W-band TE{sub 01} gyrotron backward-wave oscillator with distributed loss

Journal Article · Tue Jul 15 04:00:00 EDT 2008 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2950305· OSTI ID:21268988

Chang, T H; Yu, C F ^[1]; Hung, C L ^[2]; Yeh, Y S; Hsiao, M C; Shin, Y Y ^[3]

---

1. Department of Physics, National Tsing Hua University, Hsinchu, 300, Taiwan (China)
2. Department of Communication Engineering, National Penghu University, Penghu, Taiwan (China)
3. Department of Electro-Optical Engineering, Southern Taiwan University, Tainan, Taiwan (China)

Distributed wall loss is proposed to enhance the stability and tunability of a W-band TE{sub 01} gyrotron backward-wave oscillator (gyro-BWO). Simulation results reveal that loss effectively suppresses the unwanted transverse modes as well as the high-order axial modes (HOAMs) without degrading the performance of a gyro-BWO that operates at the fundamental axial mode. Linear and nonlinear codes are used to calculate the interaction properties. The effects of the distributed loss on the starting currents of all of the modes of interest are discussed in depth. The interacting structure is optimized for stability. The calculated peak output power is 102 kW, corresponding to an efficiency of 20%. The 3 dB tuning bandwidth is 1.8 GHz, centered at 94.0 GHz when using 5 A and 100 kV electron beam.

• OSTI ID: 21268988
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 15; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ELECTRON BEAMS
LOSSES
MICROWAVE AMPLIFIERS
OSCILLATORS
SIMULATION
TUNING
WALLS