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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...
A 220 GHz traveling wave tube (TWT) is being developed in our lab. This TWT is based on a folded waveguide circuit with an electron beam focused by periodic permanent magnets (PPMs). To measure the transmission loss of the TWT directly, a prototype without a sever has been built. The maximum output power of this prototype is 1.1 W at 225 GHz. The gain, output power and transmission loss are close...
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.
In this continuous wave W-band TWT, a phase velocity step-tapering folded waveguide circuit was used instead of the uniform interaction circuit to improve the electron efficiency. The optimized pitch profile was proposed. The first prototype tube was assembled and tested. The output power in the 4GHz bandwidth of W-band was above 55W with about 15% overall efficiency.
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.
A traveling-wave tube (TWT) operating at 220 GHz with 10 W of output power and 10 GHz bandwidth is being developed. This paper reports the preliminary design and simulation of the electron gun, folded waveguide circuit and RF windows.
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