Abstract
In the present work, the MAGIC code is used to investigate the interactions between the electrons and the THz waves. In the study, two types of electron emission mechanisms are considered for comparisons. One is the field emission and the other is the explosive emission. The simulation results show that an electronic efficiency up to 4% can be achieved with no external magnetic fields applied. The field emission based vacuum device seems to be a good candidate for the interaction mechanism involved in the system, the energy distribution of the electrons throughout the interaction structure has been observed. The electrons emitted from the cathode surfaces are accelerated by the applied voltage, and are bunching and synchronizing with THz waves through the well-tailored metallic structures. In the MAGIC simulation, the output power and efficiency corresponding to the cases for the field emission and the explosive emission are calculated, respectively.
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