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在HL-2A装置孔栏位形放电的等离子体实验中，电子回旋辅助加热期间观察到了等离子体约束改善的现象，并对等离子体从低约束模式(L模)向约束改善模式转换时的等离子体线平均电子密度、等离子体储能、分界面内辐射功率、能量约束时间、Hα辐射等进行了研究。同时，分析了电子密度和等离子体辐射功率的空间分布随时间的演化。对改善约束的相关功率(辅助加热、欧姆加热功率和损失功率)进行了分析，并研究了等离子体约束改善转换时的边界净输入功率(阈值)与电子线平均密度和环向磁场的关系。

Improved confinement and analyses of the net power input through the plasma edge on the HL-2A tokamak

The phenomena of improved confinement has been observed with ECRH auxiliary heating under limiter discharge condition on the HL-2A tokamak, and electron line average density, plasma stored energy, radiated power within the separatrix, energy confinement time, H-alpha line emission etc. have been studied for the transition from L-mode to improved mode. At the same time, the time evolution of the profile of electron density and plasma radiation power have also been analyzed. Then several powers(auxiliary heating power, Ohmic heating power and the loss power) of correlating improved confinement are analyzed, and the dependence of the net power that flows through the edge of the plasma for the improved confinement transition on electron line average density and toroidal magnetic field has been carefully studied.