This article is the companion of an invited overview talk given at the H-Mode Workshop 2019. Quantitative predictions of the L to H power threshold are needed to prepare the ‘pre-nuclear’ ITER operation in H or He, as well as to design a future fusion reactor where the confinement regime interplay with divertor configuration, radiation level, etc has to be understood. With this urgency in mind, this article aims at sharing references and views on advances on the L to H transition physics understanding. It reviews L mode edge turbulence drive understanding as well as the mechanisms at play behind the ##IMG## [http://ej.iop.org/images/0029-5515/60/10/102002/nfab9e15ieqn1.gif] {$\vec{E}\times\vec{B}$} shear. It shows that our understanding is mature enough to finally model a pedestal formation above a given power threshold using flux driven physics-based models. It shares views on future directions to take, to challenge and hopefully confirm these encouraging ...

中文翻译：

---

基于物理的LH过渡模型的分阶段方法

本文是在2019年H模式研讨会上进行的受邀概述演讲的陪同对象。需要对L到H功率阈值进行定量预测，以准备H或He中的``预核''ITER操作以及进行设计在未来的聚变反应堆中，限制条件必须与偏滤器配置，辐射水平等相互影响。考虑到这一紧迫性，本文旨在分享有关从L到H跃迁物理理解的进展的参考和观点。它回顾了L模式边缘湍流驱动器的理解以及## IMG ##背后的作用机制[http://ej.iop.org/images/0029-5515/60/10/102002/nfab9e15ieqn1.gif] { $ \ vec {E} \ times \ vec {B} $}剪切。它表明我们的理解已经足够成熟，可以使用基于磁通量的基于物理的模型最终对高于给定功率阈值的基座结构进行建模。它就未来的发展方向，挑战并希望确认这些令人鼓舞的观点分享看法。