Open AccessInvestigation on an S-band relativistic klystron oscillator
Author(s) -
Huang Hua,
Gan Yanqing,
Lei Lurong,
Jin Xiao,
Ju Bing-Quan,
Xiang Fei,
Donghai Feng,
Zhong Liu
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.1765
Subject(s) - klystron , physics , microwave , backward wave oscillator , cathode ray , optics , effective radiated power , relativistic electron beam , bandwidth (computing) , electron , atomic physics , ka band , beam (structure) , magnetic field , modulation (music) , computational physics , nuclear physics , acoustics , quantum mechanics , telecommunications , radiation , computer science
The physics of modulation and rf extraction of an S-band relativistic klystron oscillator is studied in this paper via experiment, theory, and simulation. It is found that the intense relativistic electron beams (IREBs) can be intensely current-modulated when the IREBs drift through three pillboxes with high coupling. After bunching in the downstream the modulated IREBs can excite high-power microwave in the triaxial cavity. These properties, which have short oscillating time, compact geometry and high beam-wave conversion efficiency, were encouraging. Using a 1 MV, 13 kA, 40 ns electron beam and a 0.9 kGs leading magnetic field, 3.5 GW radiated power was extracted in 20 ns FWHM pulses at 2.86 GHz. The efficiency was 27%, and the instantaneous bandwidth was 2%. The radiated power was 3.4 GW when the repetition rate IREBs was 20 Hz. The experimental results agree well with the simulations.