Abstract
A pulsed L-band amplifier chain consisting of two crossed-field amplifiers operating in tandem will be described. The final tube of the chain gives an output of about \frac{3}{4} megawatt peak with an input of 100 kw peak. The driver tube gives an output of over 100 kw peak with an input of about 1 kilowatt peak. The duty cycle is .002 and bandwidth is 10%. Both of these tubes are representatives of a new dass of crossed-field amplifier which utilize forward wave interaction and a re-entrant electron stream. A forward wave circuit is obtained by a novel means of alternate capacitive coupling of half-wave length bars. Coaxial input and output lines are used to couple to the first and last bars of the circuit.
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