4.6 Article

Toward High-Power Klystrons With RF Power Conversion Efficiency on the Order of 90%

Journal

IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume 62, Issue 10, Pages 3406-3412

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2015.2464096

Keywords

Design optimization; energy efficiency; klystrons; microwave amplifiers; particle accelerators; space charge

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The increase in efficiency of RF power generation for future large accelerators is considered a high priority issue. The vast majority of the existing commercial high-power RF klystrons operates in the electronic efficiency range between 40% and 55%. Only a few klystrons available on the market are capable of operating with 65% efficiency or above. In this paper, a new method to achieve 90% RF power conversion efficiency in a klystron amplifier is presented. The essential part of this method is a new bunching technique-bunching with bunch core oscillations. Computer simulations confirm that the RF production efficiency above 90% can be reached with this new bunching method. The results of a preliminary study of an L-band, 20-MW peak RF power multibeam klystron for Compact Linear Collider with the efficiency above 85% are presented.

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