论文标题
在爆炸模式下发射自我补偿
Emittance self-compensation in blow-out mode
论文作者
论文摘要
我们报告了通过射频光电隔热枪以吹出模式产生的电子束中发射自我补偿的异常状态。模拟清楚地表明，在不同的电子束中，预计发射的最初生长和随后的自我补偿，该束来自以下效果：（i）镜子电荷对阴极上强的空间充电力，（ii）束束中的能量chirp和（iii）对电子束的大量重塑。此外，我们从分析和数字上显示这些效果之间的复杂相互作用如何导致自由空间中的发射自我补偿 - 这种效应通常仅在聚焦磁场中观察到。
We report an unusual regime of emittance self-compensation in an electron bunch generated in blow-out mode by a radio-frequency photocathode gun. Simulations clearly show an initial growth and a subsequent self-compensation of projected emittance in a divergent electron bunch originating from the effects of: (i) strong space-charge forces of mirror charges on the cathode, (ii) an energy chirp in the bunch and (iii) substantial re-shaping of the electron bunch. Furthermore, we show analytically and numerically how a complex interplay between these effects leads to emittance self-compensation in free space -- the effect that is normally observed only in a focusing magnetic field.
