二次发射微波电子枪的倍增特性
Multiplication effect of the secondary emission microwave electron gun
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摘要: 利用3DRun程序通过数值模拟计算，对二次发射微波电子枪的束流倍增特性作了研究。用1维模型计算了束流倍增与腔两极间距离以及腔中场强的关系，并详细给出了腔两极间距离为10mm,场强为5-4MV/m时出射电子纵向聚束及能量聚焦过程；利用3DRun程序研究了在高频场及粒子束本身空间电荷场的共同作用下，束流在3维运动过程中的倍增特性，计算了出射束流的发射度。通过计算表明：二次发射微波电子枪可以提供低发射度、高流强的电子束。Abstract: Using the primary program 3DRun given by code VC++, multiplication effect of secondary emission microwave electron gun(SEMEG) is investigated. The relation between multiplication effect and length of cavity and electric field in the gun is studied with onedimension simulation. The Longitudinal bunching and energy focusing of out electrons is calculated in detail at 10mm length of cavity and 5.4MV/m electric field in the gun. The beam dynamics with space charge effect is also investigated with 3DRun. The emittance of out beam is calculated. With simulation and analysis, it is proved that SEMEG can provide high-current, low-emittance electron pulse．
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