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兰州近代物理研究所研制的2×2MV 串列静电加速器在调束时遇到负氢离子源(偏轴引出型双等源)引出电极与单透镜电极频繁的微放电。它导致了离子流和串列加速器端电压的不稳定。微放电比一般的打火轻得多,既听不见打火声又看不清微弱萤光的确切位置。微放电发生时,引出电源与单透镜电源的负载电流均增加不多。放电频率由一分钟一、二次到几分钟一次不等,随离子源工作状态及引出电极和单透镜的电压值而变。发生微放电时,在90°能量分析磁铁后面的法拉第筒上测得的束流从2-3微安瞬时下降到零,然后又立即回升到原来值。从法拉第筒前的石英片看束斑,瞬时散开后,
The 2 × 2MV tandem accelerator developed by Lanzhou Institute of Modern Physics encounters the frequent micro-discharge of the negative electrode and the single lens electrode in the negative ion source (off-axis dual source). It results in instability of ion current and tandem accelerator terminal voltage. Micro-discharge lighter than the average lighter, both can not hear the sound of fire and can not see the exact location of weak fluorescence. When micro-discharge occurs, the load current of the power source and the single-lens power supply increase little. Discharge frequency from one minute, two times to a few minutes ranging, with the ion source working state and leads to the electrode and the single lens voltage value and change. When micro-discharge occurs, the beam current measured on the Faraday cup behind the 90 ° energy analysis magnet drops instantaneously from 2-3 μA to zero and then immediately returns to its original value. From the Faraday tube before the quartz watch beam spot, instantly dispersed,