期刊
NUCLEAR FUSION
卷 63, 期 6, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1741-4326/acc345
关键词
start-up; electron drift injection; J-TEXT; 0D model
The EDI system has been developed and utilized for start-up studies on J-TEXT tokamak. The pre-ionization effect of EDI on start-up was verified through a breakdown experiment, and a 0D model was developed to quantitatively explain this effect. The comparison between experiment and simulation showed that EDI-assisted start-up resulted in improved ionization and smoother rise in energy.
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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