Effect of N2, Ne and Ar seeding on Alcator C-Mod H-mode confinement
Effect of N2, Ne and Ar seeding on Alcator C-Mod H-mode confinement
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DOI：
10.1016/j.jnucmat.2010.10.055
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发表时间：
2011-08
影响因子：
3.1
通讯作者：
M. Reinke;J. Hughes;A. Loarte;D. Brunner;I. Hutchinson;B. LaBombard;J. Payne;J. Terry
中科院分区：
文献类型：
--
作者：
M. Reinke;J. Hughes;A. Loarte;D. Brunner;I. Hutchinson;B. LaBombard;J. Payne;J. Terry
偏滤器热流密度的降低是现有托卡马克研究的一个活跃课题。一种方法是使用最后一个封闭通量表面(LCF)内外的辐射，将等离子体热能转化为软X射线和紫外线辐射，这些热能通常指向专门的面向等离子体的组件，分布在更大的表面积上。最近在Alcator C-Mod上进行的增强型D-αH模实验通过杂质种子改变了ICRF的输入功率和辐射功率损失，表明归一化能量限制强烈地依赖于输入功率和激光二极管内辐射功率的差值。这些研究还表明，在保持H98，y2∼1.0时，无论是在Ne还是在N_2中，外偏滤器热通量的减少都是原来的两倍以上。相反，当用Ar播种时，对于类似水平的排气功率，限制限制为H98，y2∼0.8。
The mitigation of divertor heat fluxes is an active topic of investigation on existing tokamaks. One approach uses radiation, both inside and outside the last closed flux surface (LCFS), to convert plasma thermal energy, usually directed towards dedicated plasma facing components, to soft X-ray and ultraviolet radiation, spread over a much larger surface area. Recent enhanced D-α H-mode experiments on Alcator C-Mod varied the ICRF input power and radiative power losses via impurity seeding to demonstrate that normalized energy confinement depends strongly on the difference between input power and the radiated power inside the LCFS. These investigations also show that when seeded with either Ne or N2, a factor of two and higher reduction in outer divertor heat flux is achieved while maintaining H98,y2∼1.0. Conversely, when seeding with Ar, confinement is limited to H98,y2∼0.8 for a similar level of exhaust power.