Design and cold testing of a radial extraction output cavity for a frequency-doubling gyroklystron

Karthik Bharathan, Wes Lawson, James Anderson, Emmanuel Steven Gouveia, Bart P. Hogan, Ivan Spassovsky

Research output: Contribution to journalArticle


Research in the University of Maryland at College Park's Gyroklystron (GKL) Project has recently centered around the development of a high-power high-gain frequency-doubling 17.136-GHz system. The current tube is a four-cavity (input, buncher, penultimate, and output) coaxial frequency-doubling system that will be used to drive a linear accelerator structure. This paper presents the design, simulation, optimization, cold test methodology, and performance data of a proposed radial extraction output cavity in which the microwave energy is extracted through an inner coaxial conductor in the TE01circular mode. The positioning of dielectrics in the drift spaces and the effect of axial and radial misalignments between the inner and outer walls of the cavity were studied in depth. One advantage of this topology is that it reduces the size and complexity of the output waveguide chain otherwise needed to convert the TE02circular mode from the GKL into the standard rectangular waveguide mode for injection into the Haimson Research Corporation accelerator structure. Cold test results show that this new cavity, which has a Q of 458 and a resonant frequency of 17.112 GHz, is a viable replacement for the output cavity currently in the system, as long as the cavity is well aligned. © 2006 IEEE.
Original languageEnglish
Pages (from-to)1301 - 1306
Number of pages6
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number4
Publication statusPublished - Apr 2006
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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