【摘要】 为了改善电子注与聚焦磁场的匹配状态以实现带状电子注的长距离稳定传输,提出了一种优化的周期凸起磁场(PCM)聚焦结构。与传统的PCM聚焦结构相比,优化的PCM结构改善了电子注的成形和传输状态,能够约束带状注长距离稳定传输。电子枪设计电压75 kV,电流3.8 A,10 mm×0.5 mm的带状电子注由10 mm×4 mm的椭圆阴极面发射并在单一方向压缩形成。漂移通道长89 mm,横向截面尺寸为12 mm×0.8 mm。结果显示,磁场周期为12 mm,峰值为0.24 T;电子注传输时在高度方向的最大波动尺寸为0.6 mm。该聚焦结构同时还能兼容线包聚焦方式,磁场强度和电子注输时在高度方向的波动尺寸分别为0.31 T和0.5 mm,束流通过率为100%。更多还原

【Abstract】 A novel type of the periodic cusped magnetic(PCM)focusing structure has been successful developed by optimized design,to significantly improve the matching between the sheetelectron beamand the focusingmagnetic field so as to realize the long distance stable transport.The newly-developed PCM structure outperforms the conventional one in many ways,such as the improved-shape of the sheet electron beamwith much reduced fluctuations,and better constraint of the long distance stable transport.In addition,the optimized magnetic field distribution,generated by a solenoid in the focusing structure,is capable ofguiding the sheetelectron beammore effectively.The simulated results showthatthe electron beamtransmission efficiency overa distance of 89 mm,of the newly-developed PCMorthe solenoid magnetic field of 0.31 T, can be almost up to 100%.更多还原