Open AccessComparative research on three types of coaxial double-corrugation periodic slow-wave structures
Author(s) -
Ge Xing-Jun,
Huihuang Zhong,
Qian Bao-Liang,
Jun Zhang
Publication year - 2010
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.59.2645
Subject(s) - coaxial , physics , microwave , backward wave oscillator , optics , computational physics , pulsed power , dispersion relation , pulse duration , pulse (music) , voltage , acoustics , detector , telecommunications , computer science , laser , quantum mechanics , cathode ray , electron
The method for deducing expressions of arbitrary geometrical structures is studied in detail by using the Fourier series expansion. The dispersion curves of the slow-wave structures (SWSs) with the cosinoidalrapezoidal and rectangular corrugations are obtained by numerical calculation. Moreoverthe longitudinal resonance properties of the finite-length coaxial SWS are investigated with the S-parameter method. It is proposed that the introduction of a well designed coaxial extractor to slow-wave devices can help to reduce the period-number of the SWSwhich not only can make the devices more compactbut also can avoid the destructive competition between various longitudinal modes. Furthermorea compact L-band coaxial relativistic backward wave oscillator (RBWO) is investigated and optimized in detail with particle-in-cell (PIC) methods (KARAT code). In the preliminary experimentsthe measured microwave frequency is 161 GHzwith a peak power level of above 102 GWwhen the diode voltage is 670 kV and the current is 107 kA. The pulse duration (full-width at half-maximum) of the radiated microwave is 22 ns.