不稳定性产生的可能机制是由于电子束穿过低密度本底等离子体的漂移速度超过离子声速而激发起来的。
It is suggested that the instability is excited in the low density plasma when the electron beam drift velocities exceed the ion acoustic speed.
该电路用在北京谱仪触发判选系统中，作为排除由于干扰信号造成主漂移室成片着火的本底事例。
This circuit is used in BES Trigger System to reject the background caused by interference in MDC.
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