Comparison of five precision assembly methods for terahertz TWT electron gun’s cathode and gate electrode

This paper presented a multiple directions precision adjustment device, which was used for adjusting the coaxially of the travelling wave tube (TWT) electron gun’s cathode and gate electrode. The concentricity can meet the requirements only by rotating the three micrometer calipers. It can be quickly adjusted to 0.01 mm in 15 mins. The results are helpful to the following terahertz TWT, using a 17 kV, 71 mA electron beam, the measured peak power is over 60 watt and the average output power is over 12 watts with 20% duty cycle at the frequency around 0.22 THz.