Five-Stage Depressed Collector for High Efficiency Space TWTs

“High efficiency” is one among all other crucial requirements of a space TWT. There are many techniques previously reported for improving the collector efficiency namely, (i) increasing the number of stages
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, (ii) modifying the electric field by altering the geometry
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, (iii) introducing asymmetry either in electric or magnetic field
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, (iv) applying magnetic field within the collector. Although many such techniques are already well-documented, achieving high collector efficiency in a high electronic efficiency tube still remain a challenge. The main reason for this being the highly chaotic nature of the spent-beam electrons with wide velocity spread in a high electronic efficiency tube.