HL-2A等离子体垂直振荡缓解边缘局域模实验观测

在HL-2A装置实验中,通过对水平场加入方波扰动,实现了等离子体垂直运动。当等离子体向上垂直运动时,观察到了边缘局域模(ELM)缓解现象。研究发现,等离子体向上运动过程中边缘不断形成新的闭合磁面,导致等离子体体积膨胀,进而使台基宽度增加。此外,ELM缓解期间杂质和工作气体再循环有所增加。等离子体向上运动过程中体积膨胀、工作气体再循环及杂质增加可能是导致ELM缓解的主要物理因素。该实验可为未来聚变实验装置ELM的控制提供一些参考。

Observation of edge localized mode mitigation with plasma vertical jogs in HL-2A tokamak

The plasma vertical jogging is performed by adding the square wave perturbation into horizontal field in HL-2A experiments. Edge localized mode (ELM) mitigation is observed when plasma moves upward vertically. The research finds that the plasma column expands due to formation of new edge closed flux surfaces during the upward moving, and then the pedestal widens. In addition, the recycling of working gas and impurity both increase during the ELM mitigation. The expansion of plasma column and the increasing of impurity and recycling of working gas may be the main physical factors of ELM mitigation. This work provides some reference for ELM control in future fusion devices.