Abstract
We present the theoretical design and cold test of a 17 GHz photonic band gap (PBG) cavity with improved coupling from an external rectangular waveguide. The PBG cavity is made of a triangular lattice of metal rods with a defect (missing rod) in the center. The ${\mathrm{TM}}_{010}$-like defect mode was chosen as the operating mode. Experimental results are presented demonstrating that critical coupling into the cavity can be achieved by partial withdrawal or removal of some rods from the lattice, a result that agrees with simulations. A detailed design of the PBG accelerator structure is compared with a conventional (pillbox) cavity. One advantage of the PBG cavity is that its resonance frequency is much less perturbed by the input/output coupling structure than in a comparable pillbox cavity. The PBG structure is attractive for future accelerator applications.
Highlights
Photonic band gap (PBG) structures [1,2], typically built of periodic metallic and/or dielectric lattices, show tremendous potential for applications in guided wave optics — a field that employs the methods and techniques of microwave periodic structures for confinement, transmission, and transformation of coherent optical radiation
A cavity made of a 2D PBG structure of metal rods has been proposed as a candidate for an accelerator cell [6,7,8]
We focused on the problem of coupling into the PBG cavity, a critical issue for accelerator applications
Summary
We present the theoretical design and cold test of a 17 GHz photonic band gap (PBG) cavity with improved coupling from an external rectangular waveguide. The PBG cavity is made of a triangular lattice of metal rods with a defect (missing rod) in the center. The TM010-like defect mode was chosen as the operating mode. Experimental results are presented demonstrating that critical coupling into the cavity can be achieved by partial withdrawal or removal of some rods from the lattice, a result that agrees with simulations. A detailed design of the PBG accelerator structure is compared with a conventional (pillbox) cavity. One advantage of the PBG cavity is that its resonance frequency is much less perturbed by the input /output coupling structure than in a comparable pillbox cavity. The PBG structure is attractive for future accelerator applications
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