The phenomenology of transport barrier formation is reviewed with a focus on physics that may be common to the edge and the core. To this end, the framework of E x B velocity shear reduction of turbulence-induced fluxes, applied to the edge for some time, is studied in the light of measurements of core bifurcation dynamics and recent tests of causality. Also, the possible role of the magnetic shear structure in facilitating core barrier formation is examined. Experimental and theoretical challenges for developing a predictive capability for reactor-relevant conditions are highlighted by recent observations of spontaneous electric field shear generation far removed from edge effects, and efforts to characterize the plasma edge at and across the GH transition. [References: 79]
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机译：审查了运输壁垒形成的现象学，重点是边缘和核心可能共有的物理学。为此，根据核心分叉动力学的测量结果和最近的因果关系测试，研究了施加到边缘的湍流感应通量的E x B速度剪切减小的框架。另外，还研究了磁剪切结构在促进磁芯势垒形成中的可能作用。最近观察到自发电场切变产生没有边缘效应，并努力表征在GH转变处及整个GH转变的等离子体边缘，突显了开发与反应堆相关条件的预测能力的实验和理论挑战。 [参考：79]
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