Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
Ultramicroscopy. 2013 Apr;127:19-24. doi: 10.1016/j.ultramic.2012.07.011. Epub 2012 Jul 27.
The realization of high quality ultrashort pulsed beams requires ultrafast time-dependent electron optics. We present derivations of closed expressions both for the longitudinal and transverse focusing powers of resonant microwave TM010 cavities. The derived expressions are validated by particle tracking simulations using realistic cavity fields. For small field amplitudes, in which case the "weak lens" approximation holds, the focusing powers obtained from simulations are in good agreement with the derived expressions. Furthermore, the required phase and temperature stability for synchronization of electron bunches generated by femtosecond photoemission are discussed.
实现高质量的超短脉冲束需要超快的时变电子光学。我们给出了共振微波 TM010 腔的纵向和横向聚焦力的封闭表达式的推导。所推导的表达式通过使用实际腔场的粒子跟踪模拟进行了验证。对于小的场振幅（在这种情况下，“弱透镜”近似成立），从模拟中获得的聚焦力与推导的表达式非常吻合。此外，还讨论了用于同步飞秒光发射产生的电子束的相位和温度稳定性。
