Influence of thermal-insulation structure of thermionic cathode on oscillation efficiency of a sub-THz gyrotron
- Resource Type
- Conference
- Authors
- Yamaguchi, Yuusuke; Tatematsu, Yoshinori; Saito, Teruo
- Source
- 2016 41st International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz) Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2016 41st International Conference on. :1-2 Sep, 2016
- Subject
- Aerospace
Bioengineering
Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Engineered Materials, Dielectrics and Plasmas
Fields, Waves and Electromagnetics
Photonics and Electrooptics
Cathodes
Insulation
Electron beams
RF signals
Oscillators
Electric potential
Gyrotrons
- Language
- ISSN
- 2162-2035
Two types of thermionic cathodes were constructed to investigate the effect of thermal insulation gaps on the performance of a gyrotron. They were installed and tested in a 0.2-THz gyrotron, FU-CW-GIA. The simulation results have shown substantial deterioration in the electron beam quality and decreases in the output power in case of a cathode which has the thermal insulation gaps at the edge of the emitter. However, contrary to the numerical predictions, reductions in the power observed with that cathode were rather small under the optimized experimental conditions.