托卡马克等离子体密度梯度对边缘输运垒形成的作用

Role of Density Gradient in the Formation of Edge Transport Barrier of Tokamak Plasma

从电子、离子的输运方程出发,通过一维输运代码模拟了不同功率下JET装置中的等离子体输运过程。模拟结果表明:当加热功率在一定范围内时,离子的密度梯度趋势变化不大,输运系数增大;当加热功率超过一定阈值,在边缘将产生陡峭的密度梯度,形成边缘输运垒,输运系数显著降低,约束明显改善。

A numerical simulation on the JET tokamak plasma transport is implemented by using One-dimensional transport code based on transport equation of ions and electrons.The calculated results show that the density gradient of ions grows gently as the heating power is increased below the threshold power,while the density gradient is steeply enhanced and the edge transport barrier（ETB） can be formed if the increased heating power is higher than the threshold power.