The effect of electron interaction on gain of a free-electron laser pumped with a helical magnetic field is formulated.
求出了螺旋磁场泵自由电子激光器中含电子相互作用的增益表达式，并进行了讨论。
The helical instability problem of an arc plasma column with a parabolic current profile in a magnetic field is discussed.
讨论了具有抛物线形电流分布的电弧等离子体柱在磁场中的不稳定性问题。
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