Experimental research based on a C-band compact transit-time oscillator with a novel diode loading an embedded soft magnetic material and shielding structure
Yufang He(何宇放), Juntao He(贺军涛), Junpu Ling(令钧溥)†, Lei Wang(王蕾), and Lili Song(宋莉莉)
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
Abstract In order to reduce the external magnetic field and improve the conversion efficiency of high-power microwave generation devices with low external magnetic field, a novel diode with an embedded soft magnetic and shielding structure is proposed. The soft magnetic material is designed to enhance the local magnetic field in the diode region. Moreover, the diode applies a shielding structure which can reduce the radial electric field. From simulation research, it is found that the emission and transmission quality of the electron beam with low magnetic field is greatly improved when loading this diode. Through simulation research, it is verified that the diode can increase the conversion efficiency of the transit-time oscillator (TTO) from 30% to 36.7%. In our experimental study, under the conditions of a diode voltage of 540 kV and a current of 10.5 kA, the output microwave power is 1.51 GW when loading the novel diode and the microwave frequency is 4.27 GHz when an external guiding magnetic field of 0.3 T is applied. The corresponding conversion efficiency is improved from 20.0% to 26.6%, which is 6.6% higher than that of a device loaded with a conventional diode. Our experiments have verified that this novel diode can effectively improve the conversion efficiency of high-power microwave sources operating with low magnetic field, and contribute to the miniaturization and compactness of high-power microwave devices.
Received: 15 June 2022
Revised: 09 August 2022
Accepted manuscript online: 26 August 2022
PACS:
52.35.Fp
(Electrostatic waves and oscillations (e.g., ion-acoustic waves))
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61701516). We would like to show our deepest gratitude to the colleagues that offered us help in our research.
Yufang He(何宇放), Juntao He(贺军涛), Junpu Ling(令钧溥), Lei Wang(王蕾), and Lili Song(宋莉莉) Experimental research based on a C-band compact transit-time oscillator with a novel diode loading an embedded soft magnetic material and shielding structure 2023 Chin. Phys. B 32 075201
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