There exists on optimal value of magnetic focusing field and beam voltage, which can minimize the ion noise amplitude.
束电流与束电压确定,存在最佳的磁场使离子噪声幅度最小。
2
Nodular defects, which are in critical state of damage, are cross-sectioned by focusing on the ionbeam and by imaging using a field emission scanning electron microscope.
采用聚焦离子束和场发射扫描电镜对处于临界破坏状态的节瘤缺陷做剖面分析和观察。
3
Without this supplement, ion beams can 'blow-up' causing loss of intensity and disruption of beamfocusing.