Title :
Higher-order mode operation of a high-power gyrotron
Author_Institution :
Inst. of Photoelectron., Southwest Jiaotong Univ., Sichuan, China
Abstract :
A gyrokinetic analysis is presented to determine the influence of electron beam eccentricity on the power and starting current of a coaxial cavity gyrotron, which operates in a higher-order mode TE 31.17.1 with a frequency of 165 GHz. It is found that the starting current becomes larger because of the existence of the electron-beam eccentricity. Especially, the power is decreased substantially by electron beam eccentricity, for example, down to 93% of the power without any eccentricity even if the eccentricity is only 1% of the outer conductor radius. The acceptable range of electron beam voltage and operating magnetic field for the establishment of the electromagnetic oscillation is narrowed by electron-beam eccentricity.
Keywords :
electromagnetic oscillations; gyrotrons; millimetre wave tubes; relativistic electron beam tubes; starting; 165 GHz; TE/sub 31.17.1/ mode; coaxial cavity gyrotron; electromagnetic oscillation; electron beam eccentricity; electron beam voltage; gyrokinetic analysis; high-power gyrotron; higher-order mode operation; operating magnetic field; outer conductor radius; relativistic electron beam; starting current; Coaxial components; Conductors; Electromagnetic fields; Electron beams; Frequency; Gyrotrons; Magnetic analysis; Magnetic fields; Oscillators; Voltage;
Conference_Titel :
Microwave Conference, 2001. APMC 2001. 2001 Asia-Pacific
Conference_Location :
Taipei, Taiwan
Print_ISBN :
0-7803-7138-0
DOI :
10.1109/APMC.2001.985488
