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102. One-dimensional simulation and validation of divertor detachment induced through nitrogen seeding on HL-2A.

Author

Zhou, Yulin, Dudson, Benjamin, Wu, Ting, Wang, Zhanhui, Xia, Tianyang, Zhong, Cailai, Gao, Jinming, Du, Hailong, and Fan, Dongmei

Subjects
TOKAMAKS, CHARGE exchange, GAS mixtures, FUSION reactors, NITROGEN plasmas, ELECTRON temperature
Abstract

Divertor detachment is a promising method to solve the power exhaust problem in tokamak devices or even in future magnetic fusion reactors. In this work, a detachment experiment (HL-2A shot #38008) with mixed gas seeding (60% nitrogen and 40% deuterium) is simulated using the SD1D module in BOUT++. In the process from attachment to detachment, the target electron temperature and the target ion saturation current in simulations are found to be consistent with the experimental results measured by Langmuir probes on the target plate. In order to understand the underlying detachment mechanism on HL-2A, this work analyses the role of different particle species in the cases with different seeding rates. It shows that the plasma density varies little and the density of neutrals ( D and D 2 ) slightly decreases with the increase of nitrogen seeding rate, such that plasma–neutral interactions cannot effectively reduce plasma energy and plasma momentum in the divertor. The case with a high seeding rate predicts that increasing seeding rate cannot reach a target temperature lower than 2.5 eV , which is the required temperature for strong plasma–molecule interactions. Thus, the plasma–molecule interactions may not be important in the divertor during nitrogen seeding. This work also studies the parallel forces including (1) force due to the parallel electric field, (2) friction forces, (3) ion- and electron-thermal forces, and (4) collisional reactions (e.g. charge exchange recombination and ionisation). It is found that the friction force between nitrogen ions and other particle species (primarily D + ) is the dominant force towards the target, while ion- and electron-thermal forces are the dominant force pushing nitrogen ions back to upstream. Parallel forces determine the parallel distribution of nitrogen impurities, and therefore decide the region of nitrogen radiation. [ABSTRACT FROM AUTHOR]

Published
2024
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103. Long radial coherence of electron temperature fluctuations in non-local transport in HL-2A plasmas

Author

Shi, Zhongbing, primary, Fang, Kairui, additional, Li, Jingchun, additional, Zou, Xiaolan, additional, Lu, Zhaoyang, additional, Wen, Jie, additional, Wang, Zhanhui, additional, Ding, Xuantong, additional, Chen, Wei, additional, Yang, Zengchen, additional, Jiang, Min, additional, Ji, Xiaoquan, additional, Tong, Ruihai, additional, Shi, Peiwang, additional, Zhong, Wulyv, additional, and Xu, Min, additional

Published
2023
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119. A facile fluorescence microplate immunoassay based on an in situ fluorogenic reaction for the detection of two highly toxic anticoagulant rodenticides in food and biological matrix

Author

Li, Hongfang, primary, Chen, Jie, additional, Xu, Wenqing, additional, Huang, Baowei, additional, Peng, Chuanyi, additional, Cai, Huimei, additional, Hou, Ruyan, additional, Wen, Kai, additional, Li, Lin, additional, Dong, Baolei, additional, and Wang, Zhanhui, additional

Published
2023
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