Recycling behaviour during long pulse discharges after ICRF boronization in the HT-7 tokamak
Recycling behaviour during long pulse discharges after ICRF boronization in the HT-7 tokamak
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DOI：
10.1088/0029-5515/46/2/009
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发表时间：
2006-01
期刊：
影响因子：
3.3
通讯作者：
J. Huang;B. Wan;J.G. Li;X. Gong;X.D. Zhang;Z. Wu;Q. Zhou
中科院分区：
文献类型：
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作者：
J. Huang;B. Wan;J.G. Li;X. Gong;X.D. Zhang;Z. Wu;Q. Zhou
本文用H/（H+D）比和边缘再循环系数R研究了HT-7托卡马克在ICRF硼化（C_2B_（10）H_（12））后长脉冲放电过程中再循环行为的演变。硼化后，观察到杂质减少，归因于新鲜的硼膜，但由于大量的氢吸收在膜中，导致不可控的密度上升和放电终止的再循环系数可以超过1。当H/（H+D）比降低到小于25%时，电子密度容易控制。最长的放电，达到240秒，中心电子温度Te（0）约为1.0 keV，中心电子密度ne（0）为0.8 × 1019 m−3，是在硼化后实现的。多次放电后硼膜的有效性减弱，密度的上升与碳和氧辐射的增加有关，这限制了长脉冲放电的持续时间。
The evolution of recycling behaviour has been investigated during long pulse discharges in the HT-7 tokamak after ICRF boronization (C2B10H12) using the H/(H+D) ratio and the edge recycling coefficient R. After boronization, impurity reduction is observed, attributed to the fresh boron film, but the recycling coefficient can exceed unity due to a large amount of hydrogen absorbed in the film, leading to an uncontrollable density rise and discharge termination. When the H/(H+D) ratio was reduced to less than 25%, the electron density was easily controlled. The longest discharge, up to 240 s with central electron temperature Te(0) of about 1.0 keV and central electron density ne(0) of 0.8 × 1019 m−3, was achieved following boronization. After many discharges the effectiveness of boron film was weakened, and the density rise was correlated with an increase in both carbon and oxygen radiation which limited the duration of long pulse discharges.