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An 0.22 THz sheet beam TWT amplifier is under development in the DARPA HiFIVE program. In our prior work, FDTD-PIC simulation predicted that the plasmonic band circuit of a staggered double grating array produces 150 to 275 W, corresponding to 3-5.5% efficiency, at 0.22 THz over ~30% bandwidth with greater than 12 dB/cm growth rate, assuming a beam power of 5 kW. Subsequent Ka-band dispersion and...
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