It has been predicted (Rowe 1962) that the efficiency of a Travel1ing-Wave Tube should increase rapidly as the velocity of the beam-wave interaction approaches the velocity of light. For example at a velocity of 0.8 c, which is equivalent to a beam voltage of 370 kVf an efficiency of 70% should be obtainable. Fig. 1 shows a section of the pulsed travelling wave tube being built at S.E.R.L. which it is hoped will test this prediction.
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