Turbulent optimization of toroidal configurations

Turbulent optimization of toroidal configurations
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环形结构的湍流优化

DOI:
10.1088/0741-3335/56/9/094001
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发表时间:
2014
影响因子:
2.2
通讯作者:
J. Talmadge
J. Talmadge
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
H. Mynick;P. Xanthopoulos;B. Faber;M. Lucia;M. Rorvig;J. Talmadge

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本文介绍了在环形布局的“湍流优化”方面的最新进展,采用了一种最近发展起来的方法,将这种布局发展成具有减少湍流输运的布局。该方法使用GENE gyrokinetic代码来计算径向热通量Qgk,并使用STELLOPT优化代码与基于理论的“代理”品质因数Qpr来代替Qgk以提高计算速度。已经开发了用于Qpr的改进的表达式,涉及超出原始代理中的几何量的进一步几何量,其也可以用作“控制旋钮”以减少Qgk。全局搜索算法的使用导致发现了标准的、通常采用的局部算法所找不到的最优配置,因为使用了STELLOPT已经扩展以提供的在搜索空间上的品质因数的映射能力。
Recent progress in ‘turbulent optimization’ of toroidal configurations is described, using a method recently developed for evolving such configurations to ones having reduced turbulent transport. The method uses the GENE gyrokinetic code to compute the radial heat flux Qgk, and the STELLOPT optimization code with a theory-based ‘proxy’ figure of merit Qpr to stand in for Qgk for computational speed. Improved expressions for Qpr have been developed, involving further geometric quantities beyond those in the original proxy, which can also be used as ‘control knobs’ to reduce Qgk. Use of a global search algorithm has led to the discovery of turbulent-optimized configurations not found by the standard, local algorithm usually employed, as has use of a mapping capability which STELLOPT has been extended to provide, of figures of merit over the search space.
伊藤公隆:等离子体物理学和受控聚变。31。(1989)
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