<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Chao-Hai Du</style></author><author><style face="normal" font="default" size="100%">Tsun-Hsu Chang</style></author><author><style face="normal" font="default" size="100%">Pu-Kun Liu</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Design of a W-band gyro-TWT amplifier with a lossy ceramic-loaded circuit</style></title><secondary-title><style face="normal" font="default" size="100%">IEEE Trans. Electron Devices</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2013</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6529134</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">60</style></volume><pages><style face="normal" font="default" size="100%">2388-2393</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;&lt;span&gt;A pulse prototype of a W-band TE&lt;/span&gt;&lt;span&gt;01&lt;/span&gt;&lt;span&gt;&amp;nbsp;mode gyrotron traveling-wave tube (gyro-TWT) amplifier is designed, and it features high gain and broadband capabilities. The TE&lt;/span&gt;&lt;span&gt;01&lt;/span&gt;&lt;span&gt;&amp;nbsp;mode input coupler is constructed by mounting a sapphire pill-box window onto a Y-type mode converter. The high power output window will employ a triple-sapphire-disc configuration to achieve return loss lower than -30 dB over a bandwidth of 8 GHz. To suppress the spurious oscillations and realize high-average power potential, a new lossy ceramic material with weak electric conductivity is loaded in the TE&lt;/span&gt;&lt;span&gt;01&lt;/span&gt;&lt;span&gt;&amp;nbsp;mode cylindrical interaction waveguide. The loss-free output taper is carefully optimized to suppress oscillations and maintain broadband amplification. Employing a magnetic injection gun of beam voltage 70 kV, beam current 3 A, pitch factor 1.5, and axial-velocity spread 5%, theoretical investigation predicts that the gyro-TWT amplifier is of excellent performance, which includes being driven to saturation with input power P&lt;/span&gt;&lt;span&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;&amp;lt;; 0.4 W, highest efficiency of 32.4%, and the bandwidth of 4.2 GHz with output power exceeding 50 kW.&lt;/span&gt;&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">7</style></issue></record></records></xml>