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NRL has developed and demonstrated a unique sheet-beam electron gun, which produces a 3.5-4-A, 0.3 × 4 mm electron beam at ∼20 kV. This electron beam has been successfully used to power multi-kW amplifiers at both Ka and W bands. The devices developed thus far employ a permanent magnet solenoidal field of 6 – 8 kG to transport the electron beam through the interaction circuit. While a periodic permanent...
We present the first results of linearity measurements made on a Ka-band traveling-wave tube (TWT) driver-booster combination consisting of high power, broadband coupled-cavity TWT (CCTWT) cascaded with a folded-waveguide power booster TWT (FWTWT).
Key performance characteristics that guide the selection of an amplifier for various applications are gain, power, linearity, and efficiency. In this paper, these parameters are contrasted for two amplifier configurations: a single-beam amplifier with stages placed in series vs. a multi-beam amplifier with cascading stages. Based on MAGIC-3D simulations, while gain and efficiency are comparable, the...
We model the interaction between a planar electron beam and the transverse electromagnetic fields in a slow-wave structure. We summarize the linear theory of the coupled equations, including the space charge of the beam, and apply this to obtain the basic characteristics of the transverse interaction mechanism. We present results also using a non-linear theory, based on a number of simplifying assumptions...
Traveling-wave tubes (TWTs) based on the transverse interaction between an electron beam and a circularly polarized circuit wave were investigated starting in the 1960s. Small-signal theory based on a pencil beam suggested that these devices would have high efficiency and good linearity. Further analysis showed that the effect of a finite beam radius would limit these advantages. We present results...
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