Zhang Jun, Wang Haitao, Dang Fangchao, Qian Baoliang, Ge Xingjun, Chen Siyao, Lv Yankui
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, People's Republic of China.
National Key Laboratory of Science and Technology on Vessel Integrated Power System, Naval University of Engineering, Wuhan 430000, People's Republic of China.
Rev Sci Instrum. 2020 Oct 1;91(10):104701. doi: 10.1063/5.0012233.
Radial transit time oscillator (RTTO) can be relied on to generate effective coherent electromagnetic radiation in the millimeter wave domain. In this paper, the preliminary experimental research on a Ka-band RTTO is reported for the first time. In experiments, the radial electron beam emitted from the knife edge of the disk cathode is guided by the radial magnetic field. The bombardment trace on the nylon target verifies the emission and transportation uniformity of the radial e-beam. When the diode voltage is 410 kV, the beam current is 7.8 kA, and the magnetic field is 0.6 T, the RTTO can output microwaves with the power of 320 MW and the frequency of 31.35 GHz. As the diode voltage increases from 350 kV to 430 kV, the output microwave power will grow accordingly. Taking the ohmic loss into consideration, the experimental results are in agreement with the simulation ones.
径向渡越时间振荡器（RTTO）能够可靠地在毫米波波段产生有效的相干电磁辐射。本文首次报道了对Ka波段RTTO的初步实验研究。在实验中，从盘状阴极刃口发射的径向电子束由径向磁场引导。尼龙靶上的轰击痕迹验证了径向电子束的发射和传输均匀性。当二极管电压为410 kV、束流为7.8 kA、磁场为0.6 T时，RTTO能够输出功率为320 MW、频率为31.35 GHz的微波。随着二极管电压从350 kV增加到430 kV，输出微波功率也会相应增加。考虑到欧姆损耗，实验结果与模拟结果相符。
