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

Research output: Contribution to journalArticle


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.


  • Andrey Yu. Baikov
  • Chiara Marrelli
  • Igor Syratchev
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Accelerator Physics and Instrumentation


  • Design optimization, energy efficiency, klystrons, microwave amplifiers, particle accelerators, space charge
Original languageEnglish
Pages (from-to)3406-3412
JournalIEEE Transactions on Electron Devices
Issue number10
Publication statusPublished - 2015
Publication categoryResearch