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L-3 Communications Electron Technologies (L-3 ETI) has recently tested a unit from the production family of Ku-band TWTs, the 88151HXR S/N 110, up to 200-W RF output power in thermal vacuum. Performance data and thermal analysis from the testing will be presented.
L-3 Communications Electron Technologies Inc., (L-3 ETI), continues to push the envelope for spacedownlink qualified mm-wave helix TWTs. We report results of high-power, wide bandwidth, and extreme environmental margin testing on the mm-wave family of helix TWTs from 22 GHz to 75 GHz.
Microfabricated sheet-beam traveling-wave tubes for THz and sub-THz operation have attracted a considerable interest. In this paper we discuss design issues of a double-vane slow-wave structure (SWS) for a 0.2 THz amplifier. A fast and accurate code for calculation of electrodynamic characteristics of the SWS is developed.
Latest production performance of L-3 ETI's millimeter wave helix TWTs is reported. L-3 ETI has delivered more than 830 units. The latest high power helix TWT, the 8926HA/B (500W Ka-band), demonstrates 98% test yield during the latter half of the current production. The 8921HP-2, 275 W Ka-band helix TWT demonstrated greater than 770 kHrs of field MTBF which is more than an order of magnitude higher...
A square cross section ring-bar slow-wave structure with straight-edge connections has been simulated with a cylindrical electron beam for application in a traveling-wave tube amplifier. An electric field probe has been designed for coupling between the square ring-bar and a WR-10 rectangular waveguide. The saturated output peak power varies from 9.1 W to 28.6 W over the frequency range of 90–98 GHz...
A novel three-dimensional finite-element (FE) modeling technique without matching meshes for the eigenmode analysis of arbitrary lossy slow-wave structures (SWSs) of traveling-wave tubes (TWTs) is presented. By simulating many examples, it is shown that the cold parameters of SWSs can be accurately and quickly obtained without matching meshes when using this technique. This technique would make the...
A modified slotted helix slow-wave structure is proposed to develop high-power, wide-bandwidth millimeter TWT. The electromagnetic characteristics are calculated by HFSS. The results show that the modified structure has higher interaction impedance and lower attenuation compared with original slotted helix SWS, which would lead to higher output power in millimeter-wave TWT.
L-3 Communications Electron Technologies Inc., (L-3 ETI), has completed space-flight qualification for a 160-W, radiation-cooled, X-band helix traveling-wave tube (TWT). This paper will discuss TWT performance, manufacturing and flight qualification test results.
The 2.5D large-signal code TESLA-FW was recently developed with the goal to model TWT amplifiers based on the serpentine or folded-waveguide slow-wave structures. Predictions of the large-signal code, applied to the modeling of the single stage amplifiers, were found in a good agreement with the results of the 3D PIC code MAGIC, while its run-time was on orders of magnitude less. To extend applicability...
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