Research on control of periodical collapse at edge transport barrier

通过对比实验，研究了边缘传输势垒中边缘局域模式的主动控制和被动控制方法。在小榆树作为被动控制的研究中，比较了获得小榆树的条件。结果表明，根据边缘碰撞程度的不同，可以得到不同类型的小榆树。对于主动控制，证实了在边缘等离子体区域局部注入电子回旋波或低杂波可以提高ELM频率。

Active and passive control methods of Edge Localized Modes (ELMs) at the edge transport barrier have been investigated through comparative experiments using some devices. In the research of small ELMs as a passive control, conditions to obtain small ELMs have been compared. Then, it is revealed that the different type of small ELMs can be obtained depending on the value of the edge collisionality. As for an active control, it is confirmed that the localized injection of the electron cyclotron wave or the lower-hybrid wave to the edge plasma region can increase the ELM frequency.