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Distributed coupling and multi-frequency microwave accelerators

United States Patent

July 5, 2016
View the Complete Patent at the US Patent & Trademark Office
SLAC National Accelerator Laboratory - Visit the Technology Transfer Website
A microwave circuit for a linear accelerator has multiple metallic cell sections, a pair of distribution waveguide manifolds, and a sequence of feed arms connecting the manifolds to the cell sections. The distribution waveguide manifolds are connected to the cell sections so that alternating pairs of cell sections are connected to opposite distribution waveguide manifolds. The distribution waveguide manifolds have concave modifications of their walls opposite the feed arms, and the feed arms have portions of two distinct widths. In some embodiments, the distribution waveguide manifolds are connected to the cell sections by two different types of junctions adapted to allow two frequency operation. The microwave circuit may be manufactured by making two quasi-identical parts, and joining the two parts to form the microwave circuit, thereby allowing for many manufacturing techniques including electron beam welding, and thereby allowing the use of un-annealled copper alloys, and hence greater tolerance to high gradient operation.
Tantawi; Sami G. (Stanford, CA), Li; Zenghai (Sunnyvale, CA), Borchard; Philipp (San Francisco, CA)
The Board of Trustees of the Leland Stanford Junior University (Palo Alto, CA)
14/ 795,490
July 9, 2015
STATEMENT OF GOVERNMENT SPONSORED SUPPORT This invention was made with Government support under grant (or contract) no. DE-AC02-76SF00515 awarded by the Department of Energy. The Government has certain rights in the invention.