Models for the pedestal temperature at the edge of H-mode tokamak plasmas
Models for the pedestal temperature at the edge of H-mode tokamak plasmas
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DOI：
10.1063/1.1518474
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发表时间：
2002-11
影响因子：
2.2
通讯作者：
T. Onjun;G. Bateman;A. Kritz;G. Hammett
中科院分区：
文献类型：
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作者：
T. Onjun;G. Bateman;A. Kritz;G. Hammett
建立了1型ELMy（边缘局域模）H模（高约束模）等离子体顶部边缘温度的预测模型。基座宽度和压力梯度采用理论模型，而基座密度则由实验数据得到。基座压力梯度被假定为限制的气球模式不稳定性，并表示在磁剪切和几何因素。的自举电流，这减少了在陡峭的压力梯度区域中的H-模式等离子体的边缘的磁剪切的效果，包括在确定的磁剪切。计算磁剪切的方法，结合建议的模型的基座宽度，用于确定基座温度。计算的基座温度进行了比较，超过500个实测基座温度的1型ELMy H模式放电在四个托卡马克。这些结果中的一些不确定性是disc…
Predictive models are developed for the temperature at the top at the edge of type 1 ELMy (edge localized mode) H-mode (high-confinement mode) plasmas. Theory-motivated models are used for the pedestal width and pressure gradient, while the pedestal density is obtained from experimental data in this study. The pedestal pressure gradient is assumed to be limited by the ballooning mode instability and is expressed in terms of the magnetic shear and geometrical factors. The effect of the bootstrap current, which reduces the magnetic shear in the steep pressure gradient region at the edge of the H-mode plasma, is included in the determination of the magnetic shear. Approaches for calculating the magnetic shear, combined with proposed models for the pedestal width, are used to determine the pedestal temperature. The computed pedestal temperatures are compared with more than 500 measured pedestal temperatures for type 1 ELMy H-mode discharges in four tokamaks. Some of the uncertainties in these results are disc...