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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%。
In order to improve the matching between the electron beam and the focusing magnetic field to realize long-distance stable transmission of the strip-shaped electrons, an optimized periodic raised magnetic field (PCM) focusing structure is proposed. Compared with the traditional PCM focusing structure, the optimized PCM structure improves the shape and transmission state of the electron beam, and can constrain the stable transmission of the band length in a long distance. Electron gun design Electron beam injection at 75 kV, 3.8 A, 10 mm × 0.5 mm is emitted from an elliptical cathode plane of 10 mm × 4 mm and compressed in a single direction. The drift channel is 89 mm long and has a horizontal cross-section of 12 mm × 0.8 mm. The results show that the period of the magnetic field is 12 mm and the peak value is 0.24 T; the maximum fluctuation amplitude of the electron injection in the height direction is 0.6 mm. At the same time, the focusing structure is also compatible with the focusing method of the package. The fluctuation of the magnetic field strength and the electronic injection in the height direction are 0.31 T and 0.5 mm respectively, and the beam passing rate is 100%.