对比结果表明，桥孔比圆孔更有利气流的径向扩散。
The results show that improved hole is more advantageous to the radial mixing of gas stream.
轴对称稳态流，假设轴向扩散相比径向扩散、轴向对流和径向对流是可忽略的。
Axisymmetric steady flow, assume the axial diffusion is negligible compared with the radial diffusion, axial convection and the radial convection.
结果表明，高能电子径向扩散将使驱动电流分布变平和展宽，同时驱动电流减小。
It is shown that the radial diffusion of fast electrons leads both to a broadening of the driven current profile and to a reduction of the total driven current.
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