天鹅绒阴极产生的强流双脉冲电子束特性
Characteristics of double-pulsed intense electron beams generated by velvet cathode
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摘要: 通过一台2 MeV直线感应型强流电子注入器建立的双脉冲功率源系统，实验研究了天鹅绒阴极产生的相对论性猝发双脉冲强流电子束基本特性，给出了双脉冲电子束的积分发射度、亮度和双脉冲电子束时间分辨包络变化情况。研究结果表明：天鹅绒阴极产生的双脉冲的亮度达到108 A·(m·rad)-2；实验得到的两个脉冲电子束包络半径不完全一致，这是由于天鹅绒阴极在发射电子束过程中产生的阴极等离子体对真空二极管的影响程度不同所导致的。Abstract: Velvet as a cathode has the ability to emit intense multi-pulsed beams. The characteristics of the double-pulsed relativistic electron beams generated by velvet cathode were studied. The integral emittance and brightness of the double-pulsed beams were presented. The time-resolved envelope radii of the beams were measured. The double-pulsed beams integral brightness reached up to about 108 A·(m·rad)-2 in the experiment. It was the difference of the influence of the cathode plasma generated in the process of emitting beams on the vacuum diode and the recovery velocity of the cathode plasma that resulted in the different envelope radii of the two beams.
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