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 (https://doi.org/10.1109/TED.2018.2873726)

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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. The support of the STFC UK (Cockcroft Institute Core GrantR160525-1) is gratefully acknowledged. This work is supported by European Union (EU) Horizon 2020 Project “CompactLight” 2017-2021. “CompactLight” grant code: 777431-XLS. Published data 26 November 2018, under Self-archiving / 'green' OA.


Zhang, Liang ORCID logoORCID: https://orcid.org/0000-0002-6317-0395, He, Wenlong ORCID logoORCID: https://orcid.org/0000-0001-7018-0527, Clarke, Jim, Ronald, Kevin ORCID logoORCID: https://orcid.org/0000-0002-8585-0746, Phelps, Alan D. R. ORCID logoORCID: https://orcid.org/0000-0002-1100-1012 and Cross, Adrian W. ORCID logoORCID: https://orcid.org/0000-0001-7672-1283;