Microwave Undulator Using a Helically Corrugated Waveguide

Microwave undulators (MUs) can be an alternative to the permanent magnet undulators in a free-electron laser. 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 wa...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2018-12, Vol.65 (12), p.5499-5504
Main Authors: Zhang, Liang, He, Wenlong, Clarke, Jim, Ronald, Kevin, Phelps, Alan D. R., Cross, Adrian W.
Format: Article
Language:English
Subjects:
Cavity resonators
Corrugated waveguides
Electromagnetic fields
Electron beams
Field strength
Free electron lasers
Free-electron laser (FEL)
helically corrugated waveguide (HCW)
Masers
Microwave oscillators
microwave undulator (MU)
Permanent magnets
Standing waves
Supports
traveling wave mode
Traveling waves
Undulators
Waveguide lasers
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Summary:Microwave undulators (MUs) can be an alternative to the permanent magnet undulators in a free-electron laser. 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 TE 11 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.
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2018.2873726