Dynamics of Axial Mode Competition in the Gyrotron Backward-Wave Oscillator
- Resource Type
- Conference
- Authors
- Pao, K. F.; Chang, T. H.; Fan, C. T.; Yu, C. F.; Chu, K. R.; Chen, S. H.
- Source
- IEEE Conference Record - Abstracts. 2005 IEEE International Conference on Plasma Science Plasma Science, 2005. ICOPS '05. IEEE Conference Record - Abstracts. IEEE International Conference on. :113-113 Jun, 2005
- Subject
- Engineered Materials, Dielectrics and Plasmas
Fields, Waves and Electromagnetics
Components, Circuits, Devices and Systems
Power, Energy and Industry Applications
Nuclear Engineering
Gyrotrons
Oscillators
Frequency
Chaos
Magnetic fields
K-band
Power generation
Physics education
Optical reflection
Voltage
- Language
- ISSN
- 0730-9244
Summary form only given. The dynamics of axial mode competition in the gyrotron backward-wave oscillator (gyro-BWO) has been investigated in theory and experiment. Because of the difference in field-shaping processes, the axial modes of the gyro-BWO each exhibit a distinctive asymmetry in field distribution along the axis. Multi-mode particle simulations reveal a consistent pattern of axial mode competition in which a fast-growing and well-established mode is subsequently suppressed by a slowly-growing mode with a favorable field profile. This is verified in a Ka-band gyro-BWO experiment. A detailed time-frequency analysis of both the simulation and experimental results further suggests that the competitiveness of a specific mode depends more on its field structure than on its initial growth rate. This perspective is expected to add a new basis for the understanding of mode competition phenomena in the gyro-BWO