia, Zhijiang Wang, Yuan Pan

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Landing page: https://doi.org/10.1088/1741-4326/acc345

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PDF URL: https://iopscience.iop.org/article/10.1088/1741-4326/acc345/pdf

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Concepts: Ionization, Plasma, Atomic physics, Electron, Tokamak, Impact ionization, Ohmic contact, Joule heating, Materials science, Ion, Physics, Nuclear physics, Nanotechnology, Layer (electronics), Quantum mechanics, Composite material

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Cited by: 2

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