A moderate-energy P-band relativistic backward wave oscillator (RBWO) is proposed and investigated by using the 2. 5D fully electromagnetic particle-in-cell code, KARAT. A double corrugated configuration is designed in the coaxial slow wave structure (SWS) of the moderate-energy P-band RBWO, and thus enlarges the temporal growth rate and the beam-wave interaction space of the RBWO, resulting in larger power capacity and shorter microwave output saturation time. The presented P-band RBWO has an increase of about two times compared with the conventional one in the radial range of the beam-wave interaction space, with almost the same period of SWS. The simulation results show that a microwave with the power of 267 MW, frequency of 867 MHz and efficiency of 30% is obtained with the diode voltage, diode current and guiding magnetic field of 300 kV, 3. 0 kA and 1.0T, respectively.%提出了一种新型的中等能量P波段相对论返波振荡器,该器件将慢波结构由低波段普遍采用的同轴外波纹结构变为同轴双波纹结构,使得径向束-波作用空间扩大了2倍,一定程度上增加了器件的功率容量；另外同轴双波纹结构还较大提高了器件的时间增长率,从而有效地减小了微波输出饱和时间.经优化设计,该结构在二极管电压300 kV、电流3 kA、导引磁场1.0T的情况下,获得267 MW的微波输出,效率达30％,频率为867 MHz.
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