STUDY OF HIGH POWER ELECTROSTATICALLY FOCUSED KLYSTRONS
Final rept. 1 May 1966-28 Aug 1967
LITTON SYSTEMS INC SAN CARLOS CA ELECTRON TUBE DIV
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The report covers a program of experimental study to establish the feasibility of employing higher perveance beams in ESFKs, which together with other broadband techniques filter, extended interaction cavity would lead to ten percent bandwidth. In order to keep the tube design as simple as possible, the program was undertaken only to study the feasibility of employing higher beam perveances in ESFKs. In addition to the experimental study, further theoretical studies were made on a triple-gap extended interaction cavity leading to a 1 MW peak power C-band klystron with ten percent bandwidth. Studies of beam power and perveance limits for ESFKs were made. An improved method was developed for calculating small-signal gain of ESFKs which accounts for the effect of the electrostatic field of the lens on the electron bunching process. During the program, one beam tester and one electrostatically focused klystron were built. By utilizing very low perveances 0.0000008 AV to the 32 power efficiencies of up to 43 percent were achieved. By increasing the perveance to 0.0000015 AV to the 32 power the efficiency dropped to 36 percent. Beam perveances higher than approximately 0.00000175 AV to the 32 power do not appear useful in ESFKs.
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