Microwave undulator using a helically corrugated waveguide

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Microwave undulators (MU) can be an alternative to the permanent magnet undulators in a free electron laser (FEL). MUs normally employ a cavity-type structure that supports the standing wave to boost the electromagnetic field strength. In this paper, a waveguide-type MU based on a helically corrugated waveguide (HCW) that supports a traveling wave is studied. The use of the HCW allows partial conversion of a traveling wave mode into a backward traveling wave mode, hence increasing the effective interaction length. When operating with a TE11 mode at 30.3 GHz, the MU was predicted to realize a field strength of ~0.3 T and an undulator period of 4.95 mm when driven by 1 GW of microwave power.
Original languageEnglish
Pages (from-to)5499-5504
Number of pages6
JournalIEEE Transactions on Electron Devices
Issue number12
Early online date16 Oct 2018
Publication statusPublished - 31 Dec 2018


  • microwave undulator
  • free electron laser
  • helically corrugated waveguide
  • traveling wave mode

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