Application of the Balanced Hybrid Mode in Overmoded Corrugated Waveguides to Short Wavelength Dynamic Undulators.

摘要

Inspired by recent developments in low-loss overmoded components and systems for ultra-high power RF systems, we explored several overmoded waveguide systems that could function as RF undulators. One promising structure is a corrugated waveguide system operating at the balanced hybrid HE11 mode. This is a new application for that mode. Initial calculations indicate that such a system can be operated at relatively low power levels (approx. 50 MW) while obtaining large values for the undulator parameters K approx. 1. RF surface fields are typically low enough to permit superconducting operation. This technology can realize an undulator with short wavelengths and gives dynamic control of the undulator parameters including polarization. We introduce the scaling laws governing such structures, and establish the superiority of the balanced hybrid HE11 mode by comparative analysis. The scaling laws are verified through exact simulations. High quality factor of HE11 mode is demonstrated through measurements of a prototype design. Finally, a novel design is presented with low surface fields.