强流相对论多注电子束在空心圆柱波导中的漂移

发布时间：2018-06-13 12:53

本文选题：强流多注电子束 + 镜像束流　；参考：《物理学报》2017年04期

【摘要】：建立了多注电子束在空心圆柱波导中传输的理论模型,定量分析了多注电子束自电磁场力与镜像电磁场力对其角向运动的影响,并推导了考虑镜像束流影响下多注电子束的布里渊磁场.开展了模拟仿真研究,模拟与理论计算结果基本一致.研究发现:当电子束注数较少且靠近波导管壁传输时,镜像电磁场力是影响多注电子束角向漂移的主要因素;随着电子束注数或电子束与波导壁间距的增加,镜像电磁场力迅速减小并趋近于零,此时自电磁场力起主导作用;在一般情况下,漂移角速度的变化百分比只与加速电压有关,与多注电子束的注数、空间位置关系等参数无关.在输出电压约670 kV,电流约7 kA,空心圆柱波导长约100 mm的平台上开展了实验研究,研究发现多注电子束存在明显的畸变,通过进一步的分析认为多注阴极柱的侧面发射是导致电子束畸变的一个主要因素,并且二极管加速区的角向漂移不可忽视.提出并模拟验证了采取倾斜多注阴极柱的方法可提高电子束的引入效率.
[Abstract]:A theoretical model for the propagation of multi-beam electron beams in hollow cylindrical waveguides is established. The effects of the self-electromagnetic force of multi-beam electron beam and the mirror electromagnetic field force on the angular motion of the multi-beam electron beam are quantitatively analyzed. The Brillouin magnetic field considering the effect of mirror beam is derived. The simulation results are in good agreement with the theoretical results. It is found that the mirror electromagnetic field force is the main factor affecting the angular drift of multi-beam electron beams when the number of electron beams is small and propagates close to the waveguide wall, with the increase of the number of electron beams or the distance between electron beams and waveguide walls. The mirror electromagnetic field force decreases rapidly and approaches to zero, in which the self-electromagnetic force plays a leading role. In general, the percentage of drift angular velocity variation is only related to the acceleration voltage, and to the number of multi-beam electron beams. The spatial position relation has nothing to do with other parameters. Experimental studies have been carried out on a platform with an output voltage of about 670 kV, a current of about 7 Ka and a hollow cylindrical waveguide about 100 mm in length. It is found that there is obvious distortion in the multi-beam electron beam. Through further analysis, it is considered that the side emission of the multi-beam cathode column is one of the main factors leading to the electron beam distortion, and the angular drift of the diode acceleration region can not be ignored. It is proved by simulation that the introduction efficiency of electron beam can be improved by using inclined multi-beam cathode column.
【作者单位】：中国工程物理研究院应用电子学研究所高功率微波技术重点实验室;中国工程物理研究院研究生院;
【基金】：国家自然科学基金(批准号:11475158) 中国物理研究院科学发展基金(批准号:2014B0402068)资助的课题~~
【分类号】：TN814

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