JET carbon screening experiments using methane gas puffing and its relation to intrinsic carbon impurities
JET carbon screening experiments using methane gas puffing and its relation to intrinsic carbon impurities
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DOI：
10.1088/0029-5515/43/9/317
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发表时间：
2002-11
期刊：
影响因子：
3.3
通讯作者：
J. Strachan;W. Fundamenski;M. Charlet;G. Corrigan;K. Erents;J. Gafert;C. Giroud;C. Gowers;M. Hellermann;L. Horton;G. Matthews;G. Mccracken;V. Philipps;J. Spence;M. Stamp;K. Zastrow
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文献类型：
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作者：
J. Strachan;W. Fundamenski;M. Charlet;G. Corrigan;K. Erents;J. Gafert;C. Giroud;C. Gowers;M. Hellermann;L. Horton;G. Matthews;G. Mccracken;V. Philipps;J. Spence;M. Stamp;K. Zastrow
使用甲烷气体注入进行JET碳筛选实验。L模式实验扫描影响JET刮除层（SOL）和/或本征杂质水平的参数。导出了描述甲烷从JET水平中平面注入L模等离子体的标度关系。L-模式筛选是3-20倍连接到偏滤器的等离子体比类似的有限的等离子体。从中平面注入甲烷的屏蔽效果较差，而从偏滤器注入甲烷的屏蔽效果最好。H模式的筛选比L模式差1.5-2倍。记录ELM平均和ELM间H模式筛选。筛选结果用于了解本征杂质水平。Zeff在较高密度下降低，部分是由于在较高密度下更好的碳屏蔽，部分是由于减少的碳流入。转向的L模式固有碳水平来自主室和偏滤器源，而H模式碳主要来自偏滤器。使用DIVIMP和EDGE 2D对观察到的筛选进行建模。模拟表明，碳去除偏滤器需要较低的温度库仑碰撞耦合的杂质离子的SOL氘流。碳的去除主要发生在外SOL区域。
JET carbon screening experiments were performed using methane gas injection. L-Mode experiments scanned parameters influencing the JET scrape-off-layer (SOL) and/or intrinsic impurity level. Scaling relations are derived to describe methane injected into L-Mode plasmas from the JET horizontal mid-plane. L-Mode screening was 3–20 times better for plasmas connected to the divertor than for similar limited plasmas. The screening was worse for methane injection from the mid-plane and best for injection from the divertor. The screening was 1.5–2 times worse for H-Mode than L-Mode. Both ELM-averaged and inter-ELM H-Mode screening was documented. The screening results were used to understand the intrinsic impurity levels. Zeff reduced at higher densities partly due to better carbon screening at the higher density, and partly due to decreased carbon influxes. Diverted L-Mode intrinsic carbon levels arose from both main chamber and divertor sources, while H-mode carbon primarily originated from the divertor. DIVIMP and EDGE2D were used to model the observed screening. The modelling indicated that carbon removal to the divertor required lower temperatures for Coulomb collisions to couple the impurity ions to the SOL deuterium flows. The carbon removal occurred primarily in the outer SOL regions.