用束团同步信号触发波形发生器，生成窄脉冲；
Triggered by the in-phase signal, the waveform generator outputs a pulse burst.
为使耦合充分，必须使电子束团与激光脉冲在时间和空间上完全同步。
It is necessary that the electronic bunch and laser pulses are synchronic in both time and space.
提出了在强流直线加速器中，由空间电荷束团的密度分布所引起的非线性效应。
The nonlinear space charge effect due to the nonuniform particle density distribution in bunched beam of a linac is discussed.
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