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This paper describes the design and fabrication of an extremely thin-diamond window for terahertz traveling wave tubes. To reinforce the mechanical properties of the micro-crystalline diamond (MCD) incorporated with ultra-nano-crystalline diamond (UNCD), a 60 pm thick, seven-layered composite diamond film was fabricated. It was cut into window disks without lapping and polishing, which were then made...
In this paper, we report on the development of a prototype of 500W Ka-Band Helix TWTs. Based on the length and frequency of start oscillation calculated, a phase velocity taper is designed to suppress backward-wave oscillation and improve electronic efficiency of the TWT. The testing results show that this device is capable to deliver more than 500W (pulsed) power with a gain of 39dB over a bandwidth...
Compact traveling wave tubes (TWTs) operating at 220 GHz and 340 GHz respectively are being developed. The 220 GHz TWT is designed to produce 10 W output power and has achieved 0.2 W. The 340 GHz TWT is designed to produce 1 W output power and has not been demonstrated yet. This paper describes the development of the TWTs' components and some test results of two TWT prototypes.
A compact folded waveguide traveling-wave tube (TWT) with PPM system operating at 220 GHz with 10 W of output power and 10 GHz bandwidth is being developed. This paper reports the test results of the latest prototype.
A folded waveguide traveling-wave tube (TWT) with PPM system operating at 220 GHz with 10 W of output power and 10 GHz bandwidth is being developed. This paper reports the status of fabrication and test.
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