An electron beam with low normalized emittance, 2/spl pi/ mm mrad, has been achieved by using a microwave electron gun as the injector for an rf linac. However, cathode heating caused by back-bombarding electrons causes a ramp in the macropulse current. A transverse magnetic field can be applied at the cathode to reduce this effect. The simulation is an effort to find the optimum magnetic field.
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机译：通过使用微波电子枪作为rf直线加速器的注入器，已经获得了具有低归一化发射率的2 / spl pi / mm mrad的电子束。但是，由反轰击电子引起的阴极加热会引起大脉冲电流的倾斜。可以在阴极施加横向磁场以减小这种影响。该模拟是寻找最佳磁场的一种努力。
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