Abstract
Extensive numerical analysis has resulted in the conclusion that the THz (H-band) sheet beam traveling wave tube (TWT) amplifier circuit, comprised of a staggered double grating array waveguide, has the very broad bandwidth (∼ 30 %) of the fundamental passband (TE-mode) with a 7 : 1 aspect ratio sheet beam without excitation of n = 1 space harmonic backward wave modes. Particle-in-cell (PIC) simulations utilizing MAGIC3D and CST PS predict that the designed circuit produces 150 ∼ 300 W output power, corresponding to ∼ 3–5.5 % intrinsic electronic efficiency (35 ∼ 38 dB gain from 50 mW input driving power), over ∼ 25 % bandwidth, which are in good agreement with Christine-1D code simulation results. Simulations, using a perfectly matched layer (PML) boundary (∼ −30 dB return loss), show the circuit stably operates without noticeable oscillation. With a more realistic matching condition with ∼ −9 dB return loss, it becomes unstable. However, simulations show that the incorporation of a sever with tapered conductivity fully suppresses the instability in tube operation.
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