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首页> 外文期刊>Plasma and Fusion Research >Influence of Safety Factor Profile on Bootstrap Current Fraction in Tokamak Fusion Reactors
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Influence of Safety Factor Profile on Bootstrap Current Fraction in Tokamak Fusion Reactors

机译：安全系数曲线对托卡马克聚变反应堆自举电流分率的影响

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摘要

To achieve a steady-state fusion power plant, non-inductive current-driven plasma operations should be maintained in tokamak fusion reactors. To establish an economical steady-state reactor, the bootstrap current must be enhanced to cover the majority of the plasma current and reduce the amount of externally driven current. The bootstrap current (BS) is affected by the safety factor ( q ) profile through transport; however, it is not known how changes in the safety factor profile affect the bootstrap current fraction. We conducted time-evolution analyses of the current–density profile for burning tokamak plasmas using a two-dimensional equilibrium, one-dimensional transport code (TOTAL code) with the current-diffusive ballooning mode (CDBM) model as the heat transport model. The effect of the safety factor profile on the BS current fraction I BS/ I p was evaluated for ITER-like plasmas. After various analyses for different q profiles, we conclude that the most effective way to increase the BS current fraction is to increase the minimum value for the safety factor. In this ITER simulation based on the CDBM model with 20-MW heating power, a maximum BS fraction of 0.6 was obtained using a central q -value of 10.0, a surface value of 6.0, and a minimum value of 3.0.
机译：为了实现稳态聚变发电厂，托卡马克聚变反应堆应保持非感应电流驱动的等离子体运行。为了建立经济的稳态电抗器，必须提高自举电流以覆盖大部分等离子体电流并减少外部驱动电流。自举电流（BS）受运输过程中安全系数（q）的影响;但是，尚不知道安全系数分布图的变化如何影响自举电流分数。我们使用二维平衡，一维输运代码（TOTAL代码）以及电流扩散气球模型（CDBM）作为热传输模型，对燃烧托卡马克等离子体的电流密度分布进行了时间演化分析。对于类似ITER的血浆，评估了安全系数分布对BS电流分量I BS / I p 的影响。经过对不同q轮廓的各种分析之后，我们得出结论，增加BS电流分数的最有效方法是增加安全系数的最小值。在基于具有20兆瓦加热功率的CDBM模型的ITER模拟中，使用中心q值10.0，表面值6.0和最小值3.0可获得最大BS分数0.6。

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