| Autor: |
Aigen Xie, Zhenwei Wu, Hengyu Fan, Ningzhuo Cui, Yu Yang, Y.D. Li, P. Fu, Yi Bao, Ning Qiu, Yuanxi Wan, Xiaoning Liu, Liqun Hu, Yanping Zhao, Xingde Tong, Kun Yang, Xiang Gao, Biao Sheng, Mingshen Wei, Huailin Ruan, Yaojiang Shi, Jiarong Luo, Chengyi Xia, Yubao Zhu, Baonian Wan, Xianmei Zhang, Jiangang Li, Junyu Zhao, Yongfei Cheng, Shouyin Zhang, Mei Song, Shengxia Liu, Xiaodong Zhang, Bili Lin, Jiankun Liu, Ling Wang, Weiwei Ye, Min Zeng, Sheng Liu, Xianzhu Gong, Guangli Kuang, Xuemao Gu, Yinxian Jie, Jianshan Mao, Jikang Xie |
| Rok vydání: |
2000 |
| Předmět: |
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| Zdroj: |
Nuclear Fusion. 40:1875-1883 |
| ISSN: |
0029-5515 |
| DOI: |
10.1088/0029-5515/40/11/307 |
| Popis: |
The structure of the operation region has been studied in the HT-7 superconducting tokamak, and progress on the extension of the HT-7 ohmic discharge operation region is reported. A density corresponding to 1.2 times the Greenwald limit was achieved by RF boronization. The density limit appears to be connected to the impurity content and the edge parameters, so the best results are obtained with very clean plasmas and peaked electron density profiles. The peaking factors of electron density profiles for different current and line averaged densities were observed. The density behaviour and the fuelling efficiency for gas puffing (20-30%), pellet injection (70-80%) and molecular beam injection (40-50%) were studied. The core crash sawteeth and MHD behaviour, which were induced by an injected pellet, were observed and the events correlated with the change of current profile and reversed magnetic shear. The MARFE phenomena on HT-7 are summarized. The best correlation has been found between the total input ohmic power and the product of the edge line averaged density and Zeff. HT-7 could be easily operated in the high density region MARFE-free using RF boronization. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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