Abstract
The design of compact, lightweight devices has become an important development direction of high-power microwave source devices, with the reduction of the external magnetic field being the leading innovation. By analyzing the transmission equation of the intense relativistic electron beam (IREB), it can be known that magnetic field strength in the diode region has great influence on the transmission quality of the IREB. In this paper, a new structure that introduces a soft magnetic material as the cathode base is proposed. Considering that soft magnetic materials have the capability to concentrate and enhance the magnetic field, the proposed structure leverages this merit to improve the magnetic field strength in the diode area under certain low external magnetic field conditions. Thus, the proposed structure is capable of effectively improving the emission and transmission quality of the IREB without any increase of the external guiding magnetic field. As for the device design, the new structure was introduced into a previously proposed C-band transit time oscillator, and the particle-in-cell simulation was carried out. The results showed that high power microwaves with a power of 2.7 GW are generated with a corresponding frequency of 40% when the electron beam voltage is 550 kV, the beam current is 12 kA, and the guiding magnetic field is 0.3 T.
Highlights
In the design and development of high-power microwave sources, the three aspects of high power, high efficiency, and miniaturization have gained significant importance in the recent past
The soft magnetic material is magnetized by the external magnetic field and provides additional axial magnetic field at the emitter end of the electron beam, improving the beam transmission quality
If the stainless steel is replaced with a soft magnetic material, a self-magnetic field will be generated when the material is magnetized scitation.org/journal/adv by the external magnetic field, thereby enhancing the magnetic field strength in the diode area
Summary
In the design and development of high-power microwave sources, the three aspects of high power, high efficiency, and miniaturization have gained significant importance in the recent past. Reducing the external guiding magnetic field allows for the miniaturization of the high-power microwave system and is one of the main research directions of high-power microwave sources. Since the transmission quality of intense relativistic electron beam (IREB) is closely related to the efficiency of beam wave conversion and is determined by the magnetic field strength, any effort to improve the transmission quality of IREB should consider reducing its working magnetic field further. In order to solve the problem of IREB transmission under low magnetic field configurations, the following two methods can be adopted: (1) increasing the radial dimension of the structure so as to reduce the relative thickness of the fluctuating ring electron beam and (2) adopting the appropriately distributed magnetic field configuration. The soft magnetic material is magnetized by the external magnetic field and provides additional axial magnetic field at the emitter end of the electron beam, improving the beam transmission quality
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
