磁场分布曲线对高功率回旋管磁控注入枪影响的分析
Analysis of the influence of the magnetic field profiles on the high-power gyrotron's magnetic injection gun
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摘要: 数值模拟了不同的磁场分布对回旋管磁控注入电子枪性能的影响。其中，共选择了3种电子枪区域的轴向磁场分布：正弦磁场、二次磁场和双曲正切磁场。由于前两类磁场在阴极区有一个恒定区域，故研究了此区域长度对电子枪性能的影响，找到使电子注具有较好性能的恒定区域的最佳长度；对于第三种磁场则研究了阴极区域磁场倾角对电子枪性能的影响，并找到了可以使电子注的速度比较大，而速度零散较小的稳定的最佳倾角分布区间。Abstract: In order to improve the performance of the magnetic injection gun(MIG),the beam has the mezzo velocity ratio between 1.5 and 2.0 and transvelocity spread lower than 5%.Three kinds of the magnetic field:the sin function magnetic field,the conic function one and the tanh function one, are discussed. Each kind of field distribution was changed and the simulation shows that:if sin or conic function field is used ,the beam performance can be improved by changing the flat region length,i.e.,moving the turning point near the end of the control anode ,then the velocity ratio will be maximum;if the tanh one is adopted ,and the field angle is in the range 9°to 70°,when the field angle increases,the velocity ratio increases as well as the trans velocity spread remains stable.
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