Analysis of Distributed-Emission Crossed-Field Amplifiers
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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Computer simulation has been used to aid in the development of the Raytheon QKS 1705 and QKS 1842 backward-wave distributed-emission crossed-field amplifiers. At present, Shared Applications, Inc. models a reentrant tube with a planar electrode configuration. The results give insight into the electron dynamics and show good qualitative agreement with measurements. Apparently no steady RF state exists instead the output power and anode current fluctuate by several percent over the transit time around the tube fifteen RF periods. To simulate a backward-wave amplifier with the planar model, it is necessary to supply an estimate of RF output power and derive the RF drive power. An alternative cylindrical model has demonstrated the ballistic starting mechanisms in the CFA. This model is capable of including the space-charge forces and the complete RF interaction in both forward- and backward-wave tubes and is recommended for further development.
- Electrical and Electronic Equipment