Li Shuang, Wang Jianguo, Wang Dongyang
Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, P. O. Box 69-1, Xi'an, 710024, China.
Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an, 710049, China.
Sci Rep. 2020 Jan 15;10(1):336. doi: 10.1038/s41598-019-55525-9.
To increase the generation efficiency of the terahertz wave in the Y band, the idea of dual-reflector is introduced in the relativistic surface wave oscillator (SWO) with large oversized structures. The dual-reflector and the slow-wave structure (SWS) construct a resonator where the field strength of TM mode inside is intensively enhanced and then the efficiency is increased. The pre-modulation on electron beam caused by the reflector is also helpful in improving the output power. Meanwhile, the reflector can reduce the loss of negatively going electrons. Through the particle-in-cell (PIC) simulations, the optimized structure is tested to be stable and little power is transmitting back to the diode area. The output power reaches 138 MW in the perfectly electrical conductivity condition and the frequency is 337.7 GHz with a pure spectrum. The device's efficiency is increased from 10.7% to 16.2%, compared with the device without any reflectors. The performance of device with lossy material is also focused on. In the situation of copper device, the output power is about 41 MW under the same input conditions and the corresponding efficiency is about 4.8%.
为提高Y波段太赫兹波的产生效率，在具有大尺寸结构的相对论表面波振荡器（SWO）中引入了双反射器的概念。双反射器与慢波结构（SWS）构成一个谐振器，其中内部TM模式的场强得到强烈增强，进而提高了效率。反射器对电子束的预调制也有助于提高输出功率。同时，反射器可以减少反向运动电子的损失。通过粒子模拟（PIC），测试了优化后的结构是稳定的，并且很少有功率传输回二极管区域。在理想电导率条件下，输出功率达到138兆瓦，频率为337.7吉赫兹，频谱纯净。与没有任何反射器的器件相比，该器件的效率从10.7%提高到了16.2%。还研究了具有有损材料的器件的性能。在铜器件的情况下，在相同输入条件下输出功率约为41兆瓦，相应效率约为4.8%。
