控制当前及未来仿星器中的湍流。

Controlling turbulence in present and future stellarators.

作者信息

Xanthopoulos P, Mynick H E, Helander P, Turkin Y, Plunk G G, Jenko F, Görler T, Told D, Bird T, Proll J H E

机构信息

Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald, Germany.

Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA.

出版信息

Phys Rev Lett. 2014 Oct 10;113(15):155001. doi: 10.1103/PhysRevLett.113.155001. Epub 2014 Oct 7.

DOI:10.1103/PhysRevLett.113.155001

PMID:25375712

Abstract

Turbulence is widely expected to limit the confinement and, thus, the overall performance of modern neoclassically optimized stellarators. We employ novel petaflop-scale gyrokinetic simulations to predict the distribution of turbulence fluctuations and the related transport scaling on entire stellarator magnetic surfaces and reveal striking differences to tokamaks. Using a stochastic global-search optimization method, we derive the first turbulence-optimized stellarator configuration stemming from an existing quasiomnigenous design.

摘要

人们普遍认为，湍流会限制约束，进而限制现代新经典优化仿星器的整体性能。我们采用了新型的千万亿次浮点运算规模的回旋动理学模拟，来预测湍流涨落的分布以及整个仿星器磁面上相关的输运标度，并揭示与托卡马克的显著差异。我们使用一种随机全局搜索优化方法，从现有的准全向设计中推导出首个经湍流优化的仿星器构型。