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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...
A sheet-beam coupled-cavity traveling wave tube has produced over 10 kW of peak power at a center frequency of 34 GHz, with a 3-dB bandwidth of almost 5 GHz. The power of this amplifier is an order of magnitude higher than state-of-the-art conventional amplifiers of comparable frequency, bandwidth, and operating voltage (<20 kV). This unprecedented performance is made possible by a unique, NRL-developed...
NRL's unique sheet-beam electron gun, which produces a 3.5-4-A, 0.3×4 mm electron beam at ∼20 kV, has been successfully used to power multi-kW amplifiers at both Ka and W bands. The 94-GHz narrow-band EIK uses a 3-cavity circuit to produce a peak output power of over 7.5 kW, with saturated gain of ∼35 dB. The Ka-band amplifier uses a double staggered ladder coupled-cavity circuit to achieve a peak...
A W-band sheet-beam extended interaction klystron (EIK) has been fabricated and tested. The EIK integrates a 3-cavity circuit with our previously demonstrated 20-kV, 3.5-A beamstick. The EIK has produced a saturated peak output power of over 7.5 kW and a small-signal gain of almost 40 dB, in very good agreement with our simulations.
A W-band sheet-beam extended interaction klystron (EIK) is being fabricated and integrated with our previously demonstrated 19.5-kV, 3.3-A beamstick. The EIK is predicted by 3-D particle-in-cell simulations to have a saturated output power of almost 10 kW and a small-signal gain >40 dB. Key design features of the device will be reviewed, and the status of the fabrication and testing will be discussed.
A sheet-beam Extended Interaction Klystron (EIK) is being developed at W-band to demonstrate the enhanced power capability, compactness, and relatively high gain per unit length that have been predicted for the device. The EIK is powered by a 19.5-kV, 3.3-A sheet beam having dimensions of 0.32 mm × 4 mm. A beamstick for the device has achieved 98% current transport efficiency over a distance of 2...
A sheet-beam Extended Interaction Klystron (EIK) is an attractive MMW amplifier because of its enhanced power capability, compactness, and relatively high gain per unit length. However, an intrinsic problem with a sheet beam amplifier is its susceptibility to multimoding, which results because the width of the device is typically larger than a wavelength. Even in its ideal configuration, a sheet beam...
The stable transport of high-perveance, low-voltage sheet electron beams is a key requirement for the successful development of compact, high-power sheet beam amplifiers. We describe a beam stick to demonstrate the transport of such a beam (19.5 kV, 3.5 A) in a solenoidal magnetic field of about 8.5 kG. The beam stick consists of a novel sheet beam gun having single-plane convergence of a factor of...
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