Low Cost Crossed-Field Amplifier.
Interim technical rept. 10 Jun 75-31 Mar 76,
NORTHROP CORP DES PLAINES ILL
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This work is directed toward the achievement of a lower cost slow-wave structure for an injected-beam crossed-field amplifier IBCFA than has heretofore been possible. For cost reduction, the meander type of structure is to be supported on an ECOM design shaped dielectric substrate instead of individual insulator bars. The slow-wave structure designed and built simulates the configuration of the shaped substrate, but is built using conventional technology. In other respects, the design of the tube is similar to a production line IBCFA. Performance of the first experimental model is considered, in general, representative of the capability of this design. Power output of more than 3 kW peak and over 30 efficiency was achieved in the middle of the 2-4 GHz band, measured with 20 dB gain. Performance in the lower half of the band degraded slowly as frequency was reduced below 2.6 GHz, and degraded more rapidly as frequency was increased above 3.4 GHz. Substantial power and efficiency increases were observed for increased drive, indicating that a longer interaction space is desirable. Efficiency levels not far different from those at 3kW peak power output were observed at 1 kW, 2 kW and 4 kW peak power output by adjusting the magnetic field and the applied voltages. Author
- Electrical and Electronic Equipment