Microwave undulator using a helically corrugated waveguide

Zhang, Liang and He, Wenlong and Clarke, Jim and Ronald, Kevin and Phelps, Alan D.R. and Cross, Adrian W. (2018) Microwave undulator using a helically corrugated waveguide. IEEE Transactions on Electron Devices, 65 (12). pp. 5499-5504. ISSN 0018-9383

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    Abstract

    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.