Turbulent transport is regarded as one of the key issues in magnetic confinement nuclear fusion, both for tokamaks in stellarators. In this work, we show that a significant decrease in a microstability-based proxy, as opposed to a geometric one, for the turbulent heat flux, namely the quasilinear heat flux, can be obtained in an efficient manner by coupling stellarator optimization with linear gyrokinetic simulations. This is accomplished by computing the quasi-linear heat flux at each step of the optimization process, as well as the deviation from quasisymmetry, and minimizing their sum, leading to a balance between neoclassical and turbulent transport proxy.
Designing A Buildable Optimized Stellarator to Confine Electron-Positron Plasmas
Max-Planck-Institut für Plasmaphysik（德国马普等离子体物理研究所）；Plasma Science and Fusion Center, Massachusetts Institute of Technology（麻省理工学院等离子体科学与聚变中心）；Department of Physics, University of Wisconsin-Madison（威斯康星大学麦迪逊分校物理系）；SchulerTEC；Department of Mechanical Engineering, McGill University（麦吉尔大学机械工程系）
Compact quasiaxisymmetric stellarators, a near axisymmetric theory
Princeton University（普林斯顿大学）；University of Wisconsin-Madison（威斯康星大学麦迪逊分校）；Max Plank Institute for Plasma Physics（马克斯·普朗克等离子体物理研究所）；Rudolf Peierls Centre for Theoretical Physics, Parks Road, Oxford, OX1 3PU, UK（牛津大学鲁道夫·皮尔斯理论物理中心）
Efficient Computation of Stellarator Coils with an Augmented Lagrangian Optimization Method
Max-Planck-Institut für Plasmaphysik（马克斯·普朗克等离子体物理研究所）；BASIS Independent Silicon Valley（BASIS独立硅谷）；Courant Institute of Mathematical Sciences, New York University（纽约大学柯朗数学科学研究所）
Optical analogy for stellarators: Ridges as caustics and coils as singularities
Princeton University（普林斯顿大学）；University of Wisconsin-Madison（威斯康星大学麦迪逊分校）；University of Maryland, College Park（马里兰大学帕克分校）；Rudolf Peierls Centre for Theoretical Physics, Parks Road, Oxford, OX1 3PU, UK（鲁道夫·派尔斯理论物理中心）；Max Planck Institute for Plasma Physics（马克斯·普朗克等离子体物理研究所）
A single-field-period quasi-isodynamic stellarator configuration is presented. This configuration, which resembles a twisted strip, is obtained by the method of direct construction, that is, it is found via an expansion in the distance from the magnetic axis. Its discovery, however, relied on an additional step involving numerical optimization, performed within the space of near-axis configurations defined by a set of adjustable magnetic-field parameters. This optimization, completed in 30 seconds on a single cpu core using the SIMSOPT code, yields a solution with excellent confinement, as mea…
Zero-dimensional multi-physics-constrained parameter design and optimization for advanced quasi-isodynamic stellarators
Yan Fusion (Shanghai) Technology Co., Ltd（燕融合（上海）科技有限公司）；PKU Shenzhen Graduate School – Stonehill Technology Joint Laboratory for Fusion and New Energy（北京大学深圳研究生院-石山技术聚变与新能源联合实验室）；College of Physical Science and Technology, Bohai University（渤海大学物理科学与技术学院）；Department of Basic Education and Research, Liaoning Vocational University of Technology（辽宁职业学院基础教研部）
Physics-Informed Neural Networks to Infer the Perpendicular Energy Conductivity in the Scrape-Off Layer of Stellarator Devices
CIEMAT（西班牙能源、环境与技术研究中心）；Harvard John A. Paulson School of Engineering and Applied Sciences（哈佛大学约翰·A·保尔森工程与应用科学学院）；Laboratorio Nacional de Fusión, CIEMAT（CIEMAT国家聚变实验室）
A large diffusive turbulent contribution to the radial impurity transport in Wendelstein 7-X (W7-X) plasmas has been experimentally inferred during the first campaigns and numerically confirmed by means of gyrokinetic simulations with the code stella. In general, the absence of strong impurity accumulation during the initial W7-X campaigns is attributed to this diffusive term. In the present work the diffusive contribution is also calculated in other stellarator plasmas. In particular, the diffusion (D) and convection (V) coefficients of carbon and iron impurities produced by ion-temperature-g…
We present recent highlights from the most recent operation phases of Wendelstein 7-X, the most advanced stellarator in the world. Stable detachment with good particle exhaust, low impurity content, and energy confinement times exceeding 100 ms, have been maintained for tens of seconds. Pellet fueling allows for plasma phases with reduced ITG turbulence, and during such phases, the overall confinement is so good (energy confinement times often exceeding 200 ms) that the attained density and temperature profiles would not have been possible in less optimized devices, since they would have had n…
Asymptotic scaling theory of electrostatic turbulent transport in magnetised fusion plasmas
Princeton Plasma Physics Laboratory（普林斯顿等离子体物理实验室）；University of Maryland（马里兰大学）；University of Oxford（牛津大学）；Princeton University（普林斯顿大学）；Institute for Research in Electronics and Applied Physics（电子与应用物理研究所）；United Kingdom Atomic Energy Authority（英国原子能管理局）；University of New Hampshire（新罕布什尔大学）；University of Otago（奥塔哥大学）
