Theoretical and experimental research on a high efficiency X-brand klystron-like RBWO

被引：11
作者：
Yang, Dewen [1 ]
Shi, Yanchao [1 ]
Xiao, Renzhen [1 ]
Teng, Yan [1 ]
Sun, Jun [1 ]
Chen, Changhua [1 ]
机构：
[1] Northwest Inst Nucl Technol, Sci & Technol High Power Microwave Lab, Xian 710024, Shaanxi, Peoples R China
来源：
AIP ADVANCES | 2018年 / 8卷 / 09期
关键词：
BACKWARD-WAVE OSCILLATOR; MODULATING RESONANT REFLECTOR; RELATIVISTIC ELECTRON-BEAM; GENERATION; PULSES; POWER; RADIATION;
D O I：
10.1063/1.5040075
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this paper, we study an X-band klystron-like relativistic backward wave oscillator (RBWO) with a pre-modulation cavity, modulation ridge, drift tube in the slow wave structure (SWS) and extraction cavity in both theoretical and experiment. PIC simulations show that the conversion efficiency can be up to 62% with output power of 3.0 GW. In experiment, when the diode voltage is 660 kV, and the diode current is 6.4 kA, the output power is 1.9 GW, and the conversion efficiency is 45%(+/- 5%). And we find that the conversion efficiency mainly suffers from the breakdown in the extraction cavity and the plasma from the cylindrical collector. To suppress the breakdown and plasma effect, the breakdown electric field threshold in RF structures(especially in the extraction cavity) had better be larger than 700 kV/cm. Moreover, the distance between the position where the electrons are collected and the end of extraction cavity should be larger than 20 mm in case of the cylindrical collector. (C) 2018 Author(s).
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页数：10
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