Very-high-power, hybrid microwave tube, combining the input section of a high-power klystron with the output section of a traveling wave tube, characterized by high operating efficiency and wide bandwidths.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a multicavity amplifier klystron in which the output section is replaced with a system of coupled resonators. In a Twystron, the electrons emitted by the cathode first pass through the klystron resonators, where they are grouped into bunches, as in a conventional klystron; they then pass through the system of coupled resonators, where they excite a traveling wave. Upon interaction with this wave, part of the kinetic energy of the electrons is converted into microwave energy, as in a conventional traveling-wave tube. The use of coupled resonators increases the operational frequency bandwidth to 7–15 percent of the mean frequency.

Twystrons provide the broadest bandwidths of all high-pulse-power microwave devices. They are manufactured for operation in the superhigh-frequency (microwave) band (wavelengths from 5 to 10 cm) and have pulse power ratings of 3–8 megawatts, gains of 35–50 decibels, and efficiencies of 35–40 percent. Twystrons were developed in the USA in the 1960’s by Varian Associates. They are used chiefly as transmitters in high-power radar installations on land and on board ships.


Karmazin, V. G., and V. S. Khabi. “Moshchnyi usilitel’nyi gibridnyi pribor O-tipa (tvistron).” Elektronnaia tekhnika, 1967, series 1, issue 11, pp. 149–51.
Staprans, A., E. McCune, and J. Ruetz. “SVCh elektrovakuumnye pribory bol’shoi moshchnosti s lineinym elektronnym puchkom.” Trudy Instituía inzhenerov po elektrotekhnike i radioelektronike, 1973. vol. 61, no. 3, pp. 52–88. (Translated from English.)


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Friedlander, "LSCEX3: A computer program for large signal analysis of klystrons, twystrons, and traveling wave tubes with cavity circuits," Varian Associates Report, Dec.
His interests include the development of very high power klystrons, twystrons, TWTs and gyrotrons.