Shike Zhao

4.5: Recent results on a X-band 70W space traveling wave tube

X band TWT usually is used for satellite based data transmitting systems. Institute of electronics, Chinese academy of sciences has developed high efficiency X band space traveling wave tubes(TWT) with CW output power 70 watts.

Emission simulation and secondary electron emission measurement of the cathode in high-power continuous wave magnetron tubes

Energy and local distribution of electron around the cathode have been simulated in a 30kW continuous wave magnetron tube which operates in normal output power. According to the simulation results, it is clearly that the cathode of magnetron is bombed by low energy electrons mostly among 0 and 2keV. Based on the fact that most of the back bombardment electron belong to low energy electron, when the energy of incident electron is among 0 and 2keV, the secondary electron emission yield (SEEY) of cathodes provided with different mass percent Re doping W-Re alloy are measured, eventually, we obtain the maximum SEEY of W-Re alloy cathode when adopted by 5%Re doping.

An analysis on physical properties of refractory metals and alloys used as materials for TWT Helix

Several refractory metals and alloys, usually selected as traveling wave tube (TWT) helix materials, were briefly described in this paper, and then an analysis was presented in terms of thermal, electric and mechanical properties of these materials. It was pointed out that tungsten-rhenium alloys might be the most promising candidates for helix materials due to their combinative properties for high power and high reliability applications of traveling wave tubes.