Divertor Experiments with MBI and Strong Gas Puffing on HL-2A
Divertor Experiments with MBI and Strong Gas Puffing on HL-2A
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DOI：
10.1088/1009-0630/8/1/5
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发表时间：
2006
影响因子：
1.7
通讯作者：
Duan Xu-ru;Ding Xuan-tong;Yang Qingwei;Yan Long-wen;Yao Lianghua;Hong Wen-yu;Xu Weimin;L. Dequan;Chen Liao-yuan;S. Xianming;Z. Jinhua;Cao Zeng;Cui Zhengying;Li Wei;L. Yi;Pan Yudong;Pan Li;Zheng Yin-jia;Zhou Yan;Mao Wei-cheng;Liu Yong
中科院分区：
文献类型：
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作者：
Duan Xu-ru;Ding Xuan-tong;Yang Qingwei;Yan Long-wen;Yao Lianghua;Hong Wen-yu;Xu Weimin;L. Dequan;Chen Liao-yuan;S. Xianming;Z. Jinhua;Cao Zeng;Cui Zhengying;Li Wei;L. Yi;Pan Yudong;Pan Li;Zheng Yin-jia;Zhou Yan;Mao Wei-cheng;Liu Yong
在HL-2A 2004实验活动中，采用了偏滤器位形下的脉冲分子束注入和强氢气喷注的方法进行气体燃料加注。实验结果表明，氢的MBI可以降低偏滤器靶板的热流密度。由朗缪尔探针阵列测量的电子温度显着下降，而电子密度增加的分子束注入过程中。这表明靶板附近的等离子体压力趋于恒定在一个新的平衡水平。在偏滤器等离子体中，强氢气的喷流使等离子体密度达到4.4 × 1019 m−3。此外，还观察到一种类似于偏滤器部分脱离状态的现象，目前正在DIII-D等开放式偏滤器托卡马克中研究这种现象，以减少分界线附近靶板上的峰值热通量。在强吹气后，偏滤器靶板上分界线附近的电子温度下降到5 eV以下，而较远的偏滤器靶板的电子温度变化不明显;等离子体边缘的CIII和Hα发射降低，而X点附近的Hα发射增加。这些结果反映了一些有趣的特性，需要进一步的建模和实验研究。
In the HL-2A 2004 experiment campaign, pulsed molecular beam injection (MBI) and strong hydrogen gas puffing under the divertor configuration were used for gas fueling. The experimental results show that the MBI of hydrogen can reduce the heat flux to the divertor target plate. The electron temperature measured by the Langmuir probe array decreases significantly during the injection of the molecular beam whereas the electron density increases. This indicates that the plasma pressure near the target plates tends to be constant at a new equilibrium level. In the divertor plasmas with strong hydrogen gas puffing a high plasma density up to 4.4 × 1019 m−3 was achieved. In addition, a phenomenon similar to the partially detached divertor regime was observed, which is being studied in open divertor tokamaks such as DIII-D to reduce the peak heat flux on the target plates near the separatrix. After a strong gas puffing the electron temperature measured on the outer divertor target plate near the separatrix decreases till below 5 eV or even lower, but that of the farther outer divertor target plate does not change obviously; and the CIII and the Hα emissions at the plasma edge decrease as expected, but the Hα emission near the X-point increases. These results reflects some interesting characteristics, which needs to be studied by further modeling and experiments.