Military handbook

The electromagnetic properties of a ring-double-bar (RDB) slow wave structure are investigated. Use of two bars to connect neighboring rings instead of one as in a conventional ring-bar (RB) structure leads to the splitting $E$ - and $H$ -waves, with the $H$ -wave concentrated in thin layers near the rings. This effect leads to the flattening of the dispersion characteristic, similar to that in a helix with longitudinal vanes. Prototype RDB structures have been fabricated, measured, and compared with the conventional helix and RB circuits. Analysis, simulation, and cold test measurements demonstrate that the use of an RDB structure may make it possible to increase the maximum stable operating voltage of wideband traveling-wave tubes to 30–40 kV, enabling an order of magnitude increase in output power without the danger of backward wave oscillation.

Ring-Double-Bar Slow Wave Structure for High Power TWTs

: This report summarizes the accomplishments on a program to collect, study, and analyze reliability data and to develop models based on these data that can be used to predict the reliability of microwave tubes. The data were collected from the military services and various manufacturers for microwave tubes used in radar, communication and electronic counter measure systems. Included in the data were tubes from air, ground, and sea installations. The frequency range of the tubes in the data is 400 MHz through 16 GHz, and the peak output power of the tubes is generally over 100 watts. Reliability models were developed for 70 tube types which may be used to predict failure rates and removal criterion distributions. Additional reliability models were developed for klystrons, twystrons, magnetrons, traveling wave tubes, triodes and tetrodes which may be used to predict failure rates and removal criterion distributions based on operating parameters such as power, frequency and duty cycle. A methodology was developed to determine tubes requiring reliability improvement based expenditures required to replace failed tubes.

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High Power Microwave Tube Reliability Study

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High Power Microwave Tube Reliability Study