JETTO simulations of Te/Ti effects on plasma confinement
JETTO simulations of Te/Ti effects on plasma confinement
复制标题
DOI：
10.1088/0741-3335/47/3/007
复制
发表时间：
2005-02
影响因子：
2.2
通讯作者：
E. Asp;J. Weiland;X. Garbet;P. Mantica;V. Parail;W. Suttrop
中科院分区：
文献类型：
--
作者：
E. Asp;J. Weiland;X. Garbet;P. Mantica;V. Parail;W. Suttrop
一系列的热电子等离子体在JET产生的目的是澄清的依赖性的能量约束时间的电子与离子的温度比，Te/Ti。虽然这些等离子体显示出明显的增加，在较高的Te/Ti的离子热扩散率，其能量约束时间保持不变。在本文中，我们提出，这些意见是一致的Weiland模型的能量传输的预测。一个放大离子扩散系数的反馈回路同时也能补偿离子温度分布，并保持离子热通量恒定。电子输运不依赖于Te/Ti，因此没有缩放的约束时间与温度比。为了支持这些说法，我们使用Weiland模型进行了一系列数值模拟。为了标度律的目的，还值得注意的是，能量约束时间也没有显示出对有效输入功率比Pe/Pi的任何依赖性。
A series of hot-electron plasmas were produced at JET with the aim of clarifying the dependence of the energy confinement time on the electron to ion temperature ratio, Te/Ti. Although these plasmas showed a clear increase in the ion heat diffusivity with higher Te/Ti, their energy confinement time remained constant. In this paper we propose that these observations are consistent with the predictions of the Weiland model of energy transport. A feedback loop amplifying the ion diffusivity simultaneously flattens the ion temperature profile, and keeps the ion heat flux constant. The electron transport shows no dependence on Te/Ti, and hence there is no scaling of the confinement time with the temperature ratio. To support these claims we show a series of numerical simulations using the Weiland model. For scaling law purposes it is also interesting to note that the energy confinement time does not show any dependence on the effective input power ratio, Pe/Pi, either.